Polyester film for lamination onto metal sheet for processing of said sheet, and use thereof
US5384354A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1993 |
| Grant date | Jan 24, 1995 |
| Priority date | — |
| Expiry date | Sep 15, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31681
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention provides a polyester film for processing of a metal sheet, which shows excellent molding-processability when it is laminated onto a metal sheet and the laminated metal sheet is made into a can by deep drawing or the like and which is suitable and useful for production of a metal can having excellent heat resistance, impact resistance and flavor-retaining property. A polyester film used for lamination onto a metal sheet for processing of said metal sheet, characterized in that the film is formed from 99 to 60% by weight of a copolyester, as the component A, having an ethylene terephthalate unit as the main recurring unit and having a melting point of 210 to 245.degree. C. and 1 to 40% by weight of a polybutylene terephthalate or a copolyester, as the component B, having a butylene terephthalate unit as the main recurring unit and having a melting point of 180 to 223.degree. C., and further comprising a lubricant having an average particle diameter of 2.5 .mu.m or less; and that the film has a plane orientation coefficient of 0.08 to 0.16, a heat shrinkage at 150.degree. C. of 10% or less and a density of less than 1.385 g/cm.sup.3 : and use thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.