Patent ID: 8759323

Claim:
A silicon compound represented by the formula (2) or a salt thereof: wherein R 4 and R 5 are the same or different and represent a hydrogen atom or (R 1 )(R 2 )(R 3 )Si—, wherein at least one of R 4 and R 5 is (R 1 )(R 2 )(R 3 )Si—; R 1 , R 2 , and R 3 are the same or different and represent a hydrocarbon group having 1 to 12 carbon atoms; R 6 represents a hydrogen atom or optionally forms —O-(ether bond) together with the hydroxyl group of R 8 ; and R 7 represents a hydrogen atom and R 8 represents a hydroxyl group, or R 7 and R 8 optionally together form an oxo group (═O).