"CORE-SHELL" TYPE MICROGEL EMULSIFIER AND "OIL-IN-WATER" EMULSION COMPOSITION Russian patent published in 2017 - IPC B01J13/14 B01F17/34 C08F290/06 C08F283/06 C08F220/10 A61K8/06 

FIELD: chemistry.

SUBSTANCE: described is a cosmetic composition in form of a Pickering type "oil-in-water" emulsion for skin or hair, containing a "core-shell" type microgel emulsifier, oil phase ingredients and aqueous phase ingredients, where "core-shell" type microgel emulsifier consists of a copolymer, typically obtained by polymerising polyethylene oxide macromonomers of following formula (1), hydrophobic monomers of following formula (2) and cross-linking monomers of following formula (3) in following conditions (A) and (B): (A) molar ratio of initial molar amount of said polyethylene oxide to initial molar amount of hydrophobic monomers is 1:10–1:250, (B) initial amount of said cross-linking monomers is 0.1–1.5 wt% with respect to initial amount of said hydrophobic monomers; (1), where R₁ denotes alkyl having 1–3 carbon atoms, and n is an integer from 8 to 200, X denotes H or CH₃; (2), where R₂ denotes alkyl having 1–3 carbon atoms, and R₃ denotes alkyl having 1–12 carbon atoms; (3), where R₄ and R₅ each independently denotes alkyl having 1–3 carbon atoms, and m is a number from 0 to 2, where amount of "core-shell" type microgel emulsifier is 0.01–10 wt% with respect to total amount of composition in form of Pickering emulsion. Also described is a method of producing said cosmetic composition in form of a Pickering type "oil-in-water" emulsion, which includes: mixing and dispersing "core-shell" type microgel emulsifier in water or aqueous phase ingredients, adding oil phase ingredients and other ingredients, and emulsifying mixture by mixing and applying a shear force. Invention also describes use of said "core-shell" type microgel emulsifier for producing a cosmetic composition in form of Pickering type "oil-in-water" emulsion for skin or hair.

EFFECT: obtaining a composition in form of emulsion with improved emulsification stability, with low skin irritation and low sensation scratchiness and powderiness.

5 cl, 1 dwg, 14 tbl, 20 ex