CA1128879A - Laminate structure for collapsible dispensing containers - Google Patents
Laminate structure for collapsible dispensing containersInfo
- Publication number
- CA1128879A CA1128879A CA365,010A CA365010A CA1128879A CA 1128879 A CA1128879 A CA 1128879A CA 365010 A CA365010 A CA 365010A CA 1128879 A CA1128879 A CA 1128879A
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- Canada
- Prior art keywords
- layer
- ethylene
- core film
- acrylic acid
- barrier layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Laminated Bodies (AREA)
Abstract
LAMINATE STRUCTURE FOR COLLAPSIBLE
DISPENSING CONTAINERS
Abstract of the Disclosure A collapsible dispensing container for packaging preparations containing hard-to-hold ingredients such as acetic acid. The container comprises a deformable tubular body and a thermoplastic head fused thereto. The wall of the tubular body is made of a plurality of laminations, including a sealant core film which prevents product migration and delamination. The wall of the tubular body comprises, from the inside of the tubular body toward the outside thereof, overlying layers of ethylene-acrylic acid copolymer, the sealant core film and an outer thermo-plastic (e.g., polyethylene) layer bonded to the outer layer of the sealant core film by another layer of ethylene-acrylic acid copolymer. The sealant core film comprises a metallic foil (e.g., aluminum) layer bonded to said inner ethylene-acrylic acid layer, an intermediate biaxially oriented corona treated polyester barrier layer bonded to said metal foil layer by a polyester adhesive layer or other suitable adhesive and an outer layer of ethylene-vinyl acetate or narrow molecular weight distribution (MWD) poly-ethylene bonded to the outer surface of said barrier layer by another polyester adhesive layer or other suitable adhesive. All layers are coextensively bonded to each other along their entire respective surfaces to insure against-product migration and delamination at the metal foil interface.
DISPENSING CONTAINERS
Abstract of the Disclosure A collapsible dispensing container for packaging preparations containing hard-to-hold ingredients such as acetic acid. The container comprises a deformable tubular body and a thermoplastic head fused thereto. The wall of the tubular body is made of a plurality of laminations, including a sealant core film which prevents product migration and delamination. The wall of the tubular body comprises, from the inside of the tubular body toward the outside thereof, overlying layers of ethylene-acrylic acid copolymer, the sealant core film and an outer thermo-plastic (e.g., polyethylene) layer bonded to the outer layer of the sealant core film by another layer of ethylene-acrylic acid copolymer. The sealant core film comprises a metallic foil (e.g., aluminum) layer bonded to said inner ethylene-acrylic acid layer, an intermediate biaxially oriented corona treated polyester barrier layer bonded to said metal foil layer by a polyester adhesive layer or other suitable adhesive and an outer layer of ethylene-vinyl acetate or narrow molecular weight distribution (MWD) poly-ethylene bonded to the outer surface of said barrier layer by another polyester adhesive layer or other suitable adhesive. All layers are coextensively bonded to each other along their entire respective surfaces to insure against-product migration and delamination at the metal foil interface.
Description
7~
1 Field of Invention: The present invention relates generallv to . I .
containers, and is particularly related to collapsible dispensing ! containers having a tubular body with laminated wall structure ,characterized by improved environmental stress crack resistance, j llimproved impact strength and resistance to delamination and im-perviouslless to certain hard-to-hold ing~edients, such as, for ,!example, acetic acid found in silicone caulking compounds and ,¦in other preparations.
I¦ This invention is also concerned with an improved Illaminated sheet for use in making tubular bodies of such collap-¦sible dispensing containers.
BACKGROUND OF I~ENTION
._ ¦ Collapsible dispensing containers have been widely used 1 for packaging various preparations. Metallic tubes were used in the past for packaging pharmaceutical products, cosmetics, toiletries and other preparations ~7hich contain volatile in-gredients since metals are impervious to oxygen, moisture and such volatile ingredients. However, metal tubes are costly to ~Iproduce due to high costs of the metals (usually aluminum or lead) ¦lused in making the tubes, and the manner in which the tubes must be made.
Plastic tubes have also been widely used in the past for packaging cosmetics and personal preparations such as sham-poos, etc. While plastic tubes are less costly to produce than metal tubes, and they are generally relatively inert ~o most chemicals, they are usually a poor barrrier to moisture, o~ygen and volatile ingredients such as essential oils, perfumes, mus-tard, dentifrices, medicinal ointments, shaving creams, etc.
