Gas-barrier composite film
US6245437A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1999 |
| Grant date | Jun 12, 2001 |
| Priority date | — |
| Expiry date | Jan 19, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31797
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A composite gas barrier film having a layer structure comprises a thermoplastic resin film laminated on at least one side of a film formed from polyglycolic acid containing at least 60 wt. % of a repeating unit represented by the following formula (1): ##STR1## wherein the polyglycolic acid film is a film formed from polyglycolic acid having a melt viscosity, .eta.* of 500 to 100,000 Pa.cndot.s as measured at a temperature of the melting point of the polymer +20.degree. C. and a shear rate of 100/sec, a melting point Tm of at least 150.degree. C., and a melt enthalpy, .DELTA.Hm of at least 20 J/g. An adhesive layer is provided between the polyglycolic acid film and the thermoplastic resin film. The film has excellent oxygen gas barrier property and/or carbon dioxide gas barrier property.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.