| 摘要 |
PROBLEM TO BE SOLVED: To provide a polarizing plate protection film varying little in double refractive index, avoiding formation of carbonized degraded materials during melt molding, preventing color unevenness of a liquid crystal display when used as a protective film for a polarizing film, and being excellent in contrast. SOLUTION: This polarizing plate protection film is deposited on at least one side of a polarizing film and is composed of polymethylpentene. The polymethylpentene is a single polymer of 4-methyl-1-pentene or a copolymer of 4-methyl-1-pentene with otherα-olefin, e.g.α-olefin with 2 to 20 carbon atoms, such as ethylene, propylene, 1-butene, 1-hexene, 1-octene, 10-decene, 1-tetradecene, 1-octadecene, etc. Since the polymethylpentene has a melting point of 210 to 260 deg.C, it is excellent in heat resistance.
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