Aqueous hydrophilic colloid coating composition containing a combination of anionic surfactants
US4370412A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1978 |
| Grant date | Jan 25, 1983 |
| Priority date | — |
| Expiry date | Sep 14, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S516/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A combination of two anionic surfactants, one of which is an alkyl sulfate surfactant, such as sodium dodecyl sulfate, and the other of which is an N-acyl sarcosinate surfactant, such as sodium lauroyl sarcosinate, is used as a coating aid in aqueous coating compositions comprising a hydrophilic colloid. The combination of surfactants provides a coating composition which combines the advantage of good wetting or spreading characteristics with the advantage of excellent ability to avoid repellency defects. Such coating compositions are especially useful in the coating of gelatin silver halide emulsion layers or other hydrophilic colloid layers in photographic materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.