Patent ID: 7576230

Claim:
A siloxane-based polymer having repeat units of a cyclic Si—O structure, prepared by hydrolyzing and polycondensing at least one multi-functional cyclic siloxane compound of formula (1) alone, or in combination with at least one monomer selected from the group consisting of the compounds of formulas (2)-(5), in an organic solvent in the presence of an acid or alkali catalyst and water: wherein, R 1 is a hydrogen atom, a C 1-3 alkyl group or a C 6-15 aryl group; R 2 is SiX 1 X 2 X 3 (wherein, each of X 1 , X 2 and X 3 is, independently, a hydrogen atom, a C 1-10 alkyl group, a C 1-10 alkoxy group or a halogen atom, provided that at least one of them is hydrolysable); and p is an integer from 3 to 8, wherein, R 1 is a hydrogen atom, a C 1-3 alkyl group or a C 6-15 aryl group; each of X 1 , X 2 and X 3 is, independently, a hydrogen atom, a C 1-3 alkyl group, a C 1-10 alkoxy group or a halogen atom, provided that at least one of them is hydrolysable; m is an integer from 0 to 10; and p is an integer from 3 to 8, X 3 X 2 X 1 Si-M-SiX 1 X 2 X 3 (3) wherein, each of X 1 , X 2 and X 3 is, independently, a hydrogen atom, a C 1-3 alkyl group, a C 1-10 alkoxy group or a halogen atom, provided that at least one of them is hydrolysable; and M is a single bond, a C 1-10 alkylene group, or a C 6-15 arylene group, (R 1 ) a Si(OR 2 ) 4-n (4) wherein, R 1 is a hydrogen atom, a C 1-3 alkyl group, a C 6-15 aryl group or a halogen atom, R 2 is a hydrogen atom, a C 1-3 alkyl group or a C 6-15 aryl group, provided that at least one of them is hydrolysable; and n is an integer from 0 to 3, and wherein, each of R 1 is a hydrogen atom, a C 1-3 alkyl group, a C 1-10 alkoxy group, a hydroxy group or a halogen atom, provided that at least one of them is hydrolysable; and n is an integer from 0 to 30.