Composite polyester films and their use as protective layers for photopolymer plates, and photopolymer plates comprising said films
US5294474A · kind A · utility
6Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1992 |
| Grant date | Mar 15, 1994 |
| Priority date | — |
| Expiry date | Feb 26, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The invention relates to semicrystalline biorientated composite polyester films comprising a thick filled or unfilled layer and, on at least one of the faces of the layer (A), a coextruded polyester layer (B) whose thickness is less than that of the layer (A) and which has the following characteristics: PA1 Rt.ltoreq.3 .mu.m PA1 Rt/Ra.ltoreq.10 and contains a filler having the following characteristics: PA1 mean diameter D 50=1.5 to 2.5 .mu.m PA1 monodispersity I=D 75-D 25.ltoreq.1.2 These films can be used as protective sheets for the photopolymerizable layer of photopolymerizable elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.