Process for the preparation of inverse latex of acrylamide-based polymers and composition comprising said latex

Abstract

Process for the preparation of a composition including an oil phase, an aqueous phase, at least one emulsifying system of water-in-oil (W/O) type, optionally at least one emulsifying system of oil-in-water (O/W) type, in the form of an inverse latex including from 20% to 70% by weight and preferably from 25% to 50% by weight of a branched or crosslinked polyelectrolyte, characterized in that the polyelectrolyte is a copolymer of 2-acrylamido-2-methylpropanesulfonic acid partially or totally salified with acrylamide and optionally one or more monomers chosen from monomers containing a partially or totally salified weak acid function and/or from neutral monomers other than acrylamide, the production process being characterized in that the preparation of the aqueous phase includes the dissolution in the aqueous medium of solid 2-acrylamido-2-methyl propanesulfonic acid before neutralization. Cosmetic, dermopharmaceutical or pharmaceutical composition including the inverse latex directly obtained by the process.

1 . A cosmetic, dermopharmaceutical or pharmaceutical composition, comprising:
 as a thickening and/or emulsifying compound, at least one inverse latex comprising an oil phase, an aqueous phase, at least one emulsifying system of water-in-oil (W/O) type and from 20% to 70% by weight of a branched or crosslinked polyelectrolyte,   wherein the said polyelectrolyte is a copolymer of 2-acrylamido-2-methylpropanesulfonic acid partially or totally salified with acrylamide.   
     
     
         2 . The cosmetic, dermopharmaceutical or pharmaceutical composition as defined in  claim 1 , further comprising a combination selected from the group consisting of:
 dihydroxyacetone and lactic acid or gluconic acid,   dihydroxyacetone and at least one sunscreen agent,   dihydroxyacetone and at least a moisturizing agent, and   dihydroxyacetone and caffeine.   
     
     
         3 . The cosmetic, dermopharmaceutical or pharmaceutical composition as defined in  claim 1 , wherein the polyelectrolyte comprises between 60 mol % and 20 mol % of partially or totally salified 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid monomer and between 40 mol % and 80 mol % of acrylamide monomer 
     
     
         4 . The cosmetic, dermopharmaceutical or pharmaceutical composition as defined in  claim 3 , wherein the polyelectrolyte comprises between 50 mol % and 30 mol % of partially or totally salified 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propane sulfonic acid monomer and between 50 mol % and 70 mol % of acrylamide monomer. 
     
     
         5 . The cosmetic, dermopharmaceutical or pharmaceutical composition as defined in  claim 1 , wherein the polyelectrolyte is a copolymer of partially or totally salified 2-acrylamido-2-methylpropanesulfonic acid, of acrylamide and of one or more monomers chosen from monomers containing a weak acid function and/or neutral monomers other than acrylamide, the mole proportion of all of the monomers chosen from the monomers containing a weak acid function and the neutral monomers other than acrylamide is greater than 0% and less than or equal to 30%. 
     
     
         6 . The cosmetic, dermopharmaceutical or pharmaceutical composition as defined in  claim 5 , wherein in the polyelectrolyte, the mole ratio between the acrylamide and all of the monomers chosen from the monomers containing a weak acid function and the neutral monomers other than acrylamide is greater than or equal to 1. 
     
     
         7 . The cosmetic, dermopharmaceutical or pharmaceutical composition as defined in  claim 1 , wherein the polyelectrolyte is selected from the group consisting of:
 crosslinked copolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt and of acrylamide;   crosslinked copolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the ammonium salt and of acrylamide;   crosslinked copolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the potassium salt and of acrylamide;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, of the potassium salt or of the ammonium salt, of acrylic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt and of acrylamide;   crosslinked tetrapolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of N,N-dimethylacrylamide and of acrylamide;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of N,N-dimethylacrylamide and of acrylamide;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylamide and of N-isopropylacrylamide;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylamide and of N-[2-hydroxy-1,1-bis(hydroxymethyl)ethyl]propenamide;   crosslinked tetrapolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylamide and of (2-hydroxyethyl)acrylate;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylamide and of (2-hydroxyethyl)acrylate.   
     
     
         8 . A cosmetic, dermocosmetical or pharmaceutical sunscreen composition, comprising:
 at least one sunscreen; and   at least one inverse latex comprising an oil phase, an aqueous phase, at least one emulsifying system of water-in-oil (W/O) type and from 20% to 70% by weight of a branched or crosslinked polyelectrolyte, wherein the said polyelectrolyte is a copolymer of 2-acrylamido-2-methylpropanesulfonic acid partially or totally salified with acrylamide.   
     
