DE1545040A1 - Blade cover for razor blades and process for producing the coating substance and for applying it to the razor blades - Google Patents

Description

Tο η d e ο -Werk Adolf Nο s s in Solingen-Auf the height .

Blade cover "for razor blades and processes for Manufacture of the coating substance and its application on the razor blades.

The invention relates to a cutting edge cover for safety razor blades for improvement their shaving properties or razor blades with a cutting edge coating for this purpose, as well as a process for preparing the coating substance and for applying it to the razor blades.

Substances are already known

which applied to razor blades, a more pleasant one Allow shaving. Such substances are, for example, polytetrafluoroethylene and crosslinked polysiloxanes. However, polytetrafluoroethylene effective in this regard can only pass through stainless chrome steel blades complex and expensive processes, applied at high temperatures in pure nitrogen or argon atmosphere will. Polysiloxanes serving the same purpose must be carefully maintained at temperatures and Times on the blades are networked, which requires a greater amount of equipment. By the proportionate high temperature stress on blades treated with polytetrafluoroethylene is a A drop in hardness cannot be avoided.

A new class of substances has now been found which can be found on blades of all types at room temperature can be applied and gives the blades an excellent rasp gentleness over a longer period of time. It is not necessary to use the substance

009830/0014

15A504Q

to be networked for fixation on the blade. In certain cases, elevated temperatures of up to 200 ^° C. can also be used. In contrast to the fluorocarbon polymers, the substances can also be applied to normal carbon blades.

The substances according to the invention are polydiorganosiloxanes, which have a varying content of acetylaoetonate groups in the side chains and have the following general structure:

-ξ-

η Z

-O-

-O

CH ₃ -CT TJ- (B,

(D

= identical or different alkyl, aralkyl, Aryl, preferably methyl and / or phenyl,

= unbranched or branched two-functional hydrocarbon radical, preferably -CH ₂ CH ₂ -, - (CHg) ₅ -, -CH ₂ , CH (CH,). CHiCH,). CH ₂ -, -CH ₂ .CH (CH ₃ ) -, - (

= 0 to 500, '= 1 to 10,000

Depending on the content of aoetylaoetonal groups of the type Z and R. The products are viscous rubbers or high-viscosity oils Easily soluble in organic solvents and in solution can be sprayed onto cold or hot razor blades will.

Preferably silicone oils and braffin oils of various viscosities are added to the solution or Oktomethylceolotetrasiloxan inter alia in contents of 5 to 300 # based on solid product added. Of the Coating can be dried at room temperature or optionally, depending on the composition, at temperatures up to heated for a few seconds to hours. '

009830/0014 ^8AD original

15450Α0

It is therefore not networked. It is believed that the acetylacetonal groups cause it to adhere to the steel surface. The coating can optionally after drying with silicone oils of different viscosities, e.g. with ootamethylcyelotetrasiloxane or with paraffin oils, be sprayed over. It is effective over a large number of shaves and is hydrolytically insensitive. As a result after immersion of the blades, especially in hot water, the coating does not become through hydrolysis and undesired further cross-linking changed significantly disadvantageously. Such a change would have a decrease in favorable Shaving ability on a second shave or even a complete disappearance of the improved properties result. Likewise, the effect on the unused other side would be due to immersion in Water can be significantly worsened. It is also an advantage of the new coating that it prevents stripping the blade is insensitive to a cloth. The new coating of the blades also changes at Do not store any longer at higher temperatures.

Since the coating substance does not need to be crosslinked in order to become fixed on the blade, but is by nature a solid, linear polymeric substance, it is also not necessary to pay attention to a certain degree of crosslinking with the resulting downsides for the burn-in.

The substances according to the invention are obtained by adding alkenyl acetylaoetone of the general formula:

R ₂ CH ^

R ₁ - CH - L - ChCc "O ^Rl ' ^R 2 ^R 3" w ^ethyl y /

1 r pC «0 ■" hydrogen

to regular or random polydiorganosiloxanes, which carry a changing content of Si-H groups, manufactured. Containing the regular Sl-H groups

0 0 9830 / OOU _n . _D ORIGINAL

Polydlorganosiloxane, of the general formula: "YR ₁ \ R-,

I i ¹ \ ι ⁵ ( ₂ ).

