Gelatin and method of manufacture
US6080843A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1998 |
| Grant date | Jun 27, 2000 |
| Priority date | — |
| Expiry date | Nov 3, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09H3/00
- WIPO fieldBiotechnology
- WIPO sectorChemistry
Abstract
The present invention is a gelatin composed of a high molecular weight fraction (>250,000) of from 0 to 25 wt %, a beta fraction (150,000-250,000) of from 0 to 20 wt % and an alpha fraction (50,000-150,000) of from 15 to 55 wt %. The gelatin has a Gel strength of from 150 to 350 g Bloom and a concentration of protease of greater than 10 ppb and an absorbance of at least 0.069 at 420 nm. The present invention also is a process for the manufacture of photographic gelatin. The process begins by liquefying or slurrying the residual ossein. Protease is added to the gelatin solution or ossein slurry to a concentration of at least 10 ppb to form a mixture. The mixture is reacted for a time sufficient to achieve a viscosity of less than 9 cps (6.16% gel concentration at 104.degree. F.) and the protease is inactivated. The mixture is clarified to form a gelatin solution wherein the gelatin is of high quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.