Ethylene-vinyl acetate film suitable for stretch wrapping
AssigneeAsahi-Dow Limited
InventorsHirokuni Naito, Isao Yoshimura, Norito Takao, Yasuta Kawame
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Abstract
There are disclosed films for stretch wrapping which comprise an olefin polymer, preferably a specific ethylene-vinyl acetate copolymer (referred to as "EVA copolymer" hereinafter) and specific polyalkylene ether polyols and non-ionic surfactants of fatty acid and polyhydric alcohol ester derivatives and which have suitable orientation expressed by heat shrinkage and excellent elastic recovery, by which excellent mechanical strength, wrapping finish, optical characteristics and preservability of the goods, especially fresh foods are attained. Method for producing said films is also disclosed. These films are suitable also for wrapping by automatic wrapping machines.
Claims14
Films for stretch wrapping which comprise (1) 99.7-98% by weight of an ethylene-vinyl acetate copolymer having a melt index of 0.5-15 and containing 5-30% by weight of vinyl acetate and (2) 0.3-2% by weight of an additive, said additive comprising (A) 10-40% by weight of at least one polyalkylene ether polyol having a boiling point of at least 200.degree. C. at 760 mm. Hg and a viscosity of less than 1,000 cps at 23.degree. C. and (B) 90-60% by weight of at least one non-ionic surfactant which is an ester of a polyhydric alcohol with either a straight chain saturated fatty acid having an alkyl group of 5 to 13 carbon atoms or a straight chain unsaturated fatty acid having an alkyl group of 17 to 21 carbon atoms, said films having a kinetic coefficient of friction of 0.1-0.5, a tack strength of 0.4-1.5 kg/cm.sup.2, a haze of less than 5%, a heat shrinkage of 30-80% and an elastic recovery of at least 60%.
Dependencies are inferred from the claim text.