. '.
37~a ;
i 1 . Attempts have heretofore been ~ade to extend the use of plastic tubes for packaging preparations which contain volatile I¦ ingredients by using ,a laminate structure which comprises a jl barrier layer of a metal foil (e.g., aluminum) laminated to a S I plastic (e,g., polyethylene), Tubes having such laminated wall construction combine the desirable properties of both plastics and metals and have found widespread commercial acceptance. One example of such tube is described in United States Patent No.
jj 3,264,410, issued to Roger Brandt and Ralph Kaercher on July 12, 1~ Ij 19~ which is owned by the assignee of this present application.
Il The laminated structure used in making the tubular body of the j~ collapsible dispensing container described in the aforementioned j patent comprises a metal foil barrier layer and a layer of a ¦ copolymer of olefin (e.g,, ethylene? and a polar group-containing 1~ I monomer (e.g., acrylic acid3, with the preferred copolymer being ¦l ethylene-acrylic acid copolymer, Il A further advance in the collapsible dispensing con-il tainer art is represented by United Sta~es Patent No. 3,347,419 ~1 issued to Roger Brandt and Nicholas Mestanas on October 17, 1967 I which is also assigned to the assignee of ~he present applicatlon.
The tubular body of the collapsible tube described in the latter patent is made of a laminated sheet comprising an intermediate . ¦ metal foil layer (e.g., aluminum) and an inner layer of a thermo-plastic polymer (e.g., polyethylene) which is adhesively bonded ~5 to the foil layer by means of a copolymer of olefin (e.g., ethyl-ene) and a polar group-containing monomer (e.g., acrylic acid).
Again, and as in the aforementioned United States Patent No.
4,41~, a copolymer of olefin and acrylic acid constitutes the Il !
I
~;
!~
~.8~7~
;
1 preferre~ adhesive copol~ner, The thermoplastic inner layer i,affords improved bonding between the tubular body and the head-piece of the container, which itself is usually made of poly-ethylene.
Other patents of interest in the collapsible dispensing l~ container art, and the laminate structures used in their construc-tion, are represented by United States Patent Nos. 3,172,~71 ! issued on March 9~ 1965 to Nicholas ~Iarchak; 3,295,725, issued on I January 3, 19~7 to Roger Brandt, and 3,505,143,issued to David lU ilHaas and Kurt Roesch on April 7, 1970, all of which are also ilassigned to the assignee of the present application.
I! While the laminated structures heretofore employed in ¦Imaking the tubular bo~ies of collapsible dispensing containers ¦leffectively prevent product migration through the tube and are excellent against attacks by oxygen, moisture, essential oils and other volatile comporlents of the contained products, they have not ,,shown the requisite resistance to attacks by certain other hard-to-j! hold ingredients of various prepara~ions. Thus, when preparations ¦¦which contain acetic acid are packaged in such containers, the acetic acid migrates toward the foil interface and causes delamina-,~tion of the foil.
It is accordingly an object~of this invention to provide a collapsible dispensing container which is uniquely suitable for packaging su~h hard-to-hold products.
~S It is also an object of this invention to provide an improved laminated structure for making the tubular bodies of such collapsible dispensing containers.
. -~l 88~
., , Ij 1 . It is a further object of this invention to provide a laminate structure characterized by improved stress crack resis-tance,improved impact strength, improved resistance to ~elamination ~ and imperviousness to acetic acid and preparations which contain S acetic acid.
¦¦ The foregoing and other advantages of this invention will become more apparent from thè following detailed description ~of its preferred embodiment and the accompany-~ng drawings.
l . . ,~
1~ I SUMMARY OF INVENTION
In accordance with this invention, a unique multiply i laminate is used to form the tubular body of a collapsible dis-pensing container d~signed to package certain hard-to-hold pre-parations containing acetic acid, such as, for example, silicone 1~ caulking compounds.
The ~aminated tubular body of the container comprises, from the inside of the container to its outside, overlying layers of ethylene-acrylic acid copolymer, a sealant core film and an outer thermoplastic (e.g., polyethylene) layer bonded to the ~O outer layer of the sealant core film by another layer of ethylene-acrylic acid copolymer.
