Cationic (meth) acrylic silicone-based graft copolymer and cosmetic containing same
The present invention provides a novel (meth)acrylic silicone-based graft copolymer that is preferably used for cosmetics and the like. The (meth)acrylic silicone-based graft copolymer of the present invention is a copolymer obtained by reacting the following radically polymerizable monomers (a) to (d): (a) a compound represented by the following general formula (I); (b) at least one selected from a compound represented by the following general formula (II) and a compound represented by the following formula (III); (c) a compound represented by the following general formula (IV); and (d) a compound represented by the following general formula (V), wherein the copolymer is dissolved at a level of 50 mass % or more in 99.5% ethanol at 25° C.
1. 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).
2. The (meth)acrylic silicone-based graft copolymer according to claim 1 , which further has a repeating unit derived from a (meth)acrylic derivative other than (a) to (d).
3. The (meth)acrylic silicone-based graft copolymer according to claim 1 , wherein with regard to the ratio of the monomers (a) to (d) used, (a)=20 to 50 mass %, (b)=0.5 to 4 mass %, (c) and (d)=46 to 79.5 mass %, and (c)/(d)=0.5 to 1.5.
4. The (meth)acrylic silicone-based graft copolymer according to claim 1 , wherein when the copolymer is dissolved at a level of 20 mass % in 99.5% ethanol, the viscosity of the ethanol solution at 25° C. is 50 to 250 mPa·s (CS).
5. A cosmetic comprising a (meth)acrylic silicone-based graft copolymer according to any one of claims 1 to 4 .
6. The cosmetic according to claim 5 , which is a hair cosmetic.