Polyester film with coating
US11752678B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2019 |
| Grant date | Sep 12, 2023 |
| Priority date | — |
| Expiry date | Feb 10, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2203/16
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A transparent, single- or multilayer, biaxially oriented polyester film with reduced oxygen transmission rates, having a barrier coating on at least one film surface, where the barrier coating is the drying product of an aqueous coating dispersion or aqueous coating solution, that includes at least one polyanion and at least one polyethyleneimine, where the polyanion has neutralized acid groups which are carboxylate, phosphate and/or sulfate groups, and the dry thickness d of the coating is in the range of 15 nm≤d<200 nm. The biaxially oriented, coated polyester film has transparency≥88% and oxygen permeation lower at least by a factor of two than that of the uncoated biaxially oriented film. A process for the production of the biaxially oriented, coated polyester film, and also its use as oxygen-barrier film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.