Production of iodine stainable polyester polarizer film
US4659523A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1984 |
| Grant date | Apr 21, 1987 |
| Priority date | — |
| Expiry date | Nov 30, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2429/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for preparing an iodine stainable polyester polarizer film which comprises: PA1 (a) extruding a moving molten web of polyester film; and PA1 (b) quenching said moving web to solidify it in a substantially amorphous form; and PA1 (c) applying an anchor coating to at least a portion of the surface of said film wherein said anchor coating improves adhesion of polyvinyl alcohol to polyester film; and PA1 (d) applying a coating of a dispersed aqueous composition of polyvinyl alcohol to at least a portion of the surface of said film; and PA1 (e) stretching said moving web in a direction transverse to the direction of motion while heating said web at a temperature of from about its glass transition temperature to about 160.degree. C.; and PA1 (f) crystallizing said moving web by heating it to a temperature in the range of 130.degree. C. to 240.degree. C. without stretching said web; and PA1 (g) cooling said web to substantially ambient atmospheric temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.