Laminated polyester film for use as film with which metal plate is to be laminated
US5885689A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1996 |
| Grant date | Mar 23, 1999 |
| Priority date | — |
| Expiry date | Oct 22, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A laminated polyester film for use as a film to be laminated on a metal plate, which comprises (A) a first layer formed of (a1) a first aromatic copolyester prepared in the presence of a germanium compound as a polymerization catalyst, which contains terephthalic acid as the main dicarboxylic acid component and ethylene glycol as the main glycol component and which has a melting point in the range of from 210.degree. to 245.degree. C. and a glass transition temperature of at least 60.degree. C., the first layer having (a2) a surface roughness (Ra) in the range of from 2 to 13 nm, and (B) a second layer formed of (b1) a polyester composition obtained by melt-mixing 90 to 45% by weight of a second aromatic copolyester which is composed, as a main recurring unit, of ethylene terephthalate, is produced in the presence of a germanium compound as a polymerization catalyst and has a melting point in the range of from 210.degree. to 252.degree. C. and 10 to 55% by weight of a third aromatic polyester which is composed, as a main recurring unit, of tetramethylene terephthalate and has a melting point in the range of from 180.degree. to 223.degree. C., the second layer having (b2) a surface …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.