| 摘要 |
PURPOSE:To obtain the titled film excellent in retentivity of an antistatic effect, by mixing a specified comb-like copolymer with a thermoplastic resin, forming the mixture into a film and drawing this film. CONSTITUTION:A comb-like copolymer (B) is obtained by polymerizing 10-80wt% high-MW monomer (a), number-average MW of 1,500-20,000, having a polymer part of a vinyl monomer and one polymerizable vinyl group bonded to one of the terminals of the polymer part with 20-90wt% hydrophilic functional group-containing monomer (e.g., an acrylate having a polyoxyethylene chain as an ester residue) and/or an ionic functional group-containing vinyl monomer (B) (e.g., 4-vinylpyridine derivative) and a vinyl monomer (c) copolymerizable with components (a) and (b) (e.g., alpha-methylstyrene). A mixture formed by mixing a thermoplastic resin (A) (e.g., PS) and component B in an amount to provide 0.1-15wt%, based on the obtained mixture, component (b) is formed into a film, and this film is drawn.
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