The sealant core film comprises a metallic (e.g., . ~luminum) layer bonded to said inner ethylene-acrylic acid layer, ~n intermediate, biaxially oriented polyester barrier layer bonded ~5 to said metal foil by a polyester adhesive layer, and an outer ~thylene-vinyl acetate layer bonded to the outer surface of said ~arr$er layer by another polyester adhesive layer.
One surface of the polyester barrier layer is pre-reated with corona discharge to enhance adhesion thereto.
, _ 5 _ i_ , 1 ~RIXF Dl;SC~IPTIOM OF r~ DKA~7I~;GS
', Referring to the drawings, wherein llke reference nurner-als are used to designate like parts:
FIG, 1 is a side elevation view of a collapsible tube having a laminated wall structure made in accordance with this ¦ invention, ,l FIG. ~ is an enlarged section taken along the line 2-2 in FIG. 1 illustrating the component layers of the laminated wall structure of the collapsible tube; and FIG. 3 is a fragmentary enlarged sectional view of the sealant core film showing the layers thereof.
DESCRIPTION OF THE PREFERRED EMoeODI~IT
! OF T~E INVENTION
1~ Referring to FIG.lof the drawings J there is shown a collapsible dispensing tube generally designated as 1, having a ¦ tubular wall 3 which is heat sealed at its lower end 5. At its - I
upper end, the tubular wall 3 has a headpiece 7 which is usually I externally threaded so that an internally threaded cap 9 may be
1 Field of Invention: The present invention relates generallv to . I .
containers, and is particularly related to collapsible dispensing ! containers having a tubular body with laminated wall structure ,characterized by improved environmental stress crack resistance, j llimproved impact strength and resistance to delamination and im-perviouslless to certain hard-to-hold ing~edients, such as, for ,!example, acetic acid found in silicone caulking compounds and ,¦in other preparations.
I¦ This invention is also concerned with an improved Illaminated sheet for use in making tubular bodies of such collap-¦sible dispensing containers.
BACKGROUND OF I~ENTION
._ ¦ Collapsible dispensing containers have been widely used 1 for packaging various preparations. Metallic tubes were used in the past for packaging pharmaceutical products, cosmetics, toiletries and other preparations ~7hich contain volatile in-gredients since metals are impervious to oxygen, moisture and such volatile ingredients. However, metal tubes are costly to ~Iproduce due to high costs of the metals (usually aluminum or lead) ¦lused in making the tubes, and the manner in which the tubes must be made.
Plastic tubes have also been widely used in the past for packaging cosmetics and personal preparations such as sham-poos, etc. While plastic tubes are less costly to produce than metal tubes, and they are generally relatively inert ~o most chemicals, they are usually a poor barrrier to moisture, o~ygen and volatile ingredients such as essential oils, perfumes, mus-tard, dentifrices, medicinal ointments, shaving creams, etc.
. '.
37~a ;
i 1 . Attempts have heretofore been ~ade to extend the use of plastic tubes for packaging preparations which contain volatile I¦ ingredients by using ,a laminate structure which comprises a jl barrier layer of a metal foil (e.g., aluminum) laminated to a S I plastic (e,g., polyethylene), Tubes having such laminated wall construction combine the desirable properties of both plastics and metals and have found widespread commercial acceptance. One example of such tube is described in United States Patent No.
jj 3,264,410, issued to Roger Brandt and Ralph Kaercher on July 12, 1~ Ij 19~ which is owned by the assignee of this present application.
Il The laminated structure used in making the tubular body of the j~ collapsible dispensing container described in the aforementioned j patent comprises a metal foil barrier layer and a layer of a ¦ copolymer of olefin (e.g,, ethylene? and a polar group-containing 1~ I monomer (e.g., acrylic acid3, with the preferred copolymer being ¦l ethylene-acrylic acid copolymer, Il A further advance in the collapsible dispensing con-il tainer art is represented by United Sta~es Patent No. 3,347,419 ~1 issued to Roger Brandt and Nicholas Mestanas on October 17, 1967 I which is also assigned to the assignee of ~he present applicatlon.
The tubular body of the collapsible tube described in the latter patent is made of a laminated sheet comprising an intermediate . ¦ metal foil layer (e.g., aluminum) and an inner layer of a thermo-plastic polymer (e.g., polyethylene) which is adhesively bonded ~5 to the foil layer by means of a copolymer of olefin (e.g., ethyl-ene) and a polar group-containing monomer (e.g., acrylic acid).
