US 9,539,554 B2 · Method of making oil-in-water emulsified composition using corona-core microgel emulsifying agent

Abstract

The present invention provides a corona-core microgel emulsifying agent composed of a copolymer obtained by polymerizing polyethylene oxide macromonomers, hydrophobic monomers, and cross-linking monomers under specific conditions as well as an oil-in-water emulsified composition characteristically using said emulsifying agent for emulsification. The object of the present invention is to provide a new corona-core microgel emulsifying agent to be used to prepare an oil-in-water emulsified composition that manifests superior emulsification stability, stability over time, and low skin irritation, and is free of stickiness at the time of application, manifests dewy freshness, is free of powdery sensation and/or squeakiness, and is superior in durability of fragrance, as well as an oil-in-water emulsified composition emulsified with said emulsifying agent.

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Claims4

Dependent claims

A method of preparing an oil-in-water Pickering emulsion comprising

a corona-core microgel emulsifying agent in an amount of 0.1-3 wt % of the total amount of the oil-in-water Pickering emulsion,
an oil phase ingredient in an amount of 10-80 wt % of the total amount of the oil-in-water Pickering emulsion, and
a water phase ingredient,
wherein the corona-core microgel emulsifying agent is composed of a copolymer obtained by polymerizing polyethylene oxide macromononiers of the following formula (1), hydrophobic monomers of the following formula (2), and cross-linking monomers of the following formula (3) under the following conditions (A) and (B):
(A) a mole ratio of a feed mole amount of said polyethylene oxide macromonomers/a feed mole amount of the hydrophobic monomers is 1:10-1:250;
and
(B) a feed amount of said cross-linking monomers is 0.1-1.5 wt % relative to a feed amount of said hydrophobic monomers;
R1 denotes an alkyl having 1-3 carbon atoms, n is an integer 8-200, and X denotes H or
R2 denotes an alkyl having 1-3 carbon atoms, and R3 denotes an alkyl having 1-12 carbon atoms;
and
R4 and R5 each independently denote an alkyl having 1-3 carbon atoms, and m is a number 0-2;
and
wherein a core part is cross-linked with cross-linking monomers to prepare the microgel by using polymer fine particle polymerization method;
the method comprising the steps of:
mixing and dispersing the corona-core microgel emulsifying agent in water or the water phase ingredient to form a dispersion;
adding the oil phase ingredient to the dispersion to form a mixture;
and
emulsifying the mixture by stirring and applying shearing force.

15 more elements

Dependencies are inferred from the claim text.

Description13,770 words

Summary1,948 words

#The present invention relates to a corona-core microgel emulsifying agent and an oil-in-water emulsified composition emulsified with said emulsifying agent. More specifically, it relates to an emulsifying agent that makes it possible to prepare an oil-in-water emulsified composition that is superior in emulsification stability and texture, as well as the oil-in-water emulsified composition thereof.

#In order to disperse liquid into another liquid, the addition of a surfactant (emulsifying agent) is usually required. An emulsifying agent has an amphiphilic molecular structure, which is composed of a polar (hydrophilic) molecular part and a nonpolar (hydrophobic) molecular part, which are spatially separated from each other.

#Oil-in-water emulsions used in cosmetics and such stably mix the water-based ingredients and oil-based ingredients using the emulsifying action of the added surfactant. That is, finely dispersed liquid drops of the oil phase are surrounded by shells of the emulsifying agent and the outer phase is the water phase that is the continuous phase; this is said to be the reason for superior texture that gives a dewy fresh tactile sensation.

Brief description of the drawings1 figure

#FIG. 1 is an illustration showing the mechanism of generation of the corona-core microgel emulsifying agent of the present invention.

Detailed description11,802 words

#Embodiments of the present invention is described in detail below.

#“Regarding the Copolymer that Constitutes (a) the Corona-Core Microgel Emulsifying Agent of the Present Invention”

#The corona-core microgel emulsifying agent of the present invention is a microgel composed of a copolymer obtained by polymerizing monomers represented by formulas (1)-(3). Methods for preparing a microgel composed of said copolymer are reported in Patent Document 8, Non-Patent Document 4 and such.

Facts

Application

14/851,195Filed 11 Sep 2015 · division

Priority

JP 2011-28129422 Dec 2011

Published

US 2016/0001244 A17 Jan 2016

Granted

10 Jan 2017

Term ends

21 May 2034

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification26 codes

A61K 8/062
Emulsions: oil-in-water emulsions
A61K 8/8152
Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon…:…
A61K 8/91
Containing organic macromolecular compounds: graft copolymers
A61Q 13/00
Formulations or additives for perfume preparations

Family

PCT/JP2012/076781Parent of this division · filed 17 Oct 2012

US 2016/0001244 A1Pre-grant publication · published 7 Jan 2016

Application14/359,635Parent of this division

US 2014/0343170 A1Published application

US 9,539,553 B2Related patent

US 9,539,554 B2This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

22 Dec 2011Priority claimedJP 2011-281294
11 Sep 2015Application filedUS 14/851,195
11 Sep 2015Assigned to Shiseido Company, Ltd.assignment of assignor's interest
7 Jan 2016PublishedUS 2016/0001244 A1
10 Jan 2017GrantedUS 9,539,554 B2
12 Oct 2026TodayWithin its term
21 May 2034Term endsEstimated

Method of making oil-in-water emulsified composition using corona-core microgel emulsifying agent

Life of this patent

Method of making oil-in-water emulsified composition using corona-core microgel emulsifying agent

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims4

Description13,770 words

Classification26 codes

Life of this patent

Drawings

Description13,770 words