Copolyamide active-passive oxygen barrier resins
US6506463B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2000 |
| Grant date | Jan 14, 2003 |
| Priority date | — |
| Expiry date | Feb 11, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31725
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Compositions for scavenging oxygen are disclosed. These compositions comprise copolyamides comprising over 50 weight percent polyamide segments and an active oxygen scavenging amount of polyolefin oligomer segments. The polyamide segments comprise segments derived from typical bottling and packaging polyamides such as polyhexamethyleneadipamide and polyphthalamides. The copolymers are preferably formed by transesterification during reactive extrusion and typically comprise about 0.5 to about 12 wt. % of polyolefin oligomer segments. The copolyamides provide enhanced active and passive oxygen barrier properties over similar polyester constructions and similar polyamide constructions, when used in a laminar construction. In a series of preferred embodiments, multi-layered bottles fabricated with the oxygen scavenging copolyatnides of this invention are about 99.8 wt. % polyamide and suitable for recycle with other polyamide bottles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.