Again, and as in the aforementioned United States Patent No.
4,41~, a copolymer of olefin and acrylic acid constitutes the Il !
I
~;
!~
~.8~7~
;
1 preferre~ adhesive copol~ner, The thermoplastic inner layer i,affords improved bonding between the tubular body and the head-piece of the container, which itself is usually made of poly-ethylene.
Other patents of interest in the collapsible dispensing l~ container art, and the laminate structures used in their construc-tion, are represented by United States Patent Nos. 3,172,~71 ! issued on March 9~ 1965 to Nicholas ~Iarchak; 3,295,725, issued on I January 3, 19~7 to Roger Brandt, and 3,505,143,issued to David lU ilHaas and Kurt Roesch on April 7, 1970, all of which are also ilassigned to the assignee of the present application.
I! While the laminated structures heretofore employed in ¦Imaking the tubular bo~ies of collapsible dispensing containers ¦leffectively prevent product migration through the tube and are excellent against attacks by oxygen, moisture, essential oils and other volatile comporlents of the contained products, they have not ,,shown the requisite resistance to attacks by certain other hard-to-j! hold ingredients of various prepara~ions. Thus, when preparations ¦¦which contain acetic acid are packaged in such containers, the acetic acid migrates toward the foil interface and causes delamina-,~tion of the foil.
It is accordingly an object~of this invention to provide a collapsible dispensing container which is uniquely suitable for packaging su~h hard-to-hold products.
~S It is also an object of this invention to provide an improved laminated structure for making the tubular bodies of such collapsible dispensing containers.
. -~l 88~
., , Ij 1 . It is a further object of this invention to provide a laminate structure characterized by improved stress crack resis-tance,improved impact strength, improved resistance to ~elamination ~ and imperviousness to acetic acid and preparations which contain S acetic acid.
¦¦ The foregoing and other advantages of this invention will become more apparent from thè following detailed description ~of its preferred embodiment and the accompany-~ng drawings.
l . . ,~
1~ I SUMMARY OF INVENTION
In accordance with this invention, a unique multiply i laminate is used to form the tubular body of a collapsible dis-pensing container d~signed to package certain hard-to-hold pre-parations containing acetic acid, such as, for example, silicone 1~ caulking compounds.
The ~aminated tubular body of the container comprises, from the inside of the container to its outside, overlying layers of ethylene-acrylic acid copolymer, a sealant core film and an outer thermoplastic (e.g., polyethylene) layer bonded to the ~O outer layer of the sealant core film by another layer of ethylene-acrylic acid copolymer.
The sealant core film comprises a metallic (e.g., . ~luminum) layer bonded to said inner ethylene-acrylic acid layer, ~n intermediate, biaxially oriented polyester barrier layer bonded ~5 to said metal foil by a polyester adhesive layer, and an outer ~thylene-vinyl acetate layer bonded to the outer surface of said ~arr$er layer by another polyester adhesive layer.
One surface of the polyester barrier layer is pre-reated with corona discharge to enhance adhesion thereto.
, _ 5 _ i_ , 1 ~RIXF Dl;SC~IPTIOM OF r~ DKA~7I~;GS
', Referring to the drawings, wherein llke reference nurner-als are used to designate like parts:
FIG, 1 is a side elevation view of a collapsible tube having a laminated wall structure made in accordance with this ¦ invention, ,l FIG. ~ is an enlarged section taken along the line 2-2 in FIG. 1 illustrating the component layers of the laminated wall structure of the collapsible tube; and FIG. 3 is a fragmentary enlarged sectional view of the sealant core film showing the layers thereof.
DESCRIPTION OF THE PREFERRED EMoeODI~IT
! OF T~E INVENTION
1~ Referring to FIG.lof the drawings J there is shown a collapsible dispensing tube generally designated as 1, having a ¦ tubular wall 3 which is heat sealed at its lower end 5. At its - I
upper end, the tubular wall 3 has a headpiece 7 which is usually I externally threaded so that an internally threaded cap 9 may be
2~ ¦ secured thereto after the tube 1 is filled with product 11. The 1I tubul~r wall 3 comprises a laminated sheet 13 which is usually I rolled into tube form and joined in a side seam ~not shown) at the edges of the laminated sheet.
