Packaging materials having barrier coatings based on water-epoxy resin copolymers
US6777088B2 · kind B2 · utility
3Cited by
12References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 1, 2002 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Sep 12, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31938
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A multilayer packaging material comprising(a) at least one layer of a gas-permeable material, and(b) at least one layer of a gas-barrier coating comprising a polymeric polyol made by copolymerizing a multifunctional epoxide resin and water in the presence of an amount of acid effective for polymerizing the epoxide resin and the water, the amount of water being sufficient to avoid gelation, the polymeric polyol optionally reacted with a crosslinking agent for hydroxyl functionality, especially an amino resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.