(H ₁ , R ₂ , Ry η and χ as in formula (l)

- Si - 0 - Si - 0 -

In H χ

are made by polycondensation ofcC.60 - polydiorganosiloxanediols with an organodichlorosilane of the general formula R / ^ \ SiHCLp in the presence of an HCl acceptor obtain.

The addition of the Alkenjrlacetylacetone the Si-H group is created by adding catalytic amounts of radical-forming compounds such as benzoyl peroxide and azodiisobutyronitrile, or by irradiation with UV light, but preferably by heating in Presence of catalytic amounts of hexaplationochloric acid or platinum charcoal. The addition is preferably carried out in inert organic solvents. the Adducts are obtained in practically quantitative yield. They are made by heating to 140 ° C in the Separated volatiles under vacuum at 0.5 torr.

The products are preferably in methyl isobutyl ketone, Acetone, trichlorethylene or tetra-chlorocarbon dissolved and sprayed in this solution onto degreased blades or applied by dipping .

Claims (1)

Claims. L / \ Cutting edge coating for safety razor blades to improve their properties when shaving, characterized by linear polymeric polydiorganosiloxanes, which carry acetylaoetonate side groups alone or in a mixture with other substances. 0 0 9 8 3 0/0 0 U ^B &> original 2. Blade cover according to claim 1, characterized in that as linear polymer, -acetyl acetonate-group-bearing polysiloxanes of the general formula - Si - 0 - Si - O - P (O) (OH) are related, wherein R ₁ , Rp, R ^ aliphatic or aromatic hydrocarbon radicals, preferably a methyl and / phenyl radical, Z is a two-functional branched or unbranched hydrocarbon radical,
η = 0 to 500 and
χ = 1 - 10,000. 5. Blade cover according to claim 2, characterized in that as a two-functional branched or unbranched hydrocarbon radical, the groups -CH ₂ -CH ₂ -, -CH ₂ , CHg.CH ₂ -, -CH ₂ C (CH ₃ ) H-, -CH ₂ .CH (CH,) -CH ₂ - and -CH ₂ .C (Ch ^) ₂ - are related. 4. Process for the production of the coating material according to one of claims 1 b-is 3, characterized in that the addition of the alkenyl acetylacetone to the Si-H groups-bearing polydiorganosiloxides according to claim 1 in the presence of inert solvents at temperatures of ⁰ ° C-180 ° C takes place, the acetylacetone being used up to a two-molar excess. 5. The method according to claim 4, characterized in that the addition in the presence of voriv catalytic amounts of HgPtClg.ö HgO.oder Platinköh ^ e or in the presence of Radlkalbildender 'substances such as Azqdlisobutyronitril or BenzoylpQroxyd, at temperatures of 40 ⁰ C to 180 ° C is performed. ■. , BAD ORfGJNAL 009830/001 4 15A5040 £. Process according to Claim 4, characterized in that the addition takes place by simple heating to 40 ⁰ C to 180 ° C or by UV irradiation. 7. A method for applying the cutting edge coating according to any one of claims 1 to 6, on razor blades, characterized in that the linear polymeric acetylacetonate-containing polydiorganosiloxanes in solution or emulsion, alone or in a mixture with silicone oils or paraffin oils of different viscosity, in amounts of 5 to 500 % based on the polysiloxane is applied to the cutting edges. 8. The method according to claim 7 *, characterized in that the blade edges are sprayed with the solutions or dipped into the solutions and then ^{dried at temperatures of 20-200 0} C for several days to a few seconds. 9. The method according to claim 8, characterized in that the treated blades are sonic subsequently sprayed over with a silicone oil or paraffin oil or dipped into them. 009830 / QOU