Patent ID: 6080843
Filing Date: 2000-06-27
Classification: C09H,C12P

Abstract:
A process for the manufacture of photographic gelatin comprising:liquefying or slurrying residual ossein;adding protease to the liquefied or slurried ossein at a concentration of at least 10 ppb to form a mixture;reacting the mixture for a time sufficient to achieve a viscosity less than 9 cp;inactivating the protease to produce gelatin in solution wherein the gelatin comprises 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 %, an alpha fraction (50,000-150,000) of from 15 to 55 wt %, and an absorbance of greater than 0.069 at 420 nm.