Preparation of modified polyaspartic acids

摘要

PCT No. PCT/EP95/03621 Sec. 371 Date Mar. 27, 1997 Sec. 102(e) Date Mar. 27, 1997 PCT Filed Sep. 14, 1995 PCT Pub. No. WO96/10050 PCT Pub. Date Apr. 4, 1996Modified polyaspartic acids are prepared by condensing aspartic acid with polybasic carboxylic acids or anhydrides of polybasic carboxylic acids and ammonia without a diluent at temperatures of at least 140 DEG C. in the absence of inorganic acids.