US Patent 7851562 Water-soluble silicon-containing polymer, making method, coating composition, and coated article

A water-soluble silicon-containing polymer is provided comprising recurring units having formula (1) wherein 10≦m≦260, 1≦n≦100, X is an alkylene chain which may have an alkyl substituent, R is H, alkyl or acetyl, and “a”=1, 2 or 3. The polymer has more than one primary amino group per hydrolyzable silyl group, affording an increased number of reaction sites with organic resins and forming a firm bond therewith.