C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
18/1170, 400/300
C08F 216/06 (2006.01) B29C 49/22 (2006.01) B32B 27/08 (2006.01) B32B 27/30 (2006.01) B65D 65/38 (2006.01) C08J 5/18 (2006.01)
Patent
CA 1091848
Abstract of the Disclosure A packaging material having an improved gas per- meation resistance, which comprises ot least one layer composed of (A) on ethylene-vinyl alcohol copolymer having a vinyl alcohol content of 50 to 75 mole % and a residual vinyl ester content of up to 4 mole % based on the sum of the vinyl alcohol and vinyl ester or (B) a blend of said ethylene-vinyl alcohol copolymer with up to 150 % by weight, based on said copolymer, of at least on thermop- lastic polymer other than said copolymer, said ethylene- vinyl alcohol copolymer having a main endothermic peak satisfying substantially the following requirement: Y1 = 1.64X + 68. wherein Y1 stands for the main endothermic peak temperature (°C.) in the differential thermal analysis, and X stand for the vinyl alcohol content ( mole % ) in the ethylene-vinyl alcohol copolymer, and at least one subsidary endothermic peak satisfying substantially the following requirement: 0.67 X + 76.7 ? Y2 ? 0.40 X + 40.0 preferably 0.67 X + 76.7 ? Y2 ? 0.34 X + 88.0 wherein Y2 stands for the subsidary endothermic peak temperature (°C.) in the differential thermal analysis, and X is as defined above, the ratio ( Rs ) of the subsidary endothermic peak area to the main endothermic peak area being at least 2.5 %.
246881
Hirata Sadao
Hirata Shunsaku
Kano Fumio
Kishimoto Akira
Suzuki Toru
Smart & Biggar
Toyo Seikan Kaisha Limited
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