| abstract |
A block type organopolysiloxane is represented by the following average composition formula (1), n n n n n n n n n n wherein each R 1 independently represents a monovalent hydrocarbon group having 1 to 12 carbons; R 2 represents any of a hydrogen atom, a monovalent hydrocarbon group having 1 to 15 carbons, and a monovalent acyl group having 2 to 7 carbons; R 3 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbons; X represents a divalent hydrocarbon groups having 2 to 15 carbons; “n” represents an integer of 1 or more; “m” represents an integer of 1 or more; “s” represents an integer of 0 to 100; “t” represents an integer of 0 to 50; “z” represents an integer of 0 to 50; each R 4 independently represents a hydrogen atom, a hydroxyl group, an alkoxy group, or an organic group represented by the general formula (2). |