Sanofi

Systems Bio Industries

Georges Takerkart

Sylviane Dumas

Jacques Moy

A process for the preparation of gelatin from powdered bone, which consists in subjecting the powdered bone to a first treatment with an acid solution at a temperature below ambient temperature in order to solubilize the phosphates, and then to a second treatment with an acid solution at a temperature of between 60.degree. C. and 85.degree. C. in order to isolate a broth from which the gelatin is extracted. Type A gelatin with a gel strength of more than 300 blooms and a gelling time of less than 100 seconds.

Continuous process for the preparation of gelatin from powdered bone,

The present invention relates to modified gelatin containing polyfluorinated substituents grafted on to the protein chain. It further relates to the process for the preparation of this modified gelatin, which consists in reacting a polyfluorinated derivative containing a group capable of reacting with the OH or NH.sub.2 groups of the gelatin in aqueous solution. Application: photographic film preparations.

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Isle-sur-Sorgue, France

Georges Takerkart