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US 5,710,327 AGranted
Preparation of modified polyaspartic acids
AssigneeBASF SE
InventorsMatthias Kroner, Gunnar Schornick
Life of this patent
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Abstract
Modified 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.degree. C. in the absence of inorganic acids.
Claims3
A process for preparing modified polyaspartic acids, which comprises cocondensing aspartic acid with
- (a) polybasic carboxylic acids or anhydrides of polybasic carboxylic acids and
- (b) ammonia without diluent at temperatures of at least 140.degree. C. in the absence of inorganic acids, and hydrolyzing the cocondensates with alkali metal and/or alkaline earth metal bases in aqueous medium.
Dependencies are inferred from the claim text.