Polarizing Plate and Liquid Crystal Display Device Comprising the Same
First Claim
Patent Images
1. A polarizing plate comprising:
- a polarizer; and
at least two protective films provided on both sides of the polarizer,wherein the polarizing plate has an adhesive layer provided on at least one side of the polarizing plate, andwherein the adhesive layer is formed by spreading an adhesive comprising a (meth)acrylic copolymer composition comprising;
(A) 100 parts by mass of a copolymer comprising;
(a1) a (meth)acrylic acid ester monomer having Tg of less than −
30°
C. in a form of homopolymer in a mass proportion of 75% by mass or more as calculated in terms of monomer unit;
(a2) a vinyl group-containing compound having Tg of −
30°
C. or more in a form of homopolymer in a mass proportion of 25% by mass or less as calculated in terms of monomer unit; and
(a3) a functional group-containing monomer reactive with a polyfunctional compound (B) in an amount of 10 parts by mass or less based on 100 parts by mass of a sum of the mass of the monomer (a1) and the compound (a2); and
(B) from 0.005 to 5 parts by mass of a polyfunctional compound having at least two functional groups in a molecule, and the at least two functional groups can react with a functional group in the functional group-containing monomer (a3) to form a crosslinked structure, andwherein a gel fraction of the adhesive is from not smaller than 40% by mass to not greater than 90% by mass.
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Abstract
A polarizing plate comprising a protective film provided on the both sides of a polarizer, wherein the polarizing plate has an adhesive layer provided on at least one side thereof, which adhesive layer comprising a (meth)acrylic copolymer composition composed of (A) a specific (meth)acrylic copolymer reactive with the following polyfunctional compound (B) and (B) a polyfunctional compound and having a specific gel fraction.
41 Citations
32 Claims
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1. A polarizing plate comprising:
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a polarizer; and at least two protective films provided on both sides of the polarizer, wherein the polarizing plate has an adhesive layer provided on at least one side of the polarizing plate, and wherein the adhesive layer is formed by spreading an adhesive comprising a (meth)acrylic copolymer composition comprising; (A) 100 parts by mass of a copolymer comprising; (a1) a (meth)acrylic acid ester monomer having Tg of less than −
30°
C. in a form of homopolymer in a mass proportion of 75% by mass or more as calculated in terms of monomer unit;(a2) a vinyl group-containing compound having Tg of −
30°
C. or more in a form of homopolymer in a mass proportion of 25% by mass or less as calculated in terms of monomer unit; and(a3) a functional group-containing monomer reactive with a polyfunctional compound (B) in an amount of 10 parts by mass or less based on 100 parts by mass of a sum of the mass of the monomer (a1) and the compound (a2); and (B) from 0.005 to 5 parts by mass of a polyfunctional compound having at least two functional groups in a molecule, and the at least two functional groups can react with a functional group in the functional group-containing monomer (a3) to form a crosslinked structure, and wherein a gel fraction of the adhesive is from not smaller than 40% by mass to not greater than 90% by mass. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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2. A polarizing plate comprising:
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a polarizer; and at least two protective films provided on both sides of the polarizer, wherein the polarizing plate has an adhesive layer provided on at least one side of the polarizing plate, and wherein the adhesive layer is formed by spreading an adhesive comprising a (meth)acrylic copolymer composition comprising; (A1) 100 parts by mass of a copolymer having a mass-average molecular mass of 1,000,000 or more comprising; (a11) a (meth)acrylic acid ester monomer having Tg of less than −
30°
C. in a form of homopolymer in a mass proportion of 75% by mass or more as calculated in terms of monomer unit;(a12) a vinyl group-containing compound having Tg of −
30°
C. or more in a form of homopolymer in a mass proportion of 25% by mass or less as calculated in terms of monomer unit; and(a13) a functional group-containing monomer reactive with a polyfunctional compound (B) in an amount of 10 parts by mass or less based on 100 parts by mass of a sum of the mass of the monomer (a11) and the compound (a12); and (A2) from 20 to 200 parts by mass of a copolymer having a mass-average molecular mass of 100,000 or less comprising; (a21) a (meth)acrylic acid ester monomer having Tg of less than −
30°
C. in a form of homopolymer in a mass proportion of 75% by mass or more as calculated in terms of monomer unit;(a22) a vinyl group-containing compound having Tg of −
30°
C. or more in a form of homopolymer in a mass proportion of 25% by mass or less as calculated in terms of monomer unit; and(a23) a functional group-containing monomer reactive with a polyfunctional compound (B) in an amount of 10 parts by mass or less based on 100 parts by mass of a sum of the mass of the monomer (a21) and the compound (a22); and (B) from 0.005 to 5 parts by mass of a polyfunctional compound having at least two functional groups in a molecule, and the at least two functional groups can react with a functional group in the functional group-containing monomers (a13) and (a23) to form a crosslinked structure, and wherein a gel fraction of the adhesive is from not smaller than 40% by mass to not greater than 90% by mass, and wherein an amount of repeating units derived from the functional group-containing monomers (a13) and (a23) incorporated in the (meth)acrylic copolymers (A1) and (A2), respectively, satisfies a percent functional group distribution range of from 0 to 15% by mass defined by numerical formula (1);
Percent functional group distribution=[mass of repeating units derived from functional group-containing monomer (a23) in (meth)acrylic copolymer (A2)/mass of repeating units derived from functional group-containing monomer (a13) in (meth)acrylic copolymer (A1)]×
100
(1)
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Specification