KOMPOSITION LEMPLIG FOR FRAMSTELLNING TILL EN SJELVFORSEGLANDE FILM

摘要

1491872 Polyolefin compositions EXXON RESEARCH & ENG CO 9 May 1975 [5 July 1974] 29970/74 Heading C3P Compositions suitable for making self-sealing films with good antifog properties and good oxygen permeability comprise (1) 95À0 to 99À9 weight per cent of either a copolymer of ethylene with a vinyl or hydrocarbyl-substituted ester of a C 1-30 monocarboxylic acid or a mixture of a thermoplastic polyolefin with such a copolymer, the copolymer or mixture of thermoplastic polyolefin and copolymer containing 0À10 to 1À95 weight per cent of polymerized vinyl or substituted vinyl ester, and (2) 0À1 to 5À0 weight per cent of a partial ester of a of a carboxylic acid and a polyol. The compositions may be made into films by tubular blowing or chill roll casting. Preferred partial esters are sorbitan monolaurate, monostearate and monobehenate. In an example film is blown from a composition comprising polyethylene, ethylene/vinyl acetate copolymer and sorbitan monolaurate, the vinyl acetate content of the polymer blend being 1À83 weight per cent.