Process of vacuum-air pressure drawing of a laminate containing an EVOH/polyamide copolymer
US5068077A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1990 |
| Grant date | Nov 26, 1991 |
| Priority date | — |
| Expiry date | Dec 18, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31928
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A hot drawn multilayered structure including a layer of an ethylene-vinyl alcohol copolymer composition containing 70 to 95 wt % of EVOH having an ethylene content of 25 to 60 mol % and a saponification degree of at least 90%; and 5 to 30 wt % of an aliphatic copolymer polyamide containing capramide as a main structural unit, having a ratio of the number of methylene gorups to the number of amide groups satisfying the equation: EQU 6.6.ltoreq.CH.sub.2 /NHCO.ltoreq.10 having a melting point of 110.degree. to 180.degree. C. and exhibiting a melt index of 0.1 to 10 g/10 mins.; having a thermoplastic resin layer on at least one surface of said layer. The multilayered structure has excellent gas barrier properties and minimized variability in gas barrier properties measured in different areas and minimal gel, hard spots, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.