Method for the maufacture of a recording material including gelatin
US5264339A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1992 |
| Grant date | Nov 23, 1993 |
| Priority date | — |
| Expiry date | Sep 4, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/136
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a method for the manufacture of a recording material containing a coated and dried gelatin containing layer on a support, the improvement wherein such layer is coated from an aqueous coating composition containing: PA0 (1) hydrophilic colloid matter consisting of at least 90% by weight of gelatin, PA0 (2) not more than 5% by weight with respect to the total gelatin content of a thickening agent increasing the viscosity of said composition, and PA0 (3) a hardening agent for gelatin that reduces its water-solubility after coating, characterized in that said gelatin is a gelatin species which as a 10% by weight aqueous solution at 36.degree. C. and pH 6 has a viscosity of at least 35 Mpa.s at a shear rate of 1000 S.sup.-1 and shows a decrease in viscosity by at least 10 Mpa.s at a shear rate of 40,000 s.sup.-1, and as a 3% by weight aqueous solution at Ph 6 and after cooling for 30 seconds at a shearing rate of 208 s.sup.-1 has a solidification time of less than 20 seconds and a consistency characteristic corresponding with a viscosity of more than 500 Mpa.s determined under the test conditions of Test S described in the specification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.