Polymeric timing layer for color transfer assemblages
US4448874A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1983 |
| Grant date | May 15, 1984 |
| Priority date | — |
| Expiry date | Mar 31, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31935
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic assemblages and cover sheets are described employing a timing layer comprising a physical mixture of the following two polymers: PA1 (i) a first polymer comprising from about 5 to about 35 percent by weight of recurring units of an ethylenically unsaturated monomer, from about 0 to about 20 percent by weight of recurring units of an ethylenically unsaturated carboxylic acid, and from about 55 to about 85 percent by weight of recurring units of vinylidene chloride; and PA1 (ii) a second polymer comprising from about 20 to about 70 percent by weight of recurring units of maleic anhydride and from about 80 to about 30 percent by weight of recurring units of a vinyl ester or an alkene; the second polymer being present at a concentration of from about 2 to about 20 percent by weight of the mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.