Aqueous dispersions of resins, their use in cosmetics, and cosmetic compositions obtained therefrom
AssigneeL'oreal
InventorsNathalie Mougin, Jean Mondet
Life of this patent
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Abstract
Aqueous dispersions of resins of natural origin, their use in cosmetic compositions and cosmetic compositions obtained therefrom.
Claims15
A stable aqueous dispersion of spherical particles of resin of natural origin, said spherical particles comprising one or more resins, said one or more resins being shellac resin, sandarac gum, elemi, or copals.
A process for preparing a stable aqueous dispersion of spherical particles of shellac resin, comprising the steps of:
- (a) dissolving said resin in an organic solvent;
- (b) adding water to the solution formed in step (a) in order to form an emulsion;
- (c) partially neutralizing the ionizable groups of said resin, said partial neutralization occurring before or during addition of water to said resin, said addition of water forming a self-stabilized emulsion with said resin;
- and
- (d) evaporating the organic solvent.
A process for preparing a stable aqueous dispersion of spherical particles of sandarac gum, comprising the steps of:
- (a) dissolving the gum in an organic solvent to form a solution;
- (b) adding water to said solution to form an emulsion of particles of said gum and a surfactant to stabilize said emulsion;
- (c) homogenizing said emulsion to reduce the size of said particles;
- and
- (d) evaporating the solvent.
A cosmetic composition comprising a stable aqueous dispersion of spherical particles of resin of natural origin, said spherical particles comprising one or more resins, said one or more resins being shellac resin, sandarac gum, elemi, or copals.
A stable aqueous dispersion of spherical particles of resin of natural origin, said spherical particles comprising one or more resins, said one or more resins being shellac resin, sandarac gum, elemi, dammars or copals, wherein said dispersion of improved stability is obtained by a process comprising the steps of:
- (a) dissolving said resin in an organic solvent;
- (b) adding water to the solution obtained in step (a) to form an emulsion, optionally adding a surfactant to stabilize said emulsion;
- (c) optionally partially neutralizing the resin before or during the addition of water in step (b);
- and
- (d) evaporating said organic solvent.
A cosmetic composition comprising a stable aqueous dispersion of spherical particles of resin of natural origin, said dispersion comprising one or more resins said one or more resins being shellac resin, sandarac gum, elemi, dammars or copals, wherein said stable dispersion is obtained by a process comprising the following steps:
- (a) dissolving said resin in an organic solvent;
- (b) adding water to the solution obtained in step (a) to form an emulsion;
- optionally adding a surfactant to stabilize said emulsion;
- (c) optionally partially neutralizing the resin before or during the addition of water in step (b);
- and
- (d) evaporating said organic solvent.
A process for preparing a stable aqueous dispersion of particles of resin of natural origin, comprising one or more resins, said one or more resins being shellac resin, sandarac gum, elemi, dammars or copals, wherein said dispersion of improved stability is obtained by a process comprising the steps of:
- (a) dissolving said resin in an organic solvent;
- (b) adding water to the solution obtained in step (a) to form an emulsion, optionally adding a surfactant to stabilize said emulsion;
- (c) optionally neutralizing the resin before or during the addition of water in step (b);
- and
- (d) evaporating said organic solvent.
Dependencies are inferred from the claim text.