Patent ID: 6900251

Claim:
Acrylic ester phosphonic acid of formula (I), stereoisomers thereof and mixtures of these, in which n is 1 or 2, on the condition that for n=1 R 1 has the meaning and for n=2 R 1 has the meaning R 2 is a C 1 to C 12 alkylene radical, C 4 -C 8 cycloalkylene radical or C 7 to C 15 alkylene phenylene radical; R 3 is hydrogen, a C 1 to C 5 alkyl radical or a C 1 to C 5 O-alkyl radical; and R 4 , R 5 independently of each other, each stand for a C 1 to C 5 alkyl radical or a C 1 to C 5 O-alkyl radical.