Patent ID: 8901265

Claim:
A (meth)acrylic silicone-based graft copolymer obtained by reacting the following radically polymerizable monomers (a), (b), (c) and (d), wherein the (meth)acrylic silicone-based graft copolymer is dissolved at a level of 50 mass % or more in 99.5% ethanol at 25° C.: (a) a compound represented by the following general formula (I): (wherein Me represents a methyl group, R1 represents a hydrogen atom or a methyl group, R2 represents a linear or branched divalent saturated hydrocarbon group containing 1 to 10 carbon atoms, which optionally comprises one or two ether bonds, R3 represents a saturated hydrocarbon group containing 1 to 10 carbon atoms, and m represents an integer of 5 to 100); (b) at least one selected from a compound represented by the following general formula (II): (wherein R4 represents a hydrogen atom or a methyl group, R5, R6 and R7, which are the same or different, each represent a hydrogen atom or an alkyl group containing 1 to 4 carbon atoms, X represents —O—, —NH—, —O—CH 2 — or —O—CH 2 CH(OH)—, Y represents a linear or branched divalent saturated hydrocarbon group containing 1 to 4 carbon atoms, and Z − represents a counter anion), and a compound represented by the following formula (III): (wherein R8 and R9, which are the same or different, each represent a hydrogen atom or an alkyl group containing 1 to 4 carbon atoms, R10 and R11, which are the same or different, each represent a hydrogen atom or an alkyl group containing 1 to 18 carbon atoms, and Z − represents a counter anion); (c) a compound represented by the following general formula (IV): (wherein R12 represents a hydrogen atom or a methyl group, and R13 represents a hydrogen atom or a linear or branched alkyl group containing 1 to 3 carbon atoms); and (d) a compound represented by the following general formula (V): (wherein R14 represents a hydrogen atom or a methyl group, and R15 represents a hydroxyalkyl group containing 1 to 4 carbon atoms).