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AssigneeKureha Kagaku Kogyo Kabushiki Kaisha
InventorsNobuyuki Hisazumi, Masataka Yamamoto, Tsutomu Uehara
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A laminated packaging material having high impermeability to gases and high workability is prepared by the lamination of a layer of copolymer of vinylidene chloride containing 3-10% by weight of a plasticizer of a number average molecular weight of less than 500 with another layer of a synthetic resin containing 5-70% by weight of at least one organic additive of a number average molecular weight of about 800-10,000 and selected from the group consisting of glycerides of higher saturated or unsaturated fatty acids and of epoxidized fatty acids, rosin and rosin derivatives, oligomeric copolymers of styrene with isobutylene, butadiene or isoprene, oligomeric polyesters which are formed by polycondensation of aliphatic dicarboxylic acid with 6-10 carbon atoms and polyhydric alcohol with 2-6 carbon atoms and have a number average molecular weight of 1,000-2,000, and oligomeric epoxides formed by polycondensation between epichlorhydrin and bisphenol.
A laminated material having high workability and gas-impermeability, prepared by laminating a layer of a copolymer of vinylidene chloride containing 3 to 10% by weight of a plasticizer having a molecular weight of less than 500 and a carrier layer of a synthetic resin carrying 5 to 70% by weight of at least one organic additive having a number average molecular weight in the range of 800 to 10,000 showing a melting point of lower than that of said copolymer of vinylidene chloride and selected from the group consisting of glycerides of higher saturated or unsaturated fatty acids or of higher saturated or unsaturated epoxidized fatty acids, rosin and derivatives thereof, oligomeric copolymers of styrene with isobutylene, butadiene or isoprene, oligomeric polyesters formed by polycondensation of an aliphatic dicarboxylic acid with 6 to 10 carbon atoms and a polyhydric alcohol with 2 to 6 carbon atoms and have a number average molecular weight of 1,000 to 2,000 and oligomeric epoxides formed by polycondensation of epichlorhydrin and bisphenol.
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