Method for producing biaxially stretched film made of ethylene-vinyl alcohol copolymer
US6699418B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2002 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | Feb 14, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31935
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for producing a biaxially stretched film is provided, in which the method comprises, stretching a film made mainly of an ethylene-vinyl alcohol copolymer having an ethylene content of 15 to 70 mol % and a saponification degree of 80 mol % or more under heating; cooling the film; and subjecting the cooled film to a heat treatment; wherein a heating temperature during the stretching is 60 to 160° C., a cooling temperature is a temperature 30 to 100° C. lower than the heating temperature during the stretching, and a temperature for the heat treatment is 150 to 190° C. The thus obtained biaxially stretched film of the present invention has a small bowing coefficient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.