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Modified polyvinyl alcohol resins and adhesive, polarizer, and display device containing the same

Inactive Publication Date: 2011-12-08
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]An adhesive for a polarizing plate including a modified polyvinyl alcohol-based resin with an acrylic group introduced thereto and having a hydroxyl group formed by the introduction of the acrylic group or an adhesive for a polarizing plate including a polyvinyl alcohol-based resin and a compound having an epoxy group and an acrylic group according to an embodiment of the present invention has excellent adhesion, humidity resistance, and water resistance as well as having excellent solubility with respect to water.
[0017]That is, an acrylic resin is an organic solvent-soluble resin which is not appropriate for using as an adhesive for a polarizing plate because of low solubility with respect to water. Also, a resin, in which a hydrophobic monomer such as (meth)acrylic acid or (meth)acrylate is copolymerized with a typical polyvinyl alcohol-based resin, is impossible to use as a water-based adhesive for a polarizing plate because of the low solubility thereof with respect to water. However, the adhesive for a polarizing plate according to the present invention has excellent adhesiveness, water resistance, and humidity resistance as well as having excellent solubility with respect to water because adhesion, water resistance, humidity resistance and solubility with respect to water by means of a hydroxyl group are complementarily optimized. Therefore, water resistance and humidity resistance of polarizing plate fabricated using the adhesive of the present invention and a display device including the polarizing plate are improved.BEST MODE
[0018]Exemplary embodiments of the present invention will now be described in detail.
[0019]A modified polyvinyl alcohol-based resin (hereinafter, referred to as the ‘AH-PVA’) has an acrylic group introduced thereto and includes a hydroxyl group formed by the introduction of the acrylic group. The modified polyvinyl alcohol-based resin with an acrylic group introduced thereto and having a hydroxyl group formed by the introduction of the acrylic group includes a repeating unit of the following Chemical Formula A, and at least one repeating unit of the following Chemical Formula B1, B2, and B3. For example, the modified polyvinyl alcohol-based resin with an acrylic group introduced thereto and having a hydroxyl group formed by the introduction of the acrylic group may further include a repeating unit of the following Chemical Formula C.
[0020]An AHA-PVA resin including repeating units of Chemical Formulas A, B1, and C according to the present invention may be represented as Chemical Formula I below. However, the AHA-PVA resin is not limited thereto.
[0021]An AHA-PVA resin including repeating units of Chemical Formulas A, B2, and C may be represented as Chemical Formula II below.

Problems solved by technology

However, a typical polyvinyl alcohol-based resin adhesive has limitations in terms of reductions of initial adhesion, humidity resistance, and water resistance.
However, there are limitations in the reduction of solubility of the adhesive with respect to water, and the reduction of adhesiveness due to the addition of a large amount of a water-insoluble acrylate cross-linking agent is combined in the adhesive composition of Korean Patent Laid-Open Publication No. 2006-133215.
However, as line speed (elongation rate) has recently increased in order to improve the productivity of the polarizing plate, there are also limitations in that the humidity resistance, water resistance, and adhesion of the adhesive for a polarizing plate using the polyvinyl alcohol-based resin containing a typical acetacetyl group may be insufficient.

Method used

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  • Modified polyvinyl alcohol resins and adhesive, polarizer, and display device containing the same
  • Modified polyvinyl alcohol resins and adhesive, polarizer, and display device containing the same
  • Modified polyvinyl alcohol resins and adhesive, polarizer, and display device containing the same

Examples

Experimental program
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example 2

[0058]A polyvinyl alcohol resin (average degree of polymerization of 1700, degree of saponification of 95% to 97%, Nippon Synthetic Chemical Industry Co., Ltd., product Z320) was dissolved in pure water at 80° C. for 1 hour, and then 40 parts by weight of glycidylmethacrylate (GMA) was added with respect to 100 parts by weight of the polyvinyl alcohol resin and stirred overnight at room temperature. As a result, GMA was chemically combined with the polyvinyl alcohol resin according to Reaction Formula 1. Meanwhile, a pH level was controlled to about 13 to 14 by adding 1N NaOH during the reaction.

[0059]Thereafter, an AH-PVA resin was analyzed by FT-IR and the presences of the introduced acrylate and formed OH-functional group were confirmed. Also, a content of the introduced GMA was calculated by using NMR and a polyvinyl alcohol resin was obtained in which 2.0 mol % of GMA was introduced.

