Polymeric thickener for iridescent liquid hand soap compositions

Patent metadata

Field	Value
Publication number	US-11339236-B2
Application number	US-201816651429-A
Country	US
Kind code	B2
Filing date	Sep 19, 2018
Priority date	Sep 28, 2017
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

Disclosed are multi-staged acrylic emulsion polymers and their use as rheology modifiers in the formulation of liquid personal care cleansers for the skin and hair. More particularly, the present technology relates to liquid cleansing compositions that possess the necessary rheology properties to stably suspend particles and insoluble materials within the cleanser but may also be used with pump dispensers to generate and dispense a creamy foam without fouling the pump mechanism.

First claim

What is claimed is:

1. Structured emulsion polymer particles comprising:
(a) from about 15 to about 25 percent by weight of a first stage polymer core which is polymerized from a monomer mixture comprising (i) from about 53 to about 60 weight percent of at least one ethylenically unsaturated C 3 -C 6 carboxylic acid monomer, (ii) from about 39 to about 46 weight percent of at least one C 1 -C 4 alkyl (meth)acrylate monomer, and (iii) at least one crosslinking monomer;
(b) from about 85 to about 75 percent by weight of a second stage polymer shell which is polymerized from a monomer mixture comprising (i) from about 47 to about 55 weight percent of least one ethylenically unsaturated C 3 -C 6 carboxylic acid monomer, (ii) from about 52 to 44 wt. % of at least one C 1 -C 4 alkyl (meth)acrylate monomer and (iii) at least one crosslinking monomer;
wherein the weight fraction of the at least one ethylenically unsaturated C 3 -C 6 carboxylic acid monomer present in said first stage monomer mixture is 3 to 20 percent greater than the weight fraction of at least one C 3 -C 6 carboxylic acid monomer present in said second stage monomer mixture;
wherein the sum total of said crosslinking monomer present in said first and said second stage monomer mixtures ranges from about 0.5 weight percent to about 1.5 weight percent, based on the weight of the total monomer present in said first and second stage monomer mixtures and the weight fraction of said crosslinking monomer present in said first stage monomer mixture to said second stage monomer mixture ranges from 15:50 to 85:50 percent; and
wherein said at least one ethylenically unsaturated C 3 -C 6 carboxylic acid monomer in each of the first stage monomer mixture and the second stage monomer mixture comprises (meth)acrylic acid and said at least one crosslinking monomer in each of the first stage monomer mixture and the second stage monomer mixture comprises a polyfunctional acrylate.

2. The structured emulsion polymer particles of claim 1 wherein said at least one ethylenically unsaturated C 3 -C 6 carboxylic acid monomer in said first stage monomer mixture and in said second stage monomer mixture is independently selected from acrylic acid and methacrylic acid, optionally in combination with itaconic acid, citraconic acid, maleic acid, maleic anhydride, fumaric acid, crotonic acid, aconitic acid, and mixtures thereof.

3. The structured emulsion polymer particles of claim 1 wherein said at least one C 1 -C 4 alkyl (meth)acrylate monomer in said first stage monomer mixture and said second stage monomer mixture is independently selected from methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, t-butyl (meth)acrylate, and mixtures thereof.

4. The structured emulsion polymer particles of claim 1 wherein said at least one ethylenically unsaturated C 3 -C 6 carboxylic acid monomer in said first stage monomer mixture is methacrylic acid.

5. The structured emulsion polymer particles of claim 1 wherein said at least one ethylenically unsaturated C 3 -C 6 carboxylic acid monomer in said second stage monomer mixture is methacrylic acid.

6. The structured emulsion polymer particles of claim 1 wherein said at least one C 1 -C 4 alkyl (meth)acrylate monomer in said first stage monomer mixture is selected from ethyl acrylate, butyl acrylate, and mixtures thereof.

7. The structured emulsion polymer particles of claim 1 wherein said at least one C 1 -C 4 alkyl (meth)acrylate monomer in said second stage monomer mixture is selected from ethyl acrylate, butyl acrylate, and mixtures thereof.