The laminated sheet 13 of the tubular body comprises a plurality of layers laminated or otherwise bonded to each other to provide a laminated wall structure which is impervious to the hard-to-hold products, while exhibiting improved environmental stress c- ck, resistance to delar nation and improved impact 2~7~ , 'I
1reslstance required for high viscosity products such as silicone l caulks. Thus, as illustrated in FIG. 2, the laminated sheet 13 of the tubular wall 3 comprises a laminated sealant core film 15 ! adhesively laminated to an outer thermoplastic polymer layer 17 jl such as a layer of medium density polyethylene (MDPE) by an i~ intermediate layer 1~3 made of a copolymer of ethylene with ¦ acrylic acid. Interiorly, and on the product side, the laminated sheet 13 comprises an i~mer layer 21 of copolymer of ethylene-¦ acrylic copolymer which is bonded to the sealan~ core 15 as will 1~ ! hereinafter be described The inclusion of ethylene-acrylic acid copolymer layers 19 and 21 also serve the dual functions o im-parting resistaIlce to environmental stress cracking and providing the rough matte finish required in such tubes.
l Optionally, the polyethylene layer 17 may be pigmented lS I for opacity and color, and a layer of printed data may be applied thereon if desired. The provision of such layer, however, is not strictly necessary.
¦ The inclusion of the sealant core film 15 in the ¦ laminated sheet 13 of the tubular body 3 affords increased ~O I protection against delamina~ion caused by the acetic acid in-gredient of silicone caulking compounds and other acetic acid-containing products which are packaged in the dispensing tubes ; made in accordance with this invention. The sealant core film 15, as is best illustrated in FIG. 3, comprises a metal foil layer 23 which is typically an aluminum foil, and further includes a bar-rier layer 25 designed to prevent acetic acid migration toward ~he metal foil interface. Biaxially oriented poly(ethylene terephtha-late) film, a polyester, constitutes the barrier layer of choice ., ~ 7~7~ ~
forlhe purpose of this inventi)n. Olle sur:face of the I~oLycslcr layer is -treated with corona li.scllarye to improve adhesion. rr}-e co:Lolla d;.scharge tre.ited polycstcr l~arri(r layer ?5; 5 ad]csivcly l?olld(cl ~o ~ e alum;.ll~m :~oil 23 ~hrou(~h an dlles;ve ]aycr 27 Lo l~c hercil~ Clcr de:~ined.
Lhc s(al.ant ( )~e fi.l.m :L5 ~urtllcr i.nc]ucles an outer ilcat sealab]e l.ayer 29 ;uch as a ].aycr o.~ narrow molecul.ar ~ciyht dis--tr;but;on polye-thy].ene of tlle type manu~actured by the Du ~ont Cornpany under the trîdcma.r:k Scll:ir , or a layer of ctllylene-vinyl aceta-te copolymer in ~-~hich, preferahly, the copolymerized vinyl acetate cons-titutes from a~out 3.5 to about 30 ~7eight per-cent oE tl^~2 copolyrner. The hea-t sr_a:l.ab].e layer 29 ;mparts aldi---t;onal envirollmental strcss crack resistince to t}-e tube ~.7al1.
Illteriorly, -Ihe hea-t s~alabl.e ]ayer 29 .is .d]lcsively bonded to the b.arrier .l.ayer 25 Illrolly}l an a(llle:.ive layer 31, a!ld exteriorly. rhe ]~arri.er l.ayer 25 is adhcsively l~on~ed -Io the f.oil layer 23 tllrolgh an adh?s;.~e layer 27 as s]lo~;n i.n Fig. I:tI.
The aclllesi~7e ]-yers 27 al~d 31 are thcrlilosetting adllcsi es such as, ror e~ample, a t~o colnponellt polyester-l~ased adhcsi~e res;.n tyl>ical].y llsed :Eor fle~ihle adh(-sive larrlinat.lolls to treated or untrcated poly ster l.i.lm. SliCh pol..ye t:cr ad]l s.iv- consists of a poly~s-ter-based resi.n w;.th a toluelle diisocyallate (TDI) ca-talyst which reac-t to ~or.m a polyester l~a~ed uretlla~le ad}lcsive.
