Oxygen barrier coating and coated film
US6709735B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2002 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Dec 9, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31891
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A film with excellent oxygen barrier properties is disclosed. A barrier coating used thereon is also disclosed, including polyvinyl alcohol and a copolymer of maleic acid and acrylic acid, and wherein the copolymer of maleic acid and acrylic acid has a weight average molecular weight of about 3500 to about 5000. The barrier coating is typically less than about 1 micrometer in thickness and provides an oxygen barrier of less than about 0.3 cc.mil/100 in2/day/atm when tested at 23 degrees Celsius and 0 percent relative humidity according to ASTM D3985. A method of stripping low molecular eight fractions from the copolymer is also disclosed. Metallized coated film according to the present invention shows surprising barrier properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.