Process for increasing the viscosity of aqueous solutions of homogeneous copolymers of vinyl pyrrolidone and n-3, 3-dimethylaminopropyl methacrylamide
AssigneeISP Investments Inc.
InventorsLowell Ray Anderson, Kou-Chang Liu, Hemant Parikh
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Abstract
A process is described for increasing the viscosity and high humidity curl retention of aqueous solutions of homogeneous copolymers of 20-99% vinyl pyrrolidone (VP) and 1-80% N-3,3-dimethylamino-propyl methacrylamide (DMAPMA). The high viscosity solutions are particularly useful as the active component of hair care products.
Claims5
A process for increasing the viscosity of aqueous solutions of substantially homogeneous copolymers of VP and DMAPMA having a copolymer compositional range of 20-99% by weight VP and 1-80% by weight DMAPMA from about 18,000 cps to up to about 200,000 cps at 10% solids, which comprises heating the aqueous solution of the copolymer with a sufficient amount of t-butylperoxy pivalate to increase its viscosity to the desired level.
Dependencies are inferred from the claim text.