JPS6248785A - Adhesive tape or film - Google Patents

Abstract

PURPOSE:An adhesive tape or film, obtained by forming an adhesive layer prepared by incorporating a specific polyether with a tackifier resin, etc., and crosslinking the above-mentioned polyether on the surface of a polyester base material and having heat resistance without residual size and staining an adherend. CONSTITUTION:An adhesive tape or film obtained by forming an adhesive layer prepared by incorporating (A) 100pts.wt. polyether, having hydrolyzable silicon groups and the backbone chain having repeating units of chemical bonds expressed by the formula -R-O- (R is bifunctional alkylene) with (B) 50-120 pts.wt. tackifier resin as principal components and crosslinking the component (A) on one unmatted surface of a polyester base material having the unmatted surface an the other matted surface. USE:Tapes for writing characters, etc., used in hot processes.

Description

[Detailed description of the invention] [Industrial application field] This invention has no adhesive residue or adherend contamination, has heat resistance,
This invention relates to adhesive tapes or films used in applications such as drawing tapes used during thermal processes.

[Conventional technology]

Regarding adhesive tapes or films used in applications requiring heat resistance and properties such as drawing tapes used during thermal processes, Japanese Patent Publication No. 52-773 and Japanese Patent Publication No. 1983
For heat-resistant removable adhesives that use natural rubber, synthetic rubber, or acrylic polymer as the base, as seen in Publication No. 2464, the adhesive is generally crosslinked to improve heat resistance and solvent resistance. It is being said.

[Problem that the invention seeks to solve]

By the way, when the above-mentioned natural rubber or synthetic rubber is used as the base of the adhesive, when the adhesive is crosslinked to improve heat resistance and solvent resistance, the adhesive properties tend to decrease. In order to improve this, softeners, fillers, etc. are added, but this requires technical consideration to strike a balance between heat resistance and adhesive properties.

Furthermore, softeners, release agents, and the like may cause a bleeding phenomenon on the surface of the adhesive layer and contaminate the adherend after attachment.

In addition, adhesives using acrylic polymers as a base have the disadvantages that, after being applied to an adherend, the adhesion increases significantly, the peeling force upon re-peeling is heavy, and adhesive remains.

The present invention aims to solve such problems such as contamination of adherends and adhesive residue, and to provide an adhesive tape or film suitable for use as a heat-resistant drawing tape for thermal processing. It has been done.

[Means for solving problems]

The adhesive tape or film of the present invention contains at least one hydrolyzable silicon group on the other side of a polyester base material which has been subjected to matte processing on one side, and the main chain is essentially of the formula -R-0-( R is a divalent alkylene group) The main component is a component in which 50 to 120 parts by weight of a tackifying resin is blended to 100 parts by weight of a polyether having chemically bonded repeating units represented by a divalent alkylene group. It is characterized by the formation of an adhesive layer that is crosslinked with ether.

In this invention, the hydrolyzable silicon group in the polyether is a hydride group bonded to a silicon atom, a halogen group,
These include an alkoxy group, an acyloxy group, a ketoximate group, an amino group, an amide group, an aminooxy group, an alkenyloxy group, an alkenyloxy group, a mercapto group, and the like.

Further, R in the main chain of the polyether is a divalent alkylene group, and preferably has 1 to 4 carbon atoms.

In addition, in this invention, the adhesive resin is compatible with polyether, and includes rosin-based resins such as rosin, rosin ester, and hydrogenated rosin, phenol resin, and terpene resin.
Examples include modified phenol resins such as phenol m fat, xylene resins, petroleum resins, terpene resins, and chroman resins. The amount added is 5 to 140 parts by weight per 100 parts by weight of polyether.

In addition to the above-mentioned adhesive resin, additives used in ordinary solvent-free adhesive resin compositions, such as anti-aging agents, pigments, plasticizers, etc., can be added as necessary.

In order to form such an adhesive composition on a polyester base material, a so-called hot-melt coating method, in which it is dissolved in a solvent and applied and dried, or it is heated and melted and applied, is employed. Crosslinking of the polyether component of the adhesive is then achieved by heating in the presence of moisture.

Heating for one to several minutes at around 120°C is usually required.

