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High-filling modified polyacrylate optical adhesive composition, OCA pressure-sensitive adhesive tape and preparation method of OCA pressure-sensitive adhesive tape

A technology of polyacrylate and pressure-sensitive tape, which is applied in non-polymer organic compound adhesives, pressure-sensitive films/sheets, non-polymer adhesive additives, etc., and can solve problems that are difficult to achieve 100% success and require waste discharge Tape, complex process and other problems, to achieve the effect of improving secondary utilization, improving filling, and enhancing modulus

Pending Publication Date: 2021-08-03
JIANGSU SIDIKE NEW MATERIALS SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual production, it is difficult to achieve 100% success in lamination, and rework may be required at this time
OCA with high adhesion is very easy to leave glue, and further removal of waste tape (heavy tape) is required, which not only makes the process complicated, but also reduces efficiency and increases costs

Method used

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  • High-filling modified polyacrylate optical adhesive composition, OCA pressure-sensitive adhesive tape and preparation method of OCA pressure-sensitive adhesive tape
  • High-filling modified polyacrylate optical adhesive composition, OCA pressure-sensitive adhesive tape and preparation method of OCA pressure-sensitive adhesive tape
  • High-filling modified polyacrylate optical adhesive composition, OCA pressure-sensitive adhesive tape and preparation method of OCA pressure-sensitive adhesive tape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0054] Embodiments 1-6: Synthesis of curable (meth)acrylate copolymers

[0055] Taking Example 1 as an example, its synthesis method is: under a nitrogen atmosphere with a flow rate of 0.2L / min, add 75 parts of dodecyl acrylate, 15 parts of acrylic acid to a flask equipped with a reflux device, a thermometer and a stirring device Isobornyl ester, 10 parts of hydroxyethyl acrylate, and 100 parts of ethyl acetate were stirred to dissolve the monomers, and then the temperature was raised to 65°C, and 0.1 parts of thermal initiator azobisisobutyronitrile was put into the polymerization reaction; the reaction was 6h After cooling and heating, the (meth)acrylate copolymer adhesive was obtained, which was denoted as A1.

[0056] The synthesis method of Examples 2-6 is similar to that of Example 1, and the obtained products are marked as A2-A6. The specific formula is shown in Table 1.

[0057] The component formula table of table 1 embodiment 1~6

[0058]

[0059]

Embodiment 7～12

[0060] Examples 7-12: Grafting reaction of curable (meth)acrylate copolymer

[0061] Taking Example 7 as an example, its synthesis method is: add 100 parts of acrylate copolymer A1, 0.2 part of 2-(meth)acryl ethyl isocyanate to a reaction flask equipped with a reflux device, a thermometer and a stirring device Ester and 0.1 part of antioxidant IRGANOX 1726, stirred evenly and heated up for 5 hours, then cooled down to obtain grafted (meth)acrylate copolymer B1.

[0062] The synthesis method of Examples 8-12 is similar to that of Example 7, and the obtained products are marked as B2-B6. The specific formula is shown in Table 2.

[0063] The component formula table of table 2 embodiment 7~12

[0064]

Embodiment 13～18、 comparative example 1～3

[0065] Examples 13-18, Comparative Examples 1-3: Preparation of OCA pressure-sensitive adhesive tape

[0066] Taking Example 13 as an example, the preparation method of OCA adhesive tape is as follows: 100 parts of grafted (meth)acrylate copolymer adhesive B1, 0.1 part of photoinitiator IRGACURE 184, 3 parts of multifunctional monomer SR259 are mixed and stirred evenly After standing still for defoaming, an acrylic pressure-sensitive adhesive is formed. Coat the acrylic pressure-sensitive adhesive on the heavy release film, bake it at 120°C for 5 minutes, and then attach it to the light release film to form light release film, acrylic The three-layer structure of pressure-sensitive adhesive and heavy-release film is to obtain substrate-free OCA pressure-sensitive adhesive tape C1.

[0067] The preparation method of the OCA tapes of Examples 14-18 and Comparative Examples 1-3 is similar to that of Example 13, and the obtained samples are marked as C2-C9. The specific formula ...

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Abstract

The invention discloses a high-filling modified polyacrylate optical cement composition. The modified polyacrylate optical cement composition comprises (a) a curable (methyl) acrylate copolymer of which the weight-average molecular weight is in a range of 200000 Da to 400000 Da; (b) 0.05 wt% to 0.8 wt% of a (meth) acryloyloxy monomer which can be grafted to the curable (methyl) acrylate copolymer; (c) 0.05 wt% to 1.5 wt% of a photoinitiator; (d) 0.02 wt% to 0.8 wt% of an antioxidant; and (e) 0.5 wt%-5 wt% of a multi-functional monomer which is an acrylate monomer containing two or more functional groups. The curable (methyl) acrylate copolymer is prepared from 60 wt%-85 wt% of a soft monomer, 5 wt%-20 wt% of a hard monomer and 5 wt%-20 wt% of a functional monomer through a polymerization reaction. The invention further discloses a substrate-free OCA pressure-sensitive adhesive tape prepared from the optical adhesive composition and a preparation method of the substrate-free OCA pressure-sensitive adhesive tape. The high-filling modified polyacrylate optical cement composition disclosed by the invention has good reworkability.

Description

technical field [0001] The invention relates to the technical field of adhesive materials, in particular to a high-filling modified polyacrylate optical adhesive composition, a substrate-free OCA pressure-sensitive adhesive tape composed of the optical adhesive composition and a preparation method thereof. Background technique [0002] Most of the handheld mobile terminals on the market now use capacitive multi-touch technology, and the gaps in the screen components are usually filled with optically clear adhesives (OCA). Matched refractive indices reduce reflections between layers and increase display contrast and brightness; also provide impact resistance as structural support. At present, OCA optical glue is widely used in electronic terminal equipment screen components. However, in actual production, it is difficult to achieve 100% success in lamination, and rework may be required at this time. However, OCA with high adhesion is very prone to residual glue, which requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J4/06C09J4/02C09J11/06C09J7/38C09J7/10
CPCC09J4/06C09J11/06C09J7/385C09J7/10
Inventor 金闯梁豪徐富国
Owner JIANGSU SIDIKE NEW MATERIALS SCI & TECH CO LTD
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