Pressure-sensitive adhesive compositions, polarizers and liquid crystal displays comprising the same

摘要

The present invention relates to a pressure-sensitive adhesive composition including interpenetrating polymer networks in a cured state, wherein the composition comprise a multi-functional acrylate and a thermal initiator; a polarizer; and a liquid crystal display comprising the same. In the present invention, the pressure-sensitive adhesive composition may be provided, which can outstandingly prevent light leakage phenomenon, with having excellent physical properties such as endurance reliability under high temperature and/or high humidity conditions and workability. Especially, according to the present invention, the pressure-sensitive adhesive composition, polarizer and liquid crystal display are provided, which can outstandingly prevent light leakage phenomenon even in large-sized display devices.

主权项

1. A pressure-sensitive adhesive composition, which includes an interpenetrating polymer network in a cured state, and which comprises an acrylic copolymer having a crosslinkable functional group as a base resin, a multi-functional crosslinking agent, a multi-functional acrylate and a thermal initiator,
wherein the composition is in the form of a pressure-sensitive adhesive having removability in the cured state, wherein an adhesion strength of the pressure-sensitive adhesive with respect to alkali-free glass is 800 gf/25 mm or less, wherein the multi-functional acrylate and the thermal initiator form a crosslinking structure by reacting with each other, wherein the thermal initiator has a 10 hours half-life temperature of 40° C. to 80° C., wherein the thermal initiator is comprised in an amount of 2.5 to 10 parts by weight, relative to 100 parts by weight of the acrylic copolymer, wherein the multi-functional crosslinking agent is one or more compounds selected from the group consisting of an isocyanate compound, an epoxy compound, an aziridine compound and a metal chelate compound, and wherein the multi-functional crosslinking agent forms a crosslinking structure by reacting with the crosslinkable functional group of the acrylic copolymer, and wherein the pressure-sensitive adhesive composition including the interpenetrating polymer network has a gel content of 80% to 99% as represented in General Formula 1:
Gel Content (%)=B/A×100  [General Formula 1] wherein A represents weight of the pressure-sensitive adhesive composition in the cured state, and B represents dry weight of insoluble content after depositing the pressure-sensitive adhesive composition in the cured state in ethyl acetate at room temperature for 48 hours.