Opaque molecularly oriented and heat set linear polyester film and process for making same
US3944699A · kind A · utility
87Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1973 |
| Grant date | Mar 16, 1976 |
| Priority date | — |
| Expiry date | Oct 19, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31797
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Opaque voided films having a total luminous transmission not exceeding 25% are made from blends of a polyester preferably polyethylene terephthalate, with 3 to 27% of an ethylene or propylene polymer, prepared by dry blending. One end use of the film, as a base for photographic prints is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.