Search

EP-4739270-A1 - PERSONAL CARE RINSE OFF FORMULATION

EP4739270A1EP 4739270 A1EP4739270 A1EP 4739270A1EP-4739270-A1

Abstract

An aqueous personal care rinse off formulation is provided comprising: a dermatologically acceptable vehicle; a dermatologically acceptable cleaning surfactant; and a gradient polymer comprising: 5-35 wt% structural units (meth)acrylic acid; 35-65 wt% structural units C 1-8 alkyl (meth)acrylate; ＞ 10-30 wt% structural units a specialized associative monomer having structure (I) wherein R 1 is linear saturated C 12-26 alkyl group; wherein R 2 is hydrogen or methyl group and wherein n is 10-30; 0.01-2 wt% structural units multiethylenically unsaturated monomer; wherein the gradient polymer comprises ＜ 0.05 wt% structural units sulfonated monomer; wherein the polymer comprises ＜ 0.02 wt% structural units monomer having structure (II) wherein R 3 is -H or -CH 3 ; R 4 is -H or C 1-4 alkyl group; R 5 is -C 1-4 alkyl group; α is 0-50; b is 0-20; c is 0-50; α + c is 1-100 and d is 1-4; and wherein the gradient polymer has a gradient polymeric morphology.

Inventors

  • ZENG, FANWEN
  • ZHANG, SHILING
  • SHULMAN, INNA
  • LU, XIADONG
  • O'CONNOR, YING

Assignees

  • Dow Global Technologies LLC
  • Rohm and Haas Company

Dates

Publication Date
20260513
Application Date
20230706

Claims (10)

  1. An aqueous personal care rinse off formulation, comprising: a dermatologically acceptable vehicle; a dermatologically acceptable cleaning surfactant; and a gradient polymer comprising: (a) 5 to 35 wt%, based on dry weight of the gradient polymer, of structural units of (meth) acrylic acid; (b) 35 to 65 wt%, based on dry weight of the gradient polymer, of structural units of C 1-8 alkyl (meth) acrylate; (c) > 10 to 30 wt%, of structural units of a specialized associative monomer having structure I wherein each R 1 is independently selected from a linear saturated C 12-26 alkyl group; wherein each R 2 is independently selected from a hydrogen and a methyl group and wherein n is 10 to 30; and (d) 0.01 to 2 wt%, based on dry weight of the gradient polymer, of structural units of multiethylenically unsaturated monomer; wherein the gradient polymer comprises ＜ 0.05 wt%, based on dry weight of the gradient polymer, of structural units of sulfonated monomer; wherein the polymer comprises ＜ 0.02 wt%, based on dry weight of the gradient polymer, of structural units of monomer having structure II wherein each R 3 is independently selected from -H and -CH 3 ; wherein each R 4 is independently selected from -H and a -C 1-4 alkyl group; wherein each R 5 is independently selected from a -C 1-4 alkyl group; wherein a is 0 to 50; wherein b is 0 to 20; wherein c is 0 to 50; wherein a + c is 1 to 100; and wherein d is 1 to 4; and wherein the gradient polymer has a gradient polymeric morphology.
  2. The aqueous personal care rinse off formulation of claim 1, wherein the structural monomer units of specialized associative monomer having structure I is a blend of a first specialized associative monomer having structure Ia wherein each R 1a is independently selected from a linear saturated C 12-19 alkyl group; wherein each R 2a is independently selected from a hydrogen and a methyl group and wherein na is 10 to 30; and a second specialized associative monomer having structure Ib wherein each R 1b is independently selected from a linear saturated C 20-26 alkyl group; wherein each R 2b is independently selected from a linear saturated hydrogen and a methyl group; and wherein nb is 10 to 30.
  3. The aqueous personal care rinse off formulation of claim 1, wherein the structural units of (meth) acrylic acid include structural units of both methacrylic acid and acrylic acid.
  4. The aqueous personal care rinse off formulation of claim 1, wherein the single stage gradient polymer comprises ＜ 0.01 wt%, based on dry weight of the gradient polymer, of structural units of monomer selected from the group consisting of styrene, butyl acrylate, ethylhexyl acrylate, lauryl acrylate, stearyl acrylate, methyl methacrylate, butyl acrylate and mixtures thereof.
  5. The aqueous personal care rinse off formulation of claim 1, wherein the polymer comprises ＜ 2 wt%, based on dry weight of the gradient polymer, of monomer selected from the group consisting of alkyl (meth) acrylate having 6 to 18 carbon, vinyl alkanoate having 6 to 18 carbon atoms, N-vinyl alkylamide having 6 to 18 carbon atoms, N-alkyl (meth) acrylamide having 6 to 18 carbon atoms and mixtures thereof.
  6. The aqueous personal care rinse off formulation of claim 1, wherein the dermatologically acceptable vehicle comprises water.
  7. The aqueous personal care rinse off formulation of claim 1, wherein the dermatologically acceptable cleaning surfactant comprises an amino acid surfactant.
  8. The aqueous personal care rinse off formulation of claim 1, wherein the amino acid surfactant is selected from the group consisting of sodium cocoyl glutamate, sodium cocoyl alaninate, sodium cocoyl glycinate, sodium lauroyl sarcosinate and mixtures thereof.
  9. The aqueous personal care rinse off formulation of claim 1, wherein the aqueous personal care rinse off formulation further comprises a thickening salt.
  10. A method of cleaning at least one of mammalian skin and hair, comprising: (a) applying an aqueous personal care rinse off formulation of claim 1 to the skin or hair; and (b) rinsing the aqueous personal care rinse off formulation from the skin or hair with a rinse water.

Description

PERSONAL CARE RINSE OFF FORMULATION The present invention relates to an aqueous personal care rinse off formulation. In particular, the present invention relates to an aqueous personal care rinse off formulation, comprising: a dermatologically acceptable vehicle; a dermatologically acceptable cleaning surfactant; and a gradient polymer comprising: (a) 5 to 35 wt%, based on dry weight of the gradient polymer, of structural units of (meth) acrylic acid; (b) 35 to 65 wt%, based on dry weight of the gradient polymer, of structural units of C1-8 alkyl (meth) acrylate; (c) ＞ 10 to 30 wt%, of structural units of a specialized associative monomer having structure I wherein each R1 is independently selected from a linear saturated C12-26 alkyl group; wherein each R2 is independently selected from a hydrogen and a methyl group and wherein n is 10 to 30; and (d) 0.01 to 2 wt%, based on dry weight of the gradient polymer, of structural units of multiethylenically unsaturated monomer; wherein the gradient polymer comprises ＜ 0.05 wt%, based on dry weight of the gradient polymer, of structural units of sulfonated monomer; wherein the polymer comprises ＜ 0.02 wt%, based on dry weight of the gradient polymer, of structural units of monomer having structure II wherein each R3 is independently selected from -H and -CH3; wherein each R4 is independently selected from -H and a -C1-4 alkyl group; wherein each R5 is independently selected from a -C1-4 alkyl group; wherein a is 0 to 50; wherein b is 0 to 20; wherein c is 0 to 50; wherein a + c is 1 to 100; and wherein d is 1 to 4; and wherein the gradient polymer has a gradient polymeric morphology. Amino acid based surfactants have an array of desirable properties for use in personal care rinse off formulations (e.g., shampoo, body wash) . Such surfactants are often naturally derived and readily biodegradable. They are very mild and cause less irritation to skin and  hair compared to more traditional sulfate and sulfonate based surfactants like sodium lauryl sulfate and sodium lauryl ether sulfate. They tend to demonstrate lower toxicity and reduced negative impact on the environment than more traditional sulfate and sulfonate based surfactants. The have good cleaning and foaming properties. Notwithstanding, formulations comprising amino acid based surfactants are challenging to efficiently thicken. Some conventional thickeners achieve target viscosity at high usage levels which may negatively impact foaming performance. In other cases, conventional thickeners can provide adequate thickening, but the formulation viscosity is sensitive to changes in temperature; becoming watery at a high temperature and jelly like at low temperatures. Some conventional thickeners such as xanthan gum or cellulose esters exhibit potential compatibility issues resulting in phase separation. Accordingly, there remains a continuing need for viscosity modifiers that facilitate formulation of aqueous personal care rinse off formulations, in particular amino acid surfactant containing aqueous personal care rinse of formulations (e.g., shampoo, body wash) , with increased viscosity at low shear rates while maintaining desired flow properties at higher shear rates. The present invention provides an aqueous personal care rinse off formulation comprising: a dermatologically acceptable vehicle; a dermatologically acceptable cleaning surfactant; and a gradient polymer comprising: (a) 5 to 35 wt%, based on dry weight of the gradient polymer, of structural units of (meth) acrylic acid; (b) 35 to 65 wt%, based on dry weight of the gradient polymer, of structural units of C1-8 alkyl (meth) acrylate; (c) ＞ 10 to 30 wt%, of structural units of a specialized associative monomer having structure I wherein each R1 is independently selected from a linear saturated C12-26 alkyl group; wherein each R2 is independently selected from a hydrogen and a methyl group and wherein n is 10 to 30; and (d) 0.01 to 2 wt%, based on dry weight of the gradient polymer, of structural units of multiethylenically unsaturated monomer; wherein the gradient polymer comprises ＜ 0.05 wt%, based on dry weight of the gradient polymer, of structural units of sulfonated monomer; wherein the polymer comprises ＜ 0.02 wt%, based on dry weight of the gradient polymer, of structural units of monomer having structure II wherein each R3 is independently selected from -H and -CH3; wherein each R4 is independently selected from -H and a -C1-4 alkyl group; wherein each R5 is independently selected from a -C1-4 alkyl group; wherein a is 0 to 50; wherein b is 0 to 20; wherein c is 0 to 50; wherein a + c is 1 to 100; and wherein d is 1 to 4; and wherein the gradient polymer has a gradient polymeric morphology. The present invention provides an aqueous personal care rinse off formulation comprising: a dermatologically acceptable vehicle; a dermatologically acceptable cleaning surfactant; and a gradient polymer comprising: (a) 5 to 35 wt%, based on dry w