In addition, when applying the adhesive layer, it is preferable to perform a treatment such as corona treatment or undercoating on the coated surface of the polyester tape or film as the base material in advance in order to improve the adhesive strength with the adhesive.

Further, the matte processing performed on one side of the polyester base material is for the purpose of imparting writing ability with a ballpoint pen, pencil, ink, etc., and the particle size is adjusted depending on the degree of writing ability.

In addition, for mold release treatment applied to the back side of the base material, silicone-based adhesives tend to be difficult to release against this adhesive, so non-silicon-based release agents such as fluorine-based mold release agents, long-chain release agents, etc. An alkyl group-containing type of mold release agent, particularly the latter long-chain alkyl group-containing type of mold release agent, is preferably used.

〔Example〕

100 parts by weight of polyether (MS Polymer #300.3! Fuchi Kagaku Kogyo Co., Ltd.), 3 parts by weight of crosslinking accelerator (#1010, Kanebuchi Kagaku Kogyo Co., Ltd.), adhesive resin (YS Polyster S-
145, terpene-phenolic adhesive resin, Yasu Oil Co., Ltd.), a blend consisting of 70 parts by weight of an ultraviolet inhibitor and 5.0 parts by weight of an anti-aging agent was dissolved in a solvent (100 parts by weight of toluene and 15 parts by weight of methanol). Concentration: 60.3%, viscosity: 3000 cρs) This was coated on the back side of a polyester film (thickness: 75 μm) that had been subjected to cloak treatment on one side, and crosslinked by heating at 120° C. for 10 minutes.

This adhesive tape had excellent properties as shown below.

(Adhesive properties) The adhesive properties of the adhesive tape thus obtained (total thickness: 135μ, glue thickness: 60μ) were as follows:
; 1O1SP adhesive strength (g/29 dragon); 600, development power (
g/25 Dragon) i400, SP retention power: 2 hours or more.

In addition, the SP holding power is determined by applying adhesive tape to a stainless steel plate at 25%.
After pasting with a pasting area of 25 m x 25 m and crimping once with a 2 kg rubber roller, a 1 kg load was attached to the end and the film was heated in a constant temperature room at 23 ± 2 °C and 65% RH until the load dropped. Shown in hours.

(Heat resistance) The adhesive tape of the present invention obtained in the above experiment and a polyester tape using a general rubber adhesive as a comparative example were applied to an aluminum plate, a stainless steel plate, and a glass plate, respectively, at 80°C and 150°C. After leaving it at 160°C, it was cooled to room temperature to check whether the adhesive tape peeled off or not, and a 180° angle beer test was performed using a Schopper type tensile tester at a speed of 300 min/min to test the adherend. I checked the adhesive residue on the. The results were as shown in the table below.

B; Contamination status O: No, △: Partial contamination (writing quality) Written with a ballpoint pen, pencil (2H and HB), felt-tip pen, and colored pencil, respectively, on the matte-treated surface of the adhesive tape of this invention obtained in the above experiment. In all cases, the drawing properties were good.

[Operation and effects of the invention]

As described above, in the present invention, the base material is polyester, one side of which is subjected to matte processing, and the adhesive layer formed on the other side contains at least one hydrolyzable silicon group and has a main chain. 40 to 150 parts by weight of a tackifier resin is blended to 100 parts by weight of a polyether having chemically bonded repeating units essentially represented by the formula -R-0- (R is a divalent alkylene group). The adhesive tape is mainly composed of the above-mentioned polyether and cross-linked with the above-mentioned polyether, so it maintains appropriate adhesiveness, leaves no adhesive residue even when re-peeled, has good drawing ability, and has excellent heat resistance. We can provide film.

゛Therefore, the adhesive tape or film of this invention is
It is suitable for use in fields where heat resistance and removability are required, such as drawing tapes used during thermal processes.

Claims (1)

[Claims] 1. One side of the polyester base material is matte-treated, and the other side thereof contains at least one hydrolyzable silicon group, and the main chain is essentially of the formula -R-O- (R is a divalent alkylene group). ) 5 parts by weight of the tackifier resin for 100 parts by weight of polyether having chemically bonded repeating units shown in
An adhesive tape or film comprising, as a main component, a component containing 0 to 120 parts by weight, and an adhesive layer formed by crosslinking the polyether.