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adhesive composition

A composition and adhesive technology, applied in the direction of adhesive types, adhesives, polyurea/polyurethane adhesives, etc., can solve problems such as equipment blockage, improve equipment blockage, improve antistatic properties, and improve durability Effect

Inactive Publication Date: 2016-12-21
DONGWOO FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is important to control the amount of the catalyst used for the crosslinking reaction, especially when it is added in excess, there is a risk of clogging of equipment and the like.

Method used

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] The preparation method of the copolymer is not particularly limited, and can be prepared by methods such as bulk polymerization, solution polymerization, emulsification polymerization or suspension polymerization commonly used in the art, preferably solution polymerization. In addition, when performing polymerization, generally used solvents, polymerization initiators, chain transfer agents for controlling molecular weight, and the like can be used.

[0040] The copolymer has a weight average molecular weight (in terms of polystyrene, Mw) measured by gel permeation chromatography (Gel permeation chromatography, GPC) of 5 to 2 million, preferably 400 to 2 million. When the weight-average molecular weight is less than 50,000, the cohesive force between the copolymers is low, which may cause problems in adhesion durability. When the weight-average molecular weight exceeds 2 million, in order to ensure Due to process nature, a large amount of diluent solvent may be required...

preparation example 1-12 and comparative preparation example 1-8

[0056] Into a 1 L reactor equipped with a cooling device so that nitrogen gas can be refluxed and the temperature can be easily adjusted, a monomer mixture composed of the composition in Table 1 below was added, and then 100 parts by weight of ethyl acetate as a solvent was added. ester. Next, nitrogen was purged for 1 hour to remove oxygen, and the temperature was maintained at 78°C thereafter. The above mixture was uniformly mixed, then, 0.03 parts by weight of azobisisobutyronitrile (AIBN) was added as a reaction initiator, and the reaction was carried out for 8 hours to prepare an acrylic copolymer having a weight average molecular weight of about 730,000.

[0057] [Table 1]

[0058]

Embodiment 1-19 and comparative example 1-10

[0060] As shown in Table 2 below, after mixing the acrylic copolymer, ionic antistatic agent, crosslinking agent and silane coupling agent, dilute it with ethyl acetate to prepare an adhesive combination with a solid content concentration of 15%. things.

[0061] [Table 2]

[0062]

[0063]The adhesive composition prepared in the above manner was coated on a release film coated with a silicon release agent in a thickness of 25 μm, and dried at 100° C. for 1 minute to form an adhesive bond. Floor. In addition, a release film was further laminated on the adhesive layer to prepare an adhesive sheet.

[0064] After the release film of the prepared pressure-sensitive adhesive sheet was peeled off, the pressure-sensitive adhesive layer prepared above was laminated on an iodine-based polarizer having a thickness of 185 μm by adhesion processing to prepare an adhesive-attached polarizing plate. The prepared polarizing plate was stored at 23° C. and 60% RH for 20 days.

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Abstract

The present invention relates to an adhesive composition, more specifically, by containing an acrylic copolymer, an isocyanate crosslinking agent and a lithium trifluoromethanesulfonylimide salt, it is possible to simultaneously improve antistatic properties and durability In addition, it is an adhesive composition that does not reduce physical properties due to changes over time (high temperature or high temperature and high humidity environmental changes), shortens the curing time, and improves light leakage, wherein the acrylic copolymer is relative to the copolymer. The total content of 100 parts by weight contains 4 to 30 parts by weight of (meth)acrylic acid, 0.1 to 2 parts by weight of (meth)acrylate monomers with primary hydroxyl groups, and 6 to 12 parts by weight of (meth)acrylate monomers with aromatic rings. base) acrylate monomer.

Description

technical field [0001] The present invention relates to an adhesive composition which is excellent in antistatic properties and durability, has shortened curing time, and has improved light leakage. Background technique [0002] Generally, a liquid crystal display device (Liquid Crystal Display Device, LCD) includes a liquid crystal cell containing liquid crystal and a polarizing plate, and an appropriate adhesive layer for joining them together can be used. As an adhesive, an acrylic adhesive based on an acrylic copolymer excellent in adhesiveness and transparency is often used. [0003] When the release film is peeled from the adhesive layer in the process of attaching the polarizing plate to the liquid crystal cell, static electricity is generated, and the generated static electricity affects the orientation of the liquid crystal, causing a malfunction, or due to Foreign matter that flows between the liquid crystal cell and the adhesive due to electrostatic attraction ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/04C09J11/04
CPCC08G18/6229C08G18/6254C09J175/04C09J2203/318C09J2433/00C09J11/04
Inventor 崔汉永权惠琳
Owner DONGWOO FINE CHEM CO LTD
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