Water Soluble Thickener And Cosmetic Preparation Containing Same
AssigneeShiseido Company, Ltd.
InventorsAtsushi Sogabe, Isamu Kaneda
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Abstract
The invention is a water-soluble thickener made of a copolymer that is obtained by copolymerizing 2-acrylamido-2-methylpropanesulfonic acid or its salt, hydroxyethylacrylamide, and a crosslinking monomer, or that is made of a copolymer that is obtained by further neutralizing said copolymer that has been obtained using an alkaline agent. It also provides a cosmetic in which this water-soluble thickener has been blended. It is an object of the invention to provide, as a water-soluble thickener, a copolymer which, when blended into a cosmetic, demonstrates a sufficiently satisfactory degree of usability and is excellent in terms of stability and safety.
Claims9
1-4. (canceled)
A cosmetic comprising a water-soluble thickener,
- wherein said water-soluble thickener is comprised of a copolymer obtained through a homogenous polymerization by copolymerizing 2-acrylamido-2-methylpropanesulfonic acid or its salt, hydroxyethylacrylamide, and a cros slinking monomer of N,N′-methylenebisacrylamide, and wherein an 0.5 wt % aqueous solution of said copolymer has a viscosity ranging between 4,300 and 4,600 mPas over a pH range of from 2 to 10.
A cosmetic comprising a water-soluble thickener, wherein said water-soluble thickener is comprised of a copolymer obtained through a homogenous polymerization by:
- (a) copolymerizing 2-acrylamido-2-methylpropanesulfonic acid or its salt, hydroxyethylacrylamide, and a crosslinking monomer of N,N′ methylenebisacrylamide, so as to form a copolymer;
- and
- (b) neutralizing said copolymer using an alkaline agent, and wherein an 0.5 wt % aqueous solution of said copolymer has a viscosity ranging between 4,300 and 4,600 mPas over a pH range of from 2 to 10.
Dependencies are inferred from the claim text.