An apparatus for preparing a cosmetic composition containing an emulsion substance formed by instant emulsification through a microfluidic channel is provided. The apparatus includes a housing defining the appearance of the apparatus and installed with a pump on one side, the pump being operated by a user; an external-phase chamber provided in the housing, and storing an external-phase fluid forming the external phase of the emulsion substance; a dispersed-phase chamber provided in the housing, and storing a dispersed-phase fluid forming the dispersed phase of the emulsion substance. The apparatus further includes a microfluidic channel providing a path for the external-phase fluid and the dispersed-phase fluid to flow for forming the emulsion substance by combining the external-phase fluid with the dispersed-phase fluid; and a tube for discharging the emulsion substance from the microfluidic channel.

[Problem] An objective of the present invention is to provide a water-in-oil emulsion sunscreen cosmetic that allows a medicinal agent to be blended into the internal phase, while having high ultraviolet protection power. [Solution] The sunscreen cosmetic of the present invention is characterized by comprising: (A) an ultraviolet absorbing agent; (B) a medicinal agent selected from the group consisting of L-ascorbic acid and derivatives thereof, tranexamic acid and derivatives thereof, alkoxysalicylic acid and derivatives thereof, glycyrrhizinic acid and derivatives thereof, and nicotinic acid and derivatives thereof; (C) a water-soluble thickener that is not sugar-derived; and (D) water.

A sunscreen composition in the form of a water-in-oil emulsion comprising: a) a water phase of about 20% to 60% by weight relative to the total weight of the sunscreen composition; b) one or more mineral UV filtering agents; c) one or more oil thickening agents selected from poly C10-30 alkyl acrylate, hydrogenated jojoba oil and its derivatives and mixtures thereof; wherein the total amount of oil thickening agents is about 0.5% to about 4% by weight relative to the total weight of the sunscreen composition; wherein when hydrogenated jojoba oil is present, the amount of hydrogenated jojoba oil is no more than 1.5 times the amount of poly C10-30 alkyl acrylate; wherein the composition has a viscosity of about 0.1 Pa.Math.s to about 5 Pa.Math.s at 25° C. at 10 rad/s; and wherein the inflection point of the largest viscosity transition at 10 rad/s is between 30° C. to 40° C.

Composition for topical use including a gelled phase dispersed in a continuous phase, with: the gelled phase including a diol having 3-8 atoms and represented either by formula (Ia): R.sup.a1-C(R.sup.b1)(OH)—C(OH)(R.sup.c1)(R.sup.d1) (Ia), in which each of the Ra1, Rb1, Rc1 and Rd1 radicals represent, independently of one another, a hydrogen atom or saturated aliphatic radical having 1-5 carbon atoms, or by formula (Ib): R.sup.a1-C(R.sup.b1)(OH)—[C(R.sup.e1)(R.sup.f1)]t-C(OH)(R.sup.c1)(R.sup.d1) (Ib), in which t is equal to one, two or three, each of the R.sup.a1, R.sup.b1, R.sup.c1, R.sup.d1, R.sup.e1 and R.sup.f1 radicals represent, independently of one another, a hydrogen atom or saturated aliphatic radical having 1-5 carbon atoms, it being understood that at least one of the Ra1 or Rb1 radicals and/or at least one of the Rc1 or Rd1 radicals do not represent a hydrogen atom, and —a fatty phase including an oil, an emulsifying surfactant system and an emulsifying surfactant.

Composition for topical use including a gelled phase dispersed in a continuous phase, with: the gelled phase including a diol having 3-8 atoms and represented either by formula (Ia): R.sup.a1-C(R.sup.b1)(OH)—C(OH)(R.sup.c1)(R.sup.d1) (Ia), in which each of the Ra1, Rb1, Rc1 and Rd1 radicals represent, independently of one another, a hydrogen atom or saturated aliphatic radical having 1-5 carbon atoms, or by formula (Ib): R.sup.a1-C(R.sup.b1)(OH)—[C(R.sup.e1)(R.sup.f1)]t-C(OH)(R.sup.c1)(R.sup.d1) (Ib), in which t is equal to one, two or three, each of the R.sup.a1, R.sup.b1, R.sup.c1, R.sup.d1, R.sup.e1 and R.sup.f1 radicals represent, independently of one another, a hydrogen atom or saturated aliphatic radical having 1-5 carbon atoms, it being understood that at least one of the Ra1 or Rb1 radicals and/or at least one of the Rc1 or Rd1 radicals do not represent a hydrogen atom, and —a fatty phase including an oil, an emulsifying surfactant system and an emulsifying surfactant.

The present invention provides a water-in-oil cosmetic preparation which contains: (a) from 0.1% by mass to 3% by mass of a substance that is selected from among alkyl-modified/partially crosslinked polyether-modified silicones and alkyl-modified/partially crosslinked polyglycerol-modified silicones; (b) from 0.05% by mass to 0.8% by mass of an uncrosslinked alkyl branched polyether-modified silicone; (c) from 30% by mass to 90% by mass of an aqueous component; and (d) from 5% by mass to 30% by mass of an oil component.

This water-in-oil cosmetic preparation has excellent emulsion stability even in cases where an oil component such as a hydrocarbon oil or an ester oil is contained therein in a large amount, while exhibiting good spreadability since the emulsified state thereof is smoothly broken upon application, and enabling the achievement of water breaking sensation and excellent feeling of use.

The present invention relates to a water-in-oil cosmetic composition with maximized feeling of moisture and refreshment and, more particularly, to a water-in-oil cosmetic composition which includes organically modified clay minerals and polar oils containing at least one ester group having a specific content, so that the stability of emulsified particles is maintained without a separate emulsifier, thus reducing skin irritation during application and forming water drops to enhance visual aesthetics and maximize feeling of moisture and refreshment.

A water-in-oil emulsion cosmetic free of stickiness and oiliness, having semi-transparent or transparent appearance to effect feel of freshness, and able to provide moisturized feel is provided. The water-in-oil emulsion cosmetic contains (a) a solid moisturizer, (b) a polyether-modified silicone, and (c) a silicone oil having a refractive index in the range from 1.380 to 1.420 at 25° C., wherein a moisturizer content is 22 mass % or more relative to the total amount of the cosmetic.

To provide a water-in-oil emulsified composition which highly encapsulates a water content, has high viscosity, and is excellent in emulsification stability.

The water-in-oil emulsified composition of the present disclosure comprises a dispersion medium comprising an oil content, and an oil-soluble copolymer having a monomer unit obtained from a specific hydrophilic monomer, and a monomer unit obtained from a specific hydrophobic monomer; and water droplets dispersed in the dispersion medium, wherein the oil content contains 60% by mass or more of polar oil with an IOB of 0.10 or more, and wherein the water droplets contain water and a surfactant, and the content of the water is 30% by mass or more based on the total amount of the composition.

Compositions contain boron nitride nanomaterials at least partially coated with biomolecules.