Copolyamides
US5723567A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1995 |
| Grant date | Mar 3, 1998 |
| Priority date | — |
| Expiry date | Sep 28, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31721
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A partially aromatic copolyamide is formed of: PA1 (a) 5 to 30 weight-% of hexamethylene diamine PA1 (b) 10 to 40 weight-% of metaxylylene diamine PA1 (c) 15 to 50 weight-% of adipic acid PA1 (d) 5 to 45 weight-% of at least one aliphatic dicarboxylic add with 7 to 10 carbon atoms, preferably sebacic acid and/or acelaic acid, wherein the components (a) to (d) add up to 100 weight-%, and the add groups and the amine groups are essentially present in equimolar portions. These novel copolyamides are used for producing barrier layers for mono- or multi-layered composites, such as foils or containers, infusion- or ostomy bags, shrink wraps for meat, fish and cheese packagings or sausage skins, wherein the copolyamides can be present in the pure form or as a mixture with other polymers, in particular in combination with further polymer layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.