Other tllernlosetti.ny adh(sives ialcl-ide poly(-tller ul.cthlne type ad-llcsives and po]yctnylene;.mille (Pl[) i - 8 -~ ~L2.~
. . .
l i . Thus, and as it is evident from the foreg(~ g description, the laminated sheet 13 comprises a plur~lity of ~! overlying bonded layer uniquely selected to provide l.he requisite Iyrotection against acetic acid and other hard-to-hol~ ingredients ! of certain packaged materials such as silicone caulki.ng compounds.
The co~posite sheet 13 may be made of relatively small ithickness while still retaining the structural integrity and jthe other aforementioned desired attributes of the tube wall.
il In making the laminate sheet 13, the sealant core 1~ Ifilm l~ is first made by adhesively bonding the aluminum foil 23 to the barrier layer 25 using the first polyester adhesive layer 27. The barrier layer 25 is also bonded along the inner surface to the layer 29 of ethylene vinyl acetate copolymer or a l narrow molecular weight distribution polyethylene, using the lj second polyester adhesive layer 31 similar to the polyester adhesive layer 27, or any other suitable adhesive;
The sealant core film lS thus made is then extrusion I laminated to the outer thermoplastic (MDPE) layer 17 through I~an intermediate ethylene-acrylic acid copolymer layer 19.
1 Interiorly, and on the product side, the extrusion laminated . sealant core l~ is coated with the overlying layer o~ ethylene-acrylic acid copol~Jmer layer 21 to complete the laminate sheet ~3 structure.
The aforementioned layers of the l~minated sheet 13 ~S are generally coextensive and are bonded to each other along their entire respective surfaces to insure against delamination and product migration to the foil interface.
1 Once the lamirlated sheet 13 is made, it may be formed ! into a tube for making the dispensible containers. The tubes ¦¦may be formed using conventional methods and equipment as Illdescribed, for example, in the aforementioned commonly assigned
The laminated sheet 13 of the tubular body comprises a plurality of layers laminated or otherwise bonded to each other to provide a laminated wall structure which is impervious to the hard-to-hold products, while exhibiting improved environmental stress c- ck, resistance to delar nation and improved impact 2~7~ , 'I
1reslstance required for high viscosity products such as silicone l caulks. Thus, as illustrated in FIG. 2, the laminated sheet 13 of the tubular wall 3 comprises a laminated sealant core film 15 ! adhesively laminated to an outer thermoplastic polymer layer 17 jl such as a layer of medium density polyethylene (MDPE) by an i~ intermediate layer 1~3 made of a copolymer of ethylene with ¦ acrylic acid. Interiorly, and on the product side, the laminated sheet 13 comprises an i~mer layer 21 of copolymer of ethylene-¦ acrylic copolymer which is bonded to the sealan~ core 15 as will 1~ ! hereinafter be described The inclusion of ethylene-acrylic acid copolymer layers 19 and 21 also serve the dual functions o im-parting resistaIlce to environmental stress cracking and providing the rough matte finish required in such tubes.
l Optionally, the polyethylene layer 17 may be pigmented lS I for opacity and color, and a layer of printed data may be applied thereon if desired. The provision of such layer, however, is not strictly necessary.
¦ The inclusion of the sealant core film 15 in the ¦ laminated sheet 13 of the tubular body 3 affords increased ~O I protection against delamina~ion caused by the acetic acid in-gredient of silicone caulking compounds and other acetic acid-containing products which are packaged in the dispensing tubes ; made in accordance with this invention. The sealant core film 15, as is best illustrated in FIG. 3, comprises a metal foil layer 23 which is typically an aluminum foil, and further includes a bar-rier layer 25 designed to prevent acetic acid migration toward ~he metal foil interface. Biaxially oriented poly(ethylene terephtha-late) film, a polyester, constitutes the barrier layer of choice ., ~ 7~7~ ~
forlhe purpose of this inventi)n. Olle sur:face of the I~oLycslcr layer is -treated with corona li.scllarye to improve adhesion. rr}-e co:Lolla d;.scharge tre.ited polycstcr l~arri(r layer ?5; 5 ad]csivcly l?olld(cl ~o ~ e alum;.ll~m :~oil 23 ~hrou(~h an dlles;ve ]aycr 27 Lo l~c hercil~ Clcr de:~ined.
