Patent ID: 7001673

Claim:
A polymer compound having weight average molecular weight of 1,000 to 100,000 and comprising: i) a polymer structure represented by —(CHR 3 —CR 4 (-L 1 -Y 1 )) x —(CHR 5 —CR 6 (-L 2 -Y 2 )) y —; and ii) a silane coupling group represented by —S—(CH 2 ) n —Si—(R 1 ) m (OR 2 ) 3-m , as a terminal of the polymer structure, wherein R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 each independently represents a hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms; m represents 0, 1 or 2; n represents an integer of 1 to 8; x is 100 to 1 mol %; y is 0 to 99 mol %; x+y=100 mol %; L 1 and L 2 each independently represents a single bond or an organic connecting group; and Y 1 and Y 2 each independently represents —N(R 7 )(R 8 ), —OH, —NHCOR 7 , —COR 7 , —CO 2 M, or —SO 3 M, wherein R 7 and R 8 each independently represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms and M represents a hydrogen atom, an alkali metal, an alkaline earth metal, or an onium.