Process for the preparation of polycondensates of amino acids and the biodegradable polypeptide hydrolysates thereof, and their use in detergent compositions
AssigneeRhone-Poulenc Chimie
InventorJean-Luc Lepage
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Abstract
Process for the preparation of polycondensates of amino acids or of the polypeptide hydrolysates thereof, by bulk thermal polycondensation of amino acids in pulverulent medium, in the presence of phosphoric acid, phosphorus pentoxide or polyphosphoric acid (catalyst) which is uniformly distributed in the said pulverulent medium, optionally followed by hydrolysis. The said pulverulent medium may be obtained by empasting the amino acid and the catalyst with water, removal of the water and grinding. Use of polyimide polycondensates or the polypeptide hydrolysates thereof in detergent compositions.
Claims7
A process for the preparation of polycondensates of amino acids or of the polypeptide hydrolysates thereof comprising preparing said polycondensates by bulk thermal polycondensation of amino acids in the presence of a polycondensation catalyst, of phosphoric acid, phosphorus pentoxide or polyphosphoric acid optionally followed by hydrolysis, the said polycondensation process being performed in pulverulent medium containing, per mole of amino acid, from 0.005 to 0.25 mole of catalyst uniformly distributed in the said medium.
Dependencies are inferred from the claim text.