Packaging materials having excellent gas permeation resistance and process for preparation thereof
US4082854A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1976 |
| Grant date | Apr 4, 1978 |
| Priority date | — |
| Expiry date | Feb 23, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31935
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A packaging material having an improved gas permeation resistance, which comprises at least one layer composed of (A) an 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 one thermoplastic polymer other than said copolymer, said ethylenevinyl alcohol copolymer having a main endothermic peak satisfying substantially the following requirement: EQU Y.sub.1 = 1.64X + 68.0 wherein Y.sub.1 stands for the main endothermic peak temperature (.degree. C.) in the differential thermal analysis, and X stands for the vinyl alcohol content (mole %) in the ethylene-vinyl alcohol copolymer, And at least one subsidary endothermic peak satisfying substantially the following requirement: EQU 0.67 X + 76.7 .gtoreq. Y.sub.2 .gtoreq. 0.40 X + 40.0 preferably EQU 0.67 X + 76.7 .gtoreq. Y.sub.2 .gtoreq. 0.34 X + 88.0 wherein Y.sub.2 stands for the subsidary endothermic peak temperature (.degree. C.) in the differential thermal analysis, and X is as de…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.