Adhesive composition, protective film for a polarizing plate, polarizing plate, and liquid crystal display
First Claim
1. A polarizer comprising:
- a polarizing film or polarizing element; and
a protective film attached to a side or both sides of the polarizing film or polarizing element,wherein the protective film comprises;
a base film, anda pressure sensitive adhesive layer on a side or both sides of the base film,wherein the pressure sensitive adhesive layer comprises a cured product of a pressure-sensitive adhesive composition satisfying a condition of General Formula 1 given below;
Δ
X≦
2 nm,
[General Formula 1]wherein Δ
X represents an absolute value of a phase retardation (Rin) in a surface-direction, the phase retardation being measured by an equation, Rin={(nx−
ny)×
d}, when a sheet-shaped pressure-sensitive adhesive that has a width of 10 mm and a length of 20 mm and that is prepared by using the pressure-sensitive adhesive composition is elongated by 500 μ
m in a longitudinal direction at 23°
C.,wherein nx represents a refractive index along a horizontal axis in a surface of the sheet-shaped pressure-sensitive adhesive, ny represents a refractive index along a vertical axis in the surface of the sheet-shaped pressure-sensitive adhesive, and d represents a thickness of the sheet-shaped pressure-sensitive adhesive,wherein the base film is a saturated cycloolefin film;
an olefin thermoplastic resin film having a substituted or unsubstituted imide group in its side chain;
a thermoplastic resin film having a substituted or unsubstituted phenyl group and nitrile group in its side chain;
or an acrylic film,wherein a stress optical coefficient of the saturated cycloolefin film;
the olefin thermoplastic resin film having a substituted or unsubstituted imide group in its side chain;
the thermoplastic resin film having a substituted or unsubstituted phenyl group and nitrile group in its side chain is 6 brewster or less, and the stress optical coefficient of the acrylic film is 3 brewster or less, andwherein the pressure sensitive adhesive composition comprises a compound having a positive stress optical coefficient expressed by Formula 3 or Formula 4;
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Abstract
The present invention relates to a pressure-sensitive adhesive composition, a protective film for polarizers, which includes a cured product of the pressure-sensitive adhesive composition, a polarizer, and a liquid crystal display (LCD). In the present invention, a pressure-sensitive adhesive showing excellent endurance reliability in high-temperature and/or high-humidity conditions and having superior physical properties such as cuttability, re-peeling property, and workability can be provided. In particular, it is possible to provide the pressure-sensitive adhesive composition which can prevent light leakage that may occur in an LCD, even when being applied to a film having a low stress optical coefficient.
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Citations
17 Claims
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1. A polarizer comprising:
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a polarizing film or polarizing element; and a protective film attached to a side or both sides of the polarizing film or polarizing element, wherein the protective film comprises; a base film, and a pressure sensitive adhesive layer on a side or both sides of the base film, wherein the pressure sensitive adhesive layer comprises a cured product of a pressure-sensitive adhesive composition satisfying a condition of General Formula 1 given below;
Δ
X≦
2 nm,
[General Formula 1]wherein Δ
X represents an absolute value of a phase retardation (Rin) in a surface-direction, the phase retardation being measured by an equation, Rin={(nx−
ny)×
d}, when a sheet-shaped pressure-sensitive adhesive that has a width of 10 mm and a length of 20 mm and that is prepared by using the pressure-sensitive adhesive composition is elongated by 500 μ
m in a longitudinal direction at 23°
C.,wherein nx represents a refractive index along a horizontal axis in a surface of the sheet-shaped pressure-sensitive adhesive, ny represents a refractive index along a vertical axis in the surface of the sheet-shaped pressure-sensitive adhesive, and d represents a thickness of the sheet-shaped pressure-sensitive adhesive, wherein the base film is a saturated cycloolefin film;
an olefin thermoplastic resin film having a substituted or unsubstituted imide group in its side chain;
a thermoplastic resin film having a substituted or unsubstituted phenyl group and nitrile group in its side chain;
or an acrylic film,wherein a stress optical coefficient of the saturated cycloolefin film;
the olefin thermoplastic resin film having a substituted or unsubstituted imide group in its side chain;
the thermoplastic resin film having a substituted or unsubstituted phenyl group and nitrile group in its side chain is 6 brewster or less, and the stress optical coefficient of the acrylic film is 3 brewster or less, andwherein the pressure sensitive adhesive composition comprises a compound having a positive stress optical coefficient expressed by Formula 3 or Formula 4; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A polarizer comprising:
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a polarizing film or polarizing element; and a protective film attached to a side or both sides of the polarizing film or polarizing element, wherein the protective film comprises; a base film disposed on the polarizing film or polarizing element, and a pressure sensitive adhesive layer disposed on a side of the base film opposite to the polarizing film or polarizing element, wherein the pressure sensitive adhesive layer is a cured product of a pressure-sensitive adhesive composition satisfying a condition of General Formula 1 given below;
Δ
X≦
2 nm,
[General Formula 1]wherein Δ
X represents an absolute value of a phase retardation (Rin) in a surface-direction, the phase retardation being measured by an equation, Rin={(nx−
ny)×
d}, when a sheet-shaped pressure-sensitive adhesive that has a width of 10 mm and a length of 20 mm and that is prepared by using the pressure-sensitive adhesive composition is elongated by 500 μ
m in a longitudinal direction at 23°
C., wherein nx represents a refractive index along a horizontal axis in a surface of the sheet-shaped pressure-sensitive adhesive, ny represents a refractive index along a vertical axis in the surface of the sheet-shaped pressure-sensitive adhesive, and d represents a thickness of the sheet-shaped pressure-sensitive adhesive,wherein the base film is a saturated cycloolefine film, an olefine thermoplastic resin film having a substituted or unsubstituted imide group in its side chain;
a thermoplastic resin film having a substituted or unsubstituted phenyl group and nitrile group in its side chain;
or an acrylic film,wherein a stress optical coefficient of the saturated cycloolefine film, the olefine thermoplastic resin film having a substituted or unsubstituted imide group in its side chain;
or the thermoplastic resin film having a substituted or unsubstituted phenyl group and nitrile group in its side chain is 6 brewster or less and a stress optical coefficient of the acrylic film is 3 brewster or less,wherein the pressure-sensitive adhesive composition comprises;
a base resin that is a polymer of a monomer mixture including a (meth)acrylic acid ester monomer, a crosslinking monomer and a compound expressed by Formula 2 given below; and
a crosslinking agent crosslinking the base resin; - View Dependent Claims (17)
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Specification