Lhc s(al.ant ( )~e fi.l.m :L5 ~urtllcr i.nc]ucles an outer ilcat sealab]e l.ayer 29 ;uch as a ].aycr o.~ narrow molecul.ar ~ciyht dis--tr;but;on polye-thy].ene of tlle type manu~actured by the Du ~ont Cornpany under the trîdcma.r:k Scll:ir , or a layer of ctllylene-vinyl aceta-te copolymer in ~-~hich, preferahly, the copolymerized vinyl acetate cons-titutes from a~out 3.5 to about 30 ~7eight per-cent oE tl^~2 copolyrner. The hea-t sr_a:l.ab].e layer 29 ;mparts aldi---t;onal envirollmental strcss crack resistince to t}-e tube ~.7al1.
Illteriorly, -Ihe hea-t s~alabl.e ]ayer 29 .is .d]lcsively bonded to the b.arrier .l.ayer 25 Illrolly}l an a(llle:.ive layer 31, a!ld exteriorly. rhe ]~arri.er l.ayer 25 is adhcsively l~on~ed -Io the f.oil layer 23 tllrolgh an adh?s;.~e layer 27 as s]lo~;n i.n Fig. I:tI.
The aclllesi~7e ]-yers 27 al~d 31 are thcrlilosetting adllcsi es such as, ror e~ample, a t~o colnponellt polyester-l~ased adhcsi~e res;.n tyl>ical].y llsed :Eor fle~ihle adh(-sive larrlinat.lolls to treated or untrcated poly ster l.i.lm. SliCh pol..ye t:cr ad]l s.iv- consists of a poly~s-ter-based resi.n w;.th a toluelle diisocyallate (TDI) ca-talyst which reac-t to ~or.m a polyester l~a~ed uretlla~le ad}lcsive.
Other tllernlosetti.ny adh(sives ialcl-ide poly(-tller ul.cthlne type ad-llcsives and po]yctnylene;.mille (Pl[) i - 8 -~ ~L2.~
. . .
l i . Thus, and as it is evident from the foreg(~ g description, the laminated sheet 13 comprises a plur~lity of ~! overlying bonded layer uniquely selected to provide l.he requisite Iyrotection against acetic acid and other hard-to-hol~ ingredients ! of certain packaged materials such as silicone caulki.ng compounds.
The co~posite sheet 13 may be made of relatively small ithickness while still retaining the structural integrity and jthe other aforementioned desired attributes of the tube wall.
il In making the laminate sheet 13, the sealant core 1~ Ifilm l~ is first made by adhesively bonding the aluminum foil 23 to the barrier layer 25 using the first polyester adhesive layer 27. The barrier layer 25 is also bonded along the inner surface to the layer 29 of ethylene vinyl acetate copolymer or a l narrow molecular weight distribution polyethylene, using the lj second polyester adhesive layer 31 similar to the polyester adhesive layer 27, or any other suitable adhesive;
The sealant core film lS thus made is then extrusion I laminated to the outer thermoplastic (MDPE) layer 17 through I~an intermediate ethylene-acrylic acid copolymer layer 19.
1 Interiorly, and on the product side, the extrusion laminated . sealant core l~ is coated with the overlying layer o~ ethylene-acrylic acid copol~Jmer layer 21 to complete the laminate sheet ~3 structure.
The aforementioned layers of the l~minated sheet 13 ~S are generally coextensive and are bonded to each other along their entire respective surfaces to insure against delamination and product migration to the foil interface.
1 Once the lamirlated sheet 13 is made, it may be formed ! into a tube for making the dispensible containers. The tubes ¦¦may be formed using conventional methods and equipment as Illdescribed, for example, in the aforementioned commonly assigned
3 1l patent of Nicholas Marcha~.
I While the laminated structure of this invention has heretofore been described with a certain degree of particularity, several modifications may be made therein. For example, additional lland decorative layers ~ay be included in the composite layers i without altering the basic properties of the laminated sheet 13 ¦ or the tubular bodies made therefrom. Such modifications, however, are obvious from the present disclosure, and therefor, they ! are within the scope and contemplation of this invention.
I While the laminated structure of this invention has heretofore been described with a certain degree of particularity, several modifications may be made therein. For example, additional lland decorative layers ~ay be included in the composite layers i without altering the basic properties of the laminated sheet 13 ¦ or the tubular bodies made therefrom. Such modifications, however, are obvious from the present disclosure, and therefor, they ! are within the scope and contemplation of this invention.
