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A kind of highly reworkable oca resin composition and oca adhesive tape

A resin composition and tape technology, applied in the directions of graft polymer adhesives, adhesives, adhesive types, etc., can solve the problems of difficult rework, product expansion and shrinkage, and small stretching ratio of OCA tapes, so as to solve the problems of rework. The effect of poor cohesion and improvement of cohesive strength

Active Publication Date: 2022-05-17
SUZHOU FINESET MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the full lamination technology is complicated, the equipment investment cost is high, the requirements for the workshop environment are high, the productivity is low, and rework is difficult
[0004] When the existing OCA tape is prepared, most of the required acrylic prepolymers are polymerized by solution, and then the solvent is extracted. When this method is used to prepare the acrylic prepolymer, the monomer concentration is reduced due to the dilution effect of the solvent. , the molecular weight of the prepolymer is low, and it is difficult to increase the elongation while maintaining the adhesion and cohesion of the final prepared OCA optical adhesive. Repeated use of screen mods
There are also acrylic acid prepolymers in the preparation process, by adding multifunctional acrylic acid monomers or using reactants to increase the molecular weight of the prepolymer, but the process is prone to crosslinking reactions, and the obtained non-long-chain structure Acrylic acid prepolymer, the same Does not have good stretching effect
There are also some direct use of UV light to expose acrylic monomers to polymerize them to make OCA tapes. Due to the lack of the "skeleton" of polyacrylic resins, these products rely on macromolecules formed by cross-linking. Large tensile elongation, no reworkability, and too many acrylic acid monomer components, resulting in too fast UV curing reaction, product expansion and shrinkage due to reaction heat accumulation, and many defects such as poor appearance
[0005] However, the existing OCA tapes do not have good reworkability regardless of other improvement methods, and usually have the following disadvantages:
[0006] 1) The molecular weight of acrylic prepolymer is small, the degree of crosslinking is insufficient, the tensile strength of OCA tape is low, and it is easy to break
[0007] 2) The acrylic prepolymer is excessively cross-linked, and the stretching ratio of the OCA tape is small

Method used

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  • A kind of highly reworkable oca resin composition and oca adhesive tape
  • A kind of highly reworkable oca resin composition and oca adhesive tape
  • A kind of highly reworkable oca resin composition and oca adhesive tape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In parts by mass, weigh 60 parts of isodecyl acrylate, 30 parts of hydroxypropyl acrylate, 10 parts of acryloyl morpholine, and 0.5 parts of azobisisobutyronitrile. The mixed liquid was first deoxygenated with nitrogen for 1 hour, then slowly heated to 60°C, and then bulk polymerization was carried out under the protection of nitrogen. After sufficient reaction, the temperature was further raised to 80°C to obtain polyacrylic acid resin A, and the measured molecular weight was 80W.

Embodiment 1-1

[0025] Take 70 parts of polyacrylic resin A, 20 parts of isodecyl acrylate, 10 parts of hydroxypropyl acrylate, 0.5 parts of benzophenone (BP), and 0.5 parts of 1-hydroxy-cyclohexylbenzophenone (Irgacure 184). After fully stirring, the air bubbles are removed, and the OCA tape is obtained after UV curing. The resulting OCA tape was 175 μm. Test the adhesion of OCA tape to glass, the gel fraction, and the tensile strength at break. The test results are shown in Table 1.

Embodiment 2

[0027] In parts by mass, 60 parts of isodecyl acrylate, 30 parts of hydroxypropyl acrylate, 10 parts of acryloyl morpholine, and 0.1 part of azobisisobutyronitrile were weighed. The mixed liquid was first deoxygenated with nitrogen for 1 hour, then slowly heated to 60°C, and then bulk polymerization was carried out under the protection of nitrogen. After sufficient reaction, the temperature was further raised to 80°C to obtain polyacrylic acid resin B, and the measured molecular weight was 100W.

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Abstract

The invention discloses a highly reworkable OCA resin composition and OCA tape. The OCA resin composition comprises the following components by weight: 50-80 parts of polyacrylic acid resin, 5-20 parts of functional acrylic monomer I, non-functional 0-45 parts of acrylic acid monomer I, 0.2-1 part of hydrogen abstraction free radical photoinitiator, and 0.2-1 part of cleavage type UV photoinitiator, wherein the molecular weight of the polyacrylic resin is 50-1 million, and the non- Functional monomer I contains a tertiary C structure. The OCA adhesive tape prepared by adopting the above OCA resin composition has good reworkability, strong adhesion to glass, excellent tensile strength and weather resistance.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a highly reworkable OCA resin composition and an OCA adhesive tape. Background technique [0002] OCA (Optically Clear Adhesive) is a special adhesive used for bonding transparent optical components or screen modules. It requires colorless transparency, a light transmittance of more than 90%, and good bonding strength. It can be used at room temperature or at medium temperature. Curing, and has the characteristics of small curing shrinkage. [0003] The full lamination technology is to glue the display screen and the touch screen together seamlessly with glue or optical glue, which can prevent the intrusion of dust and water vapor. Full-fit OCA glue fills no gaps, can eliminate the air between the screens of the frame-mounted technology, can greatly reduce light loss to improve brightness, increase the display effect of the screen, and reduce noise interference; simpli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F265/06C08F220/18C08F220/28C08F220/58C08F2/48C09J7/30C09J151/00
CPCC08F265/06C08F220/18C09J7/30C09J151/003C08F2/48
Inventor 马超陆星辰安明星刘齐文
Owner SUZHOU FINESET MATERIAL TECH CO LTD