Skin Cosmetic

Abstract

A skin cosmetic which exerts a feeling of ameliorating effect on skin wrinkles and sagging by application, and is free from uncomfortable feelings in use, such as stickiness, twisting of the cosmetic applied on the skin, and squeakiness. The cosmetic comprises an aqueous liquid of an anionic or amphoteric urethane resin dissolved or dispersed in water and wherein the anionic or amphoteric urethane resin is prepared by reacting (a) an isocyanate compound with (b) a polyol compound containing the following components (b-1) to (b-3) or the following components (b-1) to (b-4) and having a ratio of (b-1)/(b-2) of 0.15-3.0 (by mass, in terms of charge): [(b-1): cyclohexanedimethanol, (b-2): polypropylene glycol having a molecular weight of 1000-3000, (b-3): a compound having an active hydrogen and a carboxyl group in one molecule, (b-4): a compound having an active hydrogen and a tertiary amino group in one molecule.]

What is claimed is: 
     
         1 . A skin cosmetic comprising an aqueous liquid of an amphoteric urethane resin dissolved or dispersed in water, wherein the amphoteric urethane resin is prepared by reacting as starting monomers
 (a) an isocyanate compound with   (b) a polyol compound containing the following components (b-1) to (b-4) and having a ratio of component (b-1) to component (b-2) by mass in terms of charge of from 0.15 to 3.0:
 (b-1). cyclohexanedimethanol, 
 (b-2). polypropylene glycol having a molecular weight of from 1000 to 3000, 
 (b-3). a compound having an active hydrogen and a carboxyl group in one molecule, 
 (b-4). a compound having an active hydrogen and a tertiary amino group in one molecule. 
   
     
     
         2 . The skin cosmetic according to  claim 1 , wherein the amphoteric urethane resin includes a structural unit derived from ethylene oxide. 
     
     
         3 . The skin cosmetic according to  claim 1 , wherein the amount of the aqueous dispersion of amphoteric urethane resin in the skincare preparation is from about 0.1% to about 5% by mass. 
     
     
         4 . The skin cosmetic according to  claim 2 , wherein the amount of the aqueous dispersion of amphoteric urethane resin in the skincare preparation is from about 0.1% to about 5% by mass. 
     
     
         5 . The skin cosmetic according to  claim 1 , wherein a charge ratio of component (b-1) to component (b-2) is from 0.2 to 2.5 by mass. 
     
     
         6 . The skin cosmetic according to  claim 1 , wherein component (b-1) comprises 1,4-cyclohexanedimethanol. 
     
     
         7 . The skin cosmetic according to  claim 1 , wherein component (b-3) comprises at least one of dimethylolpropionic acid (DMPA), dimethylolbutanoic acid (DMBA), and carboxyl group-containing polycaprolactonediol. 
     
     
         8 . The skin cosmetic according to  claim 1 , wherein component (b-4) comprises an N-alkyldialkanolamine compound. 
     
     
         9 . The skin cosmetic according to  claim 8 , wherein the N-alkyldialkanolamine compound comprises at least one of N-methyldiethanolamine (NMDEtA), N-butyldiethanolamine, and dimethylaminoethanol. 
     
     
         10 . The skin cosmetic according to  claim 1 , wherein in preparing the amphoteric urethane resin, a charge ratio of component (a) is from about 30% to about 70% by mass of the starting monomers. 
     
     
         11 . The skin cosmetic according to  claim 10 , wherein in preparing the amphoteric urethane resin, a charge ratio of component (b-1) and (b-2) is from about 20% to about 60% by mass of the starting monomers; a charge ratio of component (b-3) is from about 5% to about 25% by mass of the starting monomers; and a charge ratio of component (b-4)) is from about 0.5% to about 5.0% by mass of the starting monomers. 
     
     
         12 . The skin cosmetic according to  claim 2 , wherein the amphoteric urethane resin includes a structural unit derived from propylene oxide. 
     
     
         13 . The skin cosmetic according to  claim 12 , wherein a ratio of the structural unit derived from ethylene oxide to the structural unit derived from propylene oxide is from about 10:0 to 2:8 by mass. 
     
     
         14 . The skin cosmetic according to  claim 1 , wherein in preparing the amphoteric urethane resin, component (b) further comprises a component (b-5) at a charge ratio of from about 1.0% to about 10.0% by mass of the starting monomers, component (b-5) comprising a polyethylene oxide derivative having an active hydrogen. 
     
     
         15 . The skin cosmetic according to  claim 14 , wherein component (b-5) comprises at least one of polyoxyethylene glycol (PEG) and polyoxyethylene polyoxypropylene glycol(EO/PO block copolymer). 
     
     
         16 . The skin cosmetic according to  claim 14 , wherein a molecular weight of component (b-5) is from about 200 to about 20,000. 
     
     
         17 . The skin cosmetic according to  claim 1 , wherein the starting monomers of the amphoteric urethane resin further comprise a polysiloxane compound having a recurring number of siloxane bonds (Si—O) from about 5 to about 300 at a charge ratio of from about 0.1% to about 5.0% by mass of the starting monomers. 
     
     
         18 . The skin cosmetic according to  claim 17 , wherein the polysiloxane compound comprises at least one of polydialkylsiloxane-diol, polydialkylsiloxane-monool, polydialkylsiloxane-diamine, and polydialkylsiloxane-monoamine. 
     
     
         19 . The skin cosmetic according to  claim 1 , wherein the aqueous liquid of an amphoteric urethane resin dissolved or dispersed in water has a solids concentration of from about 5.0% to about 30.0% by mass. 
     
     
         20 . The skin cosmetic according to  claim 1 , wherein the amphoteric urethane resin includes from about 3 to about 300 repeating structural units derived from ethylene oxide.