Claims (24)
1. A collapsible dispensing container having a tubular body and a thermoplastic head fused thereto, said tubular body having a plurality of laminations, including a sealant core film, a first overlying layer of ethylene-acrylic acid copolymer on the product side of said sealant core film, an outer overlying thermo-plastic polymer layer and a second layer of ethylene-acrylic acid copolymer for adhesively bonding the outer side of said sealant core film to said outer thermoplastic polymer layer; said sealant core film comprising a metallic foil layer secured to said first ethylene-acrylic acid copolymer layer, an intermediate polyester barrier layer bonded to said metal foil layer by an adhesive layer and an outer heat sealable polymer layer bonded to the outer surface of said barrier layer by a second adhesive layer.
2. A dispensing container as in claim 1 wherein said outer thermoplastic layer of the tubular body is polyethylene.
3. A dispensing container as in claim 1 wherein said metal foil is aluminum.
4. A dispensing container as in claim 2 wherein said metal foil is aluminum.
5. A dispensing container as in claim 1 wherein said outer heat sealable layer is ethylene-vinyl acetate copolymer.
6. A dispensing container as in claim 2 wherein said outer heat sealable layer is ethylene-vinyl acetate copolymer.
7. A dispensing container as in claim 3 wherein said outer heat sealable layer is ethylene-vinyl acetate copolymer.
8, A dispensing container as in claim 4 wherein said outer heat sealable layer is ethylene-vinyl acetate copolymer.
9. A multiply laminate for making tubular walls for collapsible dispensing containers, said laminate comprising a sealant core film, a first layer of ethylene-acrylic acid copolymer overlying one side of said sealant core film, a second layer of ethylene-acrylic acid overlying the other side of said sealant core film and an outer layer of a thermoplastic polymer layer overlying said second ethylene-acrylic acid copolymer layer; said sealant core film comprising a metallic foil layer bonded to said first ethylene-acrylic acid layer, an intermediate polyester barrier layer bonded to said metal foil layer, a first adhesive layer for bonding said metal foil layer to one side of said polyester barrier layer, an outer heat sealable layer and a second adhesive layer for bonding the other side of said poly-ester barrier layer to said heat sealable layer vinyl acetate layer
10. A multiply laminate as in claim 9 wherein said outer thermoplastic layer of the tubular body is polyethylene.
11. A multiply laminate as in claim 9 wherein said metal foil is aluminum.
12. A multiply laminate as in claim 10 wherein said metal foil is aluminum.
13. A multiply laminate as in claim 9 wherein said outer heat sealable layer is ethylene-vinyl acetate copolymer.
14. A multiply laminate as in claim 10 wherein said outer eat sealable layer is ethylene-vinyl acetate copolymer.
15. A multiply laminate as in claim 11 wherein said outer seat sealable layer is ethylene-vinyl acetate copolymer.
16. A multiply laminate as in claim 12 wherein said outer heat sealable layer is ethylene-vinyl acetate copolymer.
17. A collapsible container as in claim 1 wherein said polyester barrier layer is biaxially oriented.
18. A collapsible container as in claim 2 wherein said polyester barrier layer is biaxially oriented.
19. A collapsible container as in claim 3 wherein said polyester barrier layer is biaxially oriented.
20. A collapsible container as in claim 4 wherein said polyester barrier layer is biaxially oriented.
21. A multiply laminate as in claim 9 wherein said polyester barrier layer is biaxially oriented.
22. A multiply laminate as in claim 10 wherein said polyester barrier layer is biaxially oriented.
23. A multiply laminate as in claim 11 wherein said polyester barrier layer is biaxially oriented.
24. A multiply laminate as in claim 12 wherein said polyester barrier layer is biaxially oriented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA365,010A CA1128879A (en) | 1980-11-19 | 1980-11-19 | Laminate structure for collapsible dispensing containers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA365,010A CA1128879A (en) | 1980-11-19 | 1980-11-19 | Laminate structure for collapsible dispensing containers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1128879A true CA1128879A (en) | 1982-08-03 |
Family
ID=4118494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA365,010A Expired CA1128879A (en) | 1980-11-19 | 1980-11-19 | Laminate structure for collapsible dispensing containers |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1128879A (en) |
-
1980
- 1980-11-19 CA CA365,010A patent/CA1128879A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |