Homogeneous polymerization process for making substantially homogeneous terpolymers of vinyl pyrrolidone, an organic quarternary ammonium monomer and a hydrophobic monomer
AssigneeISP Investments Inc.
InventorsKou-Chang Liu, Robert B. Login, Yakir Reuven
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Abstract
A homogeneous polymerization process is described for making substantially homogeneous terpolymers of, by weight, 55-99%, preferably 65-95% of vinyl pyrrolidone; 0.5-49%, preferably 1-25% of a quaternary amino monomer, preferably 3-methacrylamidopropyl trimethylammonium chloride; and 0.5-49%, preferably 1-25%, of a hydrophobic monomer, preferably octadecyl methacrylate. The homogeneous terpolymer provides dual hair styling and conditioning functions in hair care applications.
Claims13
A homogeneous polymerization process for making clear solutions of a substantially homogeneous terpolymer comprising by weight, (a) 55-99% of a vinyl lactam, (b) 0.5-49% of an organic quaternary ammonium monomer, and (c) 0.5-49% of a hydrophobic monomer, by polymerization of the monomers in a solvent in the presence of a radical initiator, which comprises:
- (a) precharging a reactor with a predetermined amount of the vinyl lactam, and solvent, at a suitable polymerization temperature, and
- (b) introducing the quaternary amino monomer and the hydrophobic monomer incrementally into said reactor in predetermined rates corresponding to the rate of disappearance of the vinyl lactam, over a given period of time.
Dependencies are inferred from the claim text.