Patent ID: 7851562

Claim:
A method for preparing a water-soluble silicon-containing polymer comprising recurring units having the general formula (2): wherein m is a number from 10 to 260, n is a number from 1 to 100, x is a C 1 -C 10 alkylene chain which may be substituted with a C 1 -C 6 alkyl group, R is hydrogen, a C 1 -C 4 alkyl group or acetyl group, R′ is hydrogen or methyl, and “b” is an integer of 1 to 3, said polymer having a plurality of primary amino groups and a hyrolyzable silyl or silanol group, and having an average molecular weight of 300 to 3,000, said method comprising the steps of: reacting a water-soluble primary amino group containing polymer having the general formula (3): wherein m and n are as defined above, with a silicon compound having the general formula (5): CH 2 ═CR′—COO—X—Si(OR) b (CH 3 ) 3-b (5) wherein X, R, R′, and “b” are as defined above, in an alcohol and/or water.