Rheology modifier/hair styling resin

Abstract

A rheology modifier/hair styling resin which is a crosslinked, linear poly(vinyl amide/polymerizable carboxylic acid) copolymer exhibits advantageous hair care properties of high viscosity and long-lasting curl retention.

1 . A rheology modifier/hair styling resin comprising a crosslinked, linear poly(vinyl amide/polymerizable carboxylic acid) copolymer.  
   
   
       2 . A rheology modifier/hair styling resin according to  claim 1  wherein said vinyl amide is selected from vinyl pyrrolidone, vinyl caprolactam, N-vinyl formamide, N-vinylacetamide, N-vinyl-N-methylacetamide and mixtures thereof.  
   
   
       3 . A rheology modifier/hair styling resin according to  claim 2  wherein said vinyl amide is vinyl pyrrolidone.  
   
   
       4 . A rheology modifier/hair styling resin according to  claim 1  wherein said polymerizable carboxylic acid is selected from (meth)acrylic acid, crotonic acid, itaconic acid, maleic acid and mixtures thereof.  
   
   
       5 . A rheology modifier/hair styling resin according to  claim 4  wherein said polymerizable carboxylic acid is acrylic acid.  
   
   
       6 . A rheology modifier/hair styling resin according to  claim 1  wherein said crosslinker has at least two free radical polymerizable groups in the molecule.  
   
   
       7 . A rheology modifier/hair styling resin according to  claim 6  wherein said crosslinker is selected from pentaerythritol triallylether, pentaerythritol triacrylate, pentaerythritol tetraacrylate and methylene bisacrylamide.  
   
   
       8 . A rheology modifier/hair styling resin according to  claim 1  wherein said vinyl amide is present, by weight, in an amount of 1-99%, said polymerizable carboxylic acid in an amount of 1-99%, and said crosslinker in an amount of 0.2-3%, based on weight of total monomers.  
   
   
       9 . A rheology modifier/hair styling resin according to  claim 8  wherein said vinyl amide is present in an amount of 20-80%, said polymerizable carboxylic acid in an amount of 20-80%, and said crosslinker in an amount of 0.4-2%.  
   
   
       10 . A rheology modifier/hair styling resin according to  claim 1  which includes an optional monomer selected from lauryl (meth)acrylate, stearyl (meth)acrylate, alkyl (meth)acrylamide and alkyl (meth)acrylate, where alkyl is C 1 -C 30  or polyethylene oxide.  
   
   
       11 . A process of making the rheology modifier/hair styling resin of  claim 1  which comprises precipitation polymerizing, by wt., 5-50% of a reaction, mixture of 1-99% of a vinyl amide and 1-99% of a polymerizable carboxylic acid, and 0.2-3% of a crosslinker, based on total monomers, in 50-95% of a non-polar removable organic solvent, in the presence of 0.1-5% of a free radical initiator, based on total weight of monomers, and removing the solvent, to provide the resin in powder form.  
   
   
       12 . A process according to  claim 11  wherein said mixture of monomers comprises 20-80% of said vinyl amide, 20-80% of said polymerizable carboxylic acid, 0.4-2% of said crosslinker and 0.5-2% of said initiator.  
   
   
       13 . A process according to  claim 11  wherein said reaction mixture comprises 10-25% of said monomers and 75-90% of said solvent.  
   
   
       14 . A hair care composition including the rheology modifier/hair styling resin of  claim 1 .  
   
   
       15 . A hair care composition according to  claim 14  including 0.1-20% by wt. of said resin.  
   
   
       16 . A hair care composition according to  claim 14  which has a viscosity of about 30,000 to 100,000 cps at a pH of about 5 to 9.  
   
   
       17 . A hair care composition according to  claim 16  wherein said viscosity is 40,000 to 70,000 cps.  
   
   
       18 . A hair care composition according to  claim 14  which exhibits a curl retention of 80% to 100% over a 4-hour period at 90% RH and 80° F.  
   
   
       19 . A hair care composition according to  claim 18  wherein said retention is about 90%.  
   
   
       20 . A personal care composition including the resin of  claim 1 .  
   
   
       21 . A personal care composition according to  claim 20  which is a skin care formulation.  
   
   
       22 . A personal care composition according to  claim 21  which is an absorbent composition.  
   
   
       23 . A personal care composition according to  claim 20  which includes a thickener.  
   
   
       24 . A personal care composition according to  claim 23  wherein said thickener is a crosslinked polyacrylic acid or its copolymer.  
   
   
       25 . A personal care composition according to  claim 23  wherein said thickener is crosslinked polymethylvinyl ether/maleic anhydride) copolymer.  
   
   
       26 . An aqueous hair care composition according to  claim 14  having a yield stress value of 10 to 100,000 dynes/cm 2 .  
   
   
       27 . A composition according to  claim 26  wherein said value is 100 to 10,000 dynes/cm 2 .  
   
   
       28 . A hair care composition including the rheology modifier of  claim 1  which is a hair fixative, a styling gel, a creme, a mousse, or a spray.  
   
   
       29 . A hair care composition according to  claim 15  which includes 0.2-10% by wt. of said resin.  
   
   
       30 . A hair care composition according to  claim 29  which includes 0.5-5% by wt. of said resin.