8. The structured emulsion polymer particles of claim 1 wherein said crosslinking monomer in said first stage monomer mixture and said second stage monomer mixture is independently selected from a polyfunctional acrylate optionally in combination with a polyallyl ether.

9. The structured emulsion polymer particles of claim 8 wherein said crosslinking monomer is selected from ethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, 1,3-butylene glycol di(meth)acrylate, 1,4-butylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, trimethylolethane tri(meth)acrylate, tetramethylolmethane tri(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, tetramethylolmethane tetra(meth)acrylate, pentaerythritol tetra(meth)acrylate; dipentaerythritol hexa(meth)acrylate, 1,4-cyclohexanediol dimethacrylate, and mixtures thereof.

10. The structured emulsion polymer particles of claim 8 wherein said crosslinking monomer is selected from allyl (meth)acrylate.

11. The structured emulsion polymer particles of claim 9 wherein said crosslinking monomer in said first stage monomer mixture and said second stage monomer mixture is selected from trimethylolpropane triacrylate.

12. The structured emulsion polymer particles of claim 1 having a minimum film formation temperature ranging from about 18 to about 40° C.

13. A thickener comprising the structured emulsion polymer particles of claim 1 .

14. A cleansing composition comprising:
(a) from about 0.5 to about 40 wt. % of at least one foaming surfactant;
(b) from about 0.05 wt. % to about 10 wt. % of the polymer (active polymer solids) of claim 1 ; and
(c) water, wherein weight percentages are based on the total weight of the composition.

15. The cleansing composition of claim 14 further comprising an alkaline neutralizing agent.

16. The cleansing composition of claim 14 further comprising suspended particles.

17. The cleansing composition claim 14 having a Brookfield viscosity ranging from about 300 to about 1000 mPa·s at 25° C.

18. The cleansing composition of claim 14 having a yield value of ≥12 dyn/cm 2 .

19. The cleansing composition of claim 14 , wherein said at least one foaming surfactant is selected from an anionic surfactant, an amphoteric surfactant, zwitterionic surfactant, cationic surfactant, nonionic surfactant, and mixtures thereof.

20. The cleansing composition of claim 14 wherein said at least one surfactant is a mixture of an anionic surfactant and an amphoteric surfactant.

21. The cleansing composition of claim 20 wherein the weight ratio of anionic surfactant to amphoteric surfactant (active material) is 10:1 to about 2:1.

22. The cleansing composition of claim 16 wherein said particles are selected from coated mica, mica coated metal oxides, pigments, exfoliants, anti-dandruff agents, clay, swellable clay, laponite, gas bubbles, liposomes, microsponges, cosmetic beads, flakes and glitter.

23. A process for preparing a structured emulsion polymer formed by sequentially polymerizing from about 15 to about 25 wt. % of a first monomer mixture to form a core and from about 85 to about 75 wt. % of a second monomer mixture to form a shell, wherein said first monomer mixture comprises (i) from about 53 to about 60 weight percent of at least one ethylenically unsaturated C 3 -C 6 carboxylic acid monomer, (ii) from about 39 to about 46 weight percent of at least one C 1 -C 4 alkyl (meth)acrylate monomer, and (iii) at least one crosslinking monomer; and said second monomer mixture comprises (iv) from about 47 to about 55 weight percent of least one ethylenically unsaturated C 3 -C 6 carboxylic acid monomer (v) from about 52 to 44 wt. % of at least one C 1 -C 4 alkyl (meth)acrylate monomer, and (vi) at least one crosslinking monomer;
wherein t

Assignees

• Lubrizol Advanced Mat Inc

Inventors

• Prata Joseph E
• Myers Michael P
• Tamareselvy Krishnan

Classifications

• C11D3/3765

  in liquid compositions · CPC title

• C08F265/06 Primary

  Polymerisation of acrylate or methacrylate esters on to polymers thereof · CPC title

• A61Q19/10

  Washing or bathing preparations · CPC title

• A61K8/8152

  Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers · CPC title

• C11D3/0094

  High foaming compositions · CPC title