Packaging materials having excellent gas permeation resistance and process for preparation thereof
CA 1091848 A · Owner: Toyo Seikan Kaisha Limited · Inventors: Hirata, Shunsaku; Kano, Fumio; Suzuki, Toru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A packaging material having an improved gas permeation 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 thermoplastic 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 …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted December 16, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 16, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.