     
         9 . The cosmetic, dermopharmaceutical or pharmaceutical sunscreen composition as defined in  claim 8 , wherein the polyelectrolyte comprises between 60 mol % and 20 mol % of partially or totally salified 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid monomer and between 40 mol % and 80 mol % of acrylamide monomer 
     
     
         10 . The cosmetic, dermopharmaceutical or pharmaceutical sunscreen composition as defined in  claim 9 , wherein the polyelectrolyte comprises between 50 mol % and 30 mol % of partially or totally salified 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid monomer and between 50 mol % and 70 mol % of acrylamide monomer. 
     
     
         11 . The cosmetic, dermopharmaceutical or pharmaceutical sunscreen composition as defined in  claim 8 , wherein the polyelectrolyte is a copolymer of partially or totally salified 2-acrylamido-2-methylpropanesulfonic acid, of acrylamide and of one or more monomers chosen from monomers containing a weak acid function and/or neutral monomers other than acrylamide, the mole proportion of all of the monomers chosen from the monomers containing a weak acid function and the neutral monomers other than acrylamide is greater than 0% and less than or equal to 30%. 
     
     
         12 . The cosmetic, dermopharmaceutical or pharmaceutical sunscreen composition as defined in  claim 11 , wherein in the polyelectrolyte, the mole ratio between the acrylamide and all of the monomers chosen from the monomers containing a weak acid function and the neutral monomers other than acrylamide is greater than or equal to 1. 
     
     
         13 . The cosmetic, dermopharmaceutical or pharmaceutical sunscreen composition as defined in  claim 8 , wherein the polyelectrolyte is selected from the group consisting of:
 crosslinked copolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt and of acrylamide;   crosslinked copolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the ammonium salt and of acrylamide;   crosslinked copolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the potassium salt and of acrylamide;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, of the potassium salt or of the ammonium salt, of acrylic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt and of acrylamide;   crosslinked tetrapolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of N,N-dimethylacrylamide and of acrylamide;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of N,N-dimethylacrylamide and of acrylamide;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylamide and of N-isopropylacrylamide;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylamide and of N-[2-hydroxy-1,1-bis(hydroxymethyl)ethyl]propenamide;   crosslinked tetrapolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylamide and of (2-hydroxyethyl)acrylate;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylamide and of (2-hydroxyethyl)acrylate.   
     
     
         14 . A self-tanning composition, comprising:
 an efficient quantity of dihydroxyacetone; and   at least one inverse latex comprising an oil phase, an aqueous phase, at least one emulsifying system of water-in-oil (W/O) type and from 20% to 70% by weight of a branched or crosslinked polyelectrolyte, wherein the said polyelectrolyte is a copolymer of 2-acrylamido-2-methylpropanesulfonic acid partially or totally salified with acrylamide.   
     
     
         15 . The self-tanning composition as defined in  claim 14 , wherein the polyelectrolyte comprises between 60 mol % and 20 mol % of partially or totally salified 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid monomer and between 40 mol % and 80 mol % of acrylamide monomer 
     
     
         16 . The self-tanning composition as defined in  claim 15 , wherein the polyelectrolyte comprises between 50 mol % and 30 mol % of partially or totally salified 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid monomer and between 50 mol % and 70 mol % of acrylamide monomer. 
     
     
         17 . The self-tanning composition as defined in  claim 14 , wherein the polyelectrolyte is a copolymer of partially or totally salified 2-acrylamido-2-methylpropanesulfonic acid, of acrylamide and of one or more monomers chosen from monomers containing a weak acid function and/or neutral monomers other than acrylamide, the mole proportion of all of the monomers chosen from the monomers containing a weak acid function and the neutral monomers other than acrylamide is greater than 0% and less than or equal to 30%. 
     
     
         18 . The self-tanning composition as defined in  claim 17 , wherein in the polyelectrolyte, the mole ratio between the acrylamide and all of the monomers chosen from the monomers containing a weak acid function and the neutral monomers other than acrylamide is greater than or equal to 1. 
     
     
         19 . The self-tanning composition as defined in  claim 14 , wherein the polyelectrolyte is selected from the group consisting of:
 crosslinked copolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt and of acrylamide;   crosslinked copolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the ammonium salt and of acrylamide;   crosslinked copolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the potassium salt and of acrylamide;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, of the potassium salt or of the ammonium salt, of acrylic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt and of acrylamide;   crosslinked tetrapolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of N,N-dimethylacrylamide and of acrylamide;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of N,N-dimethylacrylamide and of acrylamide;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylamide and of N-isopropylacrylamide;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylamide and of N-[2-hydroxy-1,1-bis(hydroxymethyl)ethyl]propenamide;   crosslinked tetrapolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylamide and of (2-hydroxyethyl)acrylate;   crosslinked terpolymers of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid partially salified in the form of the sodium salt, the potassium salt or the ammonium salt, of acrylamide and of (2-hydroxyethyl)acrylate.