Polyester films and devices containing them
US11701869B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 2018 |
| Grant date | Jul 18, 2023 |
| Priority date | — |
| Expiry date | Jul 30, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04103
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A thermoformable biaxially oriented coextruded polyester film comprising a copolyester base layer B, a first polyester outer layer A1 and a second polyester outer layer A2, wherein said outer layers are disposed on opposite surfaces of said base layer, and wherein: (i) said base layer B comprises a copolyester derived from terephthalic acid (TA) and a second aromatic dicarboxylic acid and one or more diol(s), wherein said second aromatic dicarboxylic acid is present in the copolyester in an amount of from about to 5 about 20 mol % of the acid fraction of the copolyester; (ii) the polyester of each of said outer layers A1 and A2 is selected from polyethylene terephthalate (PET); and (iii) the thickness of the base layer constitutes at least 90% of the total thickness of the coextruded multi-layer polyester film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.