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adhesive composition

A composition and adhesive technology, applied in the direction of adhesive types, ester copolymer adhesives, adhesives, etc., can solve the problems of poor coatability, durability defects, decreased productivity, etc., and achieve the goal of inhibiting durability Effects of poor performance, excellent coatability, good productivity

Active Publication Date: 2017-05-24
DONGWOO FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above technique also has disadvantages: the viscosity of the acrylic copolymer may increase due to an increase in the concentration of the acrylic copolymer, thus deteriorating the coatability, causing defects such as coating streaks (coating unevenness) ), resulting in a decrease in productivity
In this case, the viscosity of the solution containing the copolymer (rather than monomers containing oxyethylene groups, such as phenoxyethyl acrylate and phenoxydiethylene glycol acrylate) increased slightly, but still exhibited Increased, resulting in poor coatability
Additionally, when the molecular weight of the acrylic copolymer is reduced to reduce the amount of solvent used as described above, the cohesion of the adhesive decreases and thus durability defects are more likely to occur

Method used

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preparation example Construction

[0047] The preparation method of the copolymer is not particularly limited. The copolymer can be prepared by methods conventionally used in the art, such as bulk polymerization, solution polymerization, emulsion polymerization, and suspension polymerization. Among them, solution polymerization is preferable. In addition, solvents, polymerization initiators, chain transfer agents for controlling molecular weight, and the like conventionally used at the time of polymerization can be used.

[0048] The acrylic adhesive composition of the present invention may further contain a crosslinking agent.

[0049] Crosslinkers improve adhesion and durability, and maintain the adhesive's high-temperature reliability and shape.

[0050] Examples of the cross-linking agent may include isocyanate-based cross-linking agents, epoxy-based cross-linking agents, melamine-based cross-linking agents, peroxide-based cross-linking agents, metal chelate-based cross-linking agents, and oxazoline-based...

preparation example 1

[0062] The monomers of 86 parts by weight of n-butyl acrylate (BA), 8 parts by weight of benzyl methacrylate (BzMA), 5 parts by weight of acrylic acid (AA) and 1 part by weight of 4-hydroxybutyl acrylate (4-HBA) The mixture was charged into a 1 L reactor equipped with a cooling device for promoting nitrogen reflux and controlling temperature, and then 100 parts by weight of ethyl acetate (EAc) as a solvent was charged thereinto. Thereafter, nitrogen was purged for 1 hour to remove oxygen, and then the temperature was maintained at 80°C. Stir the monomer mixture until smooth. Subsequently, 0.07 parts by weight of azobisisobutyronitrile (AIBN) was charged as a reaction initiator, followed by reaction for 8 hours, thereby preparing an acrylic copolymer (A-1) having a weight average molecular weight of about 800,000.

preparation example 2～6 and comparative preparation example 1～9

[0064] An acrylic copolymer was prepared in the same manner as Preparation Example 1, but using the monomer composition shown in Table 1 below.

[0065] Here, the following Preparation Example 4 was performed in the same manner as Preparation Example 1 except that 130 parts by weight of ethyl acetate (EA) was used. The following Preparation Example 7 was performed in the same manner as Preparation Example 1 except that 200 parts by weight of ethyl acetate (EA) was used and the temperature was kept at 90°C.

[0066] [Table 1]

[0067]

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Abstract

The present invention relates to an adhesive composition, and more specifically, to an adhesive composition comprising: an acrylic copolymer having a weight average molecular weight (polystyrene conversion, Mw) of at least 500,000; and a solvent, wherein the acrylic copolymer is prepared by copolymerizing a monomer containing 5 to 10 wt% of a monomer having a carboxy group, contains at least 25 wt% of solid content, and maintains a viscosity of no more than 1000c, thereby allowing the adhesive composition to have a higher solid content and lower viscosity by using a smaller quantity of the solvent compared to existing adhesive compositions, and thus can improve coating properties without faulty coating and reduce curing time, while maintaining at least the same amount of light leakage prevention compared to existing adhesive compositions.

Description

technical field [0001] The present invention relates to an adhesive composition capable of improving coatability and thus preventing occurrence of coating unevenness and easily securing durability. Background technique [0002] Generally, a liquid crystal display (LCD) is provided with a liquid crystal cell including liquid crystal and a polarizing plate, and uses an adhesive layer to bond the liquid crystal cell and the polarizing plate. As the adhesive, an acrylic adhesive including an acrylic polymer having excellent adhesiveness and transparency as a base material is often used. [0003] Recently, the size of the polarizing plate has become larger with the increase in the size of the LCD panel, so the residual stress of the protective film and the adhesive layer has also become larger. This causes an increase in birefringence, so the light leakage problem gets worse. [0004] In order to minimize light leakage occurring under such residual stress, a material exhibiting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/04C09J4/00C09J11/00
CPCC09J133/064
Inventor 崔汉永柳智熙
Owner DONGWOO FINE CHEM CO LTD
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