A block type organopolysiloxane is represented by the following average composition formula (1),wherein each R1 independently represents a monovalent hydrocarbon group having 1 to 12 carbons R2 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 R3 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 R4 independently represents a hydrogen atom, a hydroxyl group, an alkoxy group, or an organic group represented by the general formula (2).
