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  Rheology modifier/hair styling resinUSPTO Application #: 20070202064Title: 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. (end of abstract)
Agent: International Specialty Products William J. Davis, Esq. - Wayne, NJ, US Inventors: Michael Drzewinski, Joseph Albanese, Eduardo T. Yap, Jenn S. Shih USPTO Applicaton #: 20070202064 - Class: 424070100 (USPTO) Related Patent Categories: Drug, Bio-affecting And Body Treating Compositions, Live Hair Or Scalp Treating Compositions (nontherapeutic) The Patent Description & Claims data below is from USPTO Patent Application 20070202064. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] The present application is a Continuation application which claims the benefit of U.S. Nonprovisional application Ser. No. 10/964,948, filed on Oct. 14, 2004; which is incorporated herein by reference thereto. FIELD OF THE INVENTION [0002] This invention relates to hair care compositions, and, more particularly, to a rheology modifier/hair styling resin which is a crosslinked, linear poly(vinyl amide/polymerizable carboxylic acid) copolymer for use in such compositions. BACKGROUND OF THE INVENTION [0003] J. Shih, in U.S. Pat. No. 5,015,708, described a process for making terpolymers of vinyl pyrrolidone, acrylic acid and lauryl methacrylate monomers by precipitation polymerization in an aliphatic hydrocarbon solvent. [0004] Frenz, V. in WO 02/32975, Apr. 25, 2002, described absorbent materials made by grafting acrylic acid monomer onto polyvinyl pyrrolidone polymer in water in the presence of a crosslinking agent. The resultant crosslinked graft copolymer matrix contained 79.9-99.9% of acrylic acid. [0005] Accordingly, it is an object of this invention to provide a rheology modifier/hair styling resin which is a crosslinked, linear poly(vinyl amide/polymerizable carboxylic acid) copolymer; and a process for making same. [0006] Another object herein is to provide a crosslinked, linear copolymer which is particularly advantageous for use in hair care compositions. Still another object is to provide hair care formulations which exhibits both high viscosity and long-lasting curl retention for the user. SUMMARY OF THE INVENTION [0007] What is described herein is a rheology modifier/hair styling resin which is a crosslinked, linear poly(vinyl amide/polymerizable carboxylic acid) copolymer. [0008] Suitable vinyl amides include vinyl pyrrolidone, vinyl caprolactam, N-vinyl formamide, N-vinylacetamide, N-vinyl-N-methylacetamide and mixtures thereof, preferably vinyl pyrrolidone. [0009] Suitable polymerizable carboxylic acids include (meth)acrylic acid, crotonic acid, itaconic acid, maleic acid and mixtures thereof, preferably acrylic acid. [0010] Suitable crosslinkers have at least two free radical polymerizable groups in the molecule, e.g. pentaerythritol triallylether, pentaerythritol triacrylate, pentaerythritol tetraacrylate or methylene bisacrylamide. [0011] The composition of the rheology modifier/hair styling resin of the present invention includes a vinyl amide, in an amount of by weight, 1-99% of the composition, a polymerizable carboxylic acid in an amount of 1-99% of the composition, and a crosslinker in an amount of 0.2-3%, based on total weight of monomers. [0012] Preferably, the vinyl amide monomer is present in an amount of 25-80%, the polymerizable carboxylic acid in an amount of 20-80%, and the crosslinker 0.4-2%, based on total weight of monomers. [0013] Optionally, the rheology modifier/hair styling resin may include one or more additional monomers, e.g. lauryl (meth)acrylate, stearyl (meth)acrylate, alkyl (meth)acrylamide or alkyl (meth)acrylate. The alkyl can be C.sub.1 to C.sub.30 or polyethylene oxide. [0014] As another feature of the invention, there is described a process of making the rheology modifier/hair styling resin which comprises precipitation polymerizing, by wt., 5-50%, preferably 10-25%, of a mixture of a vinyl amide, a polymerizable carboxylic acid and a crosslinker, in the presence of 50-95%, preferably 75-90%, of a non-polar, removable organic solvent, and 0.1-5%, preferably 0.5-2%, of a free radical initiator, based on total weight of monomers. [0015] Yet another feature of the invention is the provision of a personal care composition, e.g. a hair care composition, which includes the rheology modifier/hair styling resin of the invention, suitably in an amount of 0.1-20% by wt. of the composition, preferably 0.2-10%, and most preferably 0.5-5%. [0016] Typical hair care compositions which include the invention resin have an advantageously high viscosity of about 30,000 to 100,000 cps, preferably 40,000 to 70,000 cps, at a pH of about 5 to 9 and a long-lasting curl retention of 95 to 100% over a 4-hour period at 90% RH and 80.degree. F. [0017] The hair care compositions of the invention also exhibit other advantageous user properties, such as shine, stiffness, crunch, stiffness after 5.sup.th and 10.sup.th compression, curl snap, comb drag, residue on comb, manageability, hair feel and static. BRIEF DESCRIPTION OF THE FIGURES [0018] FIG. 1 is a plot of Viscosity vs. pH for the rheology modifier/hair styling resin of the present invention. [0019] FIG. 2 is a plot of Curl Retention vs. Time for a hair care formulation which includes the resin of the invention. Continue reading... Full patent description for Rheology modifier/hair styling resin Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Rheology modifier/hair styling resin patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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