Opaque polymeric films cavitated with PBT and polycarbonate
US6500533B1 · kind B1 · utility
12Cited by
11References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2000 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Feb 9, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31938
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for producing an opaque polymeric film comprises:(a) extruding a base layer comprising a polymeric matrix and at least one cavitating agent;(b) coextruding at least one additional layer on at least one side of the base layer;(c) cooling the coextruded multi-layer film; and then(d) orienting the film in at least the machine direction (MD);wherein at least said base layer contains polybutylene terephthalate (PBT) and polycarbonate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.