Emulsion particle-containing aqueous dispersion
AssigneeNippon Shokubai Co., Ltd.
InventorsYohei Imaizumi, Yoshimine Sakamoto
Life of this patent
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Abstract
This aqueous dispersion contains monomer emulsion particles comprising a monomer component, wherein the monomer component contains (A) at least one monomer X selected from the group consisting of styrene-based monomers and alkyl (meth)acrylates including an alkyl group having 4 to 12 carbon atoms, (B) a nonionic emulsifier, (C) an aliphatic organic acid (alkyl ester) having 15 or more carbon atoms, and (D) a lipophilic active component, and the mean particle size of the monomer emulsion particles is 10 to 200 nm.
Claims9
A method for producing an aqueous dispersion comprising monomer emulsion particles comprising a monomer component, the method comprising:
- mixing a monomer component with an aqueous medium, wherein the monomer component comprises:
- (A) a monomer X comprising cyclohexyl (meth)acrylate;
- (B) a nonionic emulsifier;
- (C) an aliphatic organic acid-based compound having 22 to 40 carbon atoms;
- and
- (D) a lipophilic active ingredient;
- heating the resulting mixture to a temperature equal to or higher than a phase inversion-initiating temperature of the mixture and lower than a boiling point of the aqueous medium under stirring;
- and
- cooling the mixture to a temperature lower than the phase inversion-initiating temperature of the mixture,
- wherein the total content of cyclohexyl (meth)acrylate in the monomer X is 50 to 100% by mass,
- a content of the monomer X in the monomer component is 25% by mass or more, and 80% by mass or less,
- a content of the nonionic emulsifier in the monomer component is 10% by mass or more, and 50% by mass or less, and
- an HLB of the nonionic emulsifier is 8 to 17, and
- wherein the nonionic emulsifier is a polyoxyalkylene alkenyl ether.
Dependencies are inferred from the claim text.