Thickeners for products for topical application
AssigneeScott Bader Company Limited
InventorsArshad-Ul-Hag Chaudhry, Roman J. Mikolajewicz
Life of this patent
Estimating the term…
Abstract
A thickener for products for topical application such as personal care products for application to the skin or hair, or topically administrable pharmaceutical preparations, comprises a water-in-oil emulsion containing polymeric material, at least 98% of which polymeric material is soluble in the aqueous phase. The polymeric material comprises units derived from (a) acrylamide, (b) 2-acrylamido-2-methylpropane-sulphonic acid (AMPS) and (c) a polyfunctional monomer, present in an amount of from 0.12 to 2 milliequivalents per mol of total monomer units. At least some of the AMPS units are in the form of a neutral salt such that the aqueous phase of the water in oil emulsion has a pH of at least 5.5.
Claims13
A personal care or pharmaceutical composition for topical application comprising
- a topically acceptable liquid phase comprising a water phase,
- a polymeric material at least 98% of which is water soluble, which polymeric material consists of monomer components (a) acrylamide, (b) 2-acrylamido-2-methylpropanesulphonic acid and (c) a polyfunctional monomer which is allyl sucrose, allyl pentaerythritol or methylene-bisacrylamide for cross linking with said monomer components (a) and (b), which said monomer components (a) and (b) are present in the polymer material in a molar ratio (a)/(b) of from 85/15 to 15/85 inclusive and which polyfunctional monomer is present in an amount of from 0.12 to 2 milliequivalents inclusive per mole of total monomer units, an oil phase, a water in oil emulsifier, an oil in water emulsifier, and a topically acceptable adjuvant, and whereby said polymeric material serves to thicken the composition and render essentially constant the viscosity of the composition over a pH range of from 5.5 to 9.
A water in oil emulsion containing a polymeric material, at least 98% of the polymeric material in the emulsion being water soluble, which polymeric material consists of monomer components (a) acrylamide, (b) 2-acrylamido-2-methyl-propanesulphonic acid and (c) a polyfunctional monomer which is allyl sucrose, allyl pentaerythritol or methylene-bisacrylamide for cross linking with said monomer components (a) and (b), which said monomer components (a) and (b) are present in the polymeric material in a molar ratio (a)/(b) of from 85/15 to 15/85 inclusive and which polyfunctional monomer is present in an amount of from 0.12 to 2 milliequivalents inclusive per mole of total monomer units, at least some of the 2-acrylamido-2-methylpropanesulphonic acid units being in the form of a neutral salt thereof such that the water phase of the water in oil emulsion has a pH of at least 5.5, which water in oil emulsion is capable, on admixture with a topically acceptable liquid-containing formulation of increasing the viscosity of said formulation to provide a thickened composition having an essentially constant viscosity over a pH range of the composition of from 5.5 to 9.
In a personal care or pharmaceutical composition for topical application comprising an active ingredient, a water phase and an oil phase, a water-in-oil emulsifier and an oil-in-water emulsifier and a thickener, the improvement wherein said thickener is a polymeric material which is at least 98% water soluble and consists of monomeric units of monomer components (a) acrylamide, (b) 2-acrylamido-2-methylpropanesulphonic acid and (c) a polyfunctional monomer which is allyl sucrose, allyl pentaerythritol or methylene-bisacrylamide for cross linking with said monomer components (a) and (b), monomer components (a) and (b) being present in the polymer material in a molar ratio (a)/(b) of from 85/15 to 15/85 inclusive and the polyfunctional monomer (c) being present in an amount of from 0.12 to 2 milliequivalents inclusive per mole of total monomer units, said polymeric material functioning to thicken the composition and render the viscosity thereof essentially constant over a pH range of from 5.5 to 9.
Dependencies are inferred from the claim text.