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Adhesive tape

A technology of adhesive tape and gel rate, applied in the direction of adhesive, adhesive type, film/sheet adhesive, etc., can solve the problems of weakened surface release effect, irregular mold surface, and floating of the bonding surface, etc. , to achieve the effect of increasing gel rate and molecular weight, improving work efficiency, and improving anti-reflection

Active Publication Date: 2015-08-26
NITTO DENKO SHANGHAI SONGJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since RIM molding is formed by opening and closing the upper and lower molds, and the surface of the mold is irregular and has a certain curvature
After 3000-4000 times of repeated molding, the existing pressure-sensitive tape will have a weakened surface release effect and float on the bonding surface, making it unusable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 30 parts by weight of acrylic acid, 2.5 parts by weight of AIBN, 55 parts by weight of vinyl acetate, and 900 parts by weight of butyl acrylate were mixed, and nitrogen substitution was performed for 2 hours. Superposition was performed at 60° C. for 6 hours under nitrogen substitution to obtain an acrylic polymer (1) having a weight average molecular weight of 500,000 and a gel fraction of 45%.

[0057] Acrylic adhesive (1) was obtained by uniformly blending 100 parts by weight of acrylic polymer (1) and 2 parts by weight of isocyanate compound containing a trifunctional group (trade name "CORONATEL", manufactured by Nippon Polyurethane Co., Ltd.).

[0058] The above-mentioned acrylic adhesive (1) was coated on a fluorinated ethylene-propylene polymer FEP (thickness: 75 μm) as a substrate so that the thickness after drying was 30 μm, and the adhesive tape (1) was obtained after drying.

Embodiment 2

[0060] 40 parts by weight of acrylic acid, 3.0 parts by weight of AIBN, 55 parts by weight of vinyl acetate, and 900 parts by weight of butyl acrylate were mixed, and nitrogen substitution was performed for 2 hours. Superposition was performed at 60° C. for 6 hours under nitrogen substitution to obtain an acrylic polymer (2) having a weight average molecular weight of 600,000 and a gel fraction of 55%.

[0061] Acrylic adhesive (2) was obtained by uniformly blending 100 parts by weight of acrylic polymer (2) and 2 parts by weight of isocyanate compound containing trifunctional groups (trade name "CORONATEL", manufactured by Nippon Polyurethane Co., Ltd.).

[0062] The above-mentioned acrylic adhesive (2) was coated on a fluorinated ethylene-propylene polymer FEP (thickness: 75 μm) as a substrate so that the thickness after drying was 30 μm, and the adhesive tape (2) was obtained after drying.

Embodiment 3

[0064] The procedure of Example 1 was repeated except that the above-mentioned acrylic adhesive (1) of Example 1 was coated on polytetrafluoroethylene PTFE (thickness: 75 μm) as a base material so that the thickness after drying was 30 μm. Adhesive tape (3) was obtained after drying.

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Abstract

The application relates to an adhesive tape which comprises a base material and a pressure-sensitive adhesive layer arranged on the base material in a lamination manner, and is characterized in that the base material is made of a fluorine-containing polymer; the pressure-sensitive adhesive layer is made of a (methyl) acrylate-based adhesive containing a (methyl) acrylate-based polymer. The adhesive tape has favorable contra warping resistance and abrasion resistance and a favorable surface release property before and after abrasion, and after being used, the adhesive tape can be formed and produced repeatedly for about 7,000 times, and floating and release weakening are avoided.

Description

technical field [0001] The application relates to an adhesive tape, which belongs to the field of adhesives. Background technique [0002] Reaction injection molding (reaction injection molding), referred to as RIM molding. In the past, in the RIM molding process, the resin used would contaminate the mold. In order to facilitate later cleaning, the mold will be protected with a pressure-sensitive tape with a release effect on the surface, and it will be peeled off after use. [0003] However, because RIM molding is formed by opening and closing the upper and lower molds, and the surface of the mold is irregular and has a certain curvature. Existing pressure-sensitive adhesive tapes can't be used because the surface release effect is weakened and the bonding surface floats after 3000-4000 times of repeated molding production. Contents of the invention [0004] The problem to be solved by the invention [0005] This application uses a substrate with a release effect and...

Claims

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Application Information

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IPC IPC(8): C09J7/02C09J175/04C08F220/18C08F218/08C08F220/06
Inventor 马文君
Owner NITTO DENKO SHANGHAI SONGJIANG
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