Patent ID: 6727335
Filing Date: 2004-04-27
Classification: C07F

Abstract:
A process for preparing polymeric phosphinic acids and their slats of the formula(I): in whichX is hydrogen or a 1/m metal of valency m, R1 and R2 are identical or different and are hydrogen, a carboxyl group, a carboxylic acid derivative, an unsubstituted or substituted alkyl group having 1 to 10 carbon atoms, phenyl, benzyl or alkyl-substituted aromatics, R3 and R4 are identical or different and are hydrogen or a vinyl group of the formula (VI) â€”CR1&boxH;CHR2â€ƒâ€ƒ(VI) in which R1 and R2 have the abovementioned meaning, and{overscore (u)} is the average number of monomer units, comprising the step of reacting hypophosphorous acid and/or its alkali metal salts with acetylenes of the formula (II) R1â€”Câ‰¡Câ€”R2â€ƒâ€ƒ(II) in which R1 and R2 are identical or different and are hydrogen, a carboxyl group, a carboxylic acid derivative, an unsubstituted or substituted alkyl group having 1 to 10 carbon atoms, phenyl, benzyl or alkyl-substituted aromatics.