[0060]A water-based adhesive was prepared by dissolving the prepared AH-PVA resin (average degre...

example 3

[0062]A polyvinyl alcohol resin (average degree of polymerization of 1100, degree of saponification of 99%, Nippon Synthetic Chemical Industry Co., Ltd., product Z210) was dissolved in pure water at 80° C. for 1 hour, and then 5 parts by weight of glycidylmethacrylate (GMA) was added with respect to 100 parts by weight of the polyvinyl alcohol resin and stirred overnight at room temperature. As a result, GMA was chemically combined with the polyvinyl alcohol resin according to Reaction Formula 1. Meanwhile, a pH level was controlled to about 1 to 2 by adding concentrated HCl during the reaction.

[0063]Thereafter, an AH-PVA resin was analyzed by FT-IR and the presences of the introduced acrylate and formed OH— functional group were confirmed. Also, a content of the introduced GMA was calculated by using NMR and a polyvinyl alcohol resin was obtained in which 0.15 mol % of GMA was introduced.

[0064]A water-based adhesive was prepared by dissolving the prepared AH-PVA resin (average degr...

example 4

[0066]A polyvinyl alcohol resin (average degree of polymerization of 600, degree of saponification of 95% to 97%, Nippon Synthetic Chemical Industry Co., Ltd., product Z100) was dissolved in pure water at 80° C. for 1 hour, and then 60 parts by weight of glycidylmethacrylate (GMA) was added with respect to 100 parts by weight of the polyvinyl alcohol resin and stirred at 70° C. for 24 hours. As a result, GMA was chemically combined with the polyvinyl alcohol resin according to Reaction Formula 1. Meanwhile, a pH level was controlled to about 13 to 14 by adding 1N NaOH during the reaction.

[0067]Thereafter, an AH-PVA resin was analyzed by FT-IR and the presences of the introduced acrylate and formed OH-functional group were confirmed. Also, a content of the introduced GMA was calculated by using NMR and a polyvinyl alcohol resin was obtained in which 10.0 mol % of GMA was introduced.

[0068]A water-based adhesive was prepared by dissolving the prepared AH-PVA resin (average degree of po...

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Abstract

Provided are a modified polyvinyl alcohol-based resin with an acrylic group introduced thereto and including a hydroxyl group formed during the introduction of the acrylic group, an adhesive including the modified polyvinyl alcohol-based resin having excellent adhesion, humidity resistance, and water resistance, an adhesive including a polyvinyl alcohol-based resin, and a compound having an epoxy group, and an acrylic group, a polarizing plate and an image display device including the adhesive. The adhesive for a polarizing plate according to an embodiment of the present invention has excellent adhesion, humidity resistance, and water resistance as well as having excellent solubility with respect to water and an increase in adhesion while physical properties of a typical polyvinyl alcohol-based resin are maintained.

Description

TECHNICAL FIELD[0001]The present invention relates to a polyvinyl alcohol-based resin having improved adhesion, humidity resistance, and water resistance, an adhesive including the same, a polarizing plate, and a display device, and more particularly, to a modified polyvinyl alcohol-based resin with an acrylic group introduced thereto and having a hydroxyl group formed by the introduction of the acrylic group; an adhesive for a polarizing plate including the modified polyvinyl alcohol-based resin having excellent adhesion, humidity resistance, and water resistance; an adhesive for a polarizing plate including a polyvinyl alcohol-based resin and a compound having an epoxy group and an acrylic group; a polarizing plate and a display device including the adhesive for a polarizing plate.BACKGROUND ART[0002]A polarizing plate, used in various image display devices such as a liquid crystal display (LCD) device, a plasma display panel (PDP), and an electroluminescent (EL) device, has a str...

Claims

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Application Information

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IPC IPC(8): C09J129/04G02B5/30B32B27/30B32B7/12C08F8/00C08F8/08
CPCG02B5/3033C09J129/04Y10T428/31515Y10T428/31935C08F16/06G02B5/30G02F1/1335C09J151/003G02B5/305G02B1/14
Inventor PARK, SEONG-JUNKWON, KI-OKRAH, KYUN-IL
Owner LG CHEM LTD
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