Matte, coextruded polyester film, its use and process for its production
US6358604B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1999 |
| Grant date | Mar 19, 2002 |
| Priority date | — |
| Expiry date | Jul 26, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31797
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The invention relates to a biaxially oriented polyester film with a base layer at least 80% by weight of which is composed of a thermoplastic polyester, and with at least one matte outer layer which comprises a mixture or a blend of two components I and II wherein components I and II render the at least one outer layer matte. The invention further relates to the methods for use of the film and to a process for its production. Component I of the mixture or of the blend is a polyethylene terephthalate homopolymer or polyethylene terephthalate copolymer or a mixture of homo- or copolymers. Component II of the mixture or of the blend is a polyethylene terephthalate copolymer which is composed of the condensation product of the following monomers and/or of their derivatives capable of forming polyesters: isophthalic acid, aliphatic dicarboxylic acid, sulfomonomers and aliphatic or cycloaliphatic glycols. The outer layer according to the invention has a characteristic matte surface and/or appearance and is highly suitable for use as a packaging film, specifically for packaging foods and other consumable items, and for laminating, metallizing and printing, or for applications in the indus…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.