Method for producing coating film

Patent metadata

Field	Value
Publication number	US-11351402-B2
Application number	US-201816606373-A
Country	US
Kind code	B2
Filing date	Apr 19, 2018
Priority date	Apr 19, 2017
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

A method for producing a film of the present invention includes the step of electrostatically spraying a liquid composition directly on the surface of skin using an electrostatic spray device to form a film on the skin. The electrostatic spray device includes a container capable of storing the liquid composition, a nozzle configured to eject the liquid composition, a power supply configured to apply a voltage to the nozzle, and a voltage stabilizer configured to stabilize the voltage applied by the power supply to the nozzle. The liquid composition contains component (a): one or more volatile substances selected from alcohols and ketones, and component (b): a polymer having film formability.

First claim

The invention claimed is:

1. A method for producing a film, the method comprising:
electrostatically spraying a liquid composition directly on a surface of skin using an electrostatic spray device to form the film on the skin, wherein
the electrostatic spray device includes:
a container capable of storing the liquid composition,
a nozzle configured to eject the liquid composition,
a power supply configured to apply a voltage to the nozzle, and
a voltage stabilizer configured to stabilize the voltage applied by the power supply to the nozzle,

the liquid composition contains component (a) and component (b):
(a) one or more volatile substances selected from alcohols and ketones, and
(b) a polymer having film formability, and

in said electrostatic spraying, the liquid composition is electrostatically sprayed on skin using the electrostatic spray device to form a porous film formed of deposited fibers.

2. The method for producing the film according to claim 1 , wherein the voltage stabilizer includes:
a voltage detector configured to detect the voltage applied to the nozzle,
a comparator configured to compare the voltage detected by the voltage detector to a reference voltage to determine a difference therebetween and to output a signal, and
a voltage controller configured to control the voltage of the power supply on the basis of the signal output from the comparator.

3. The method for producing the film according to claim 2 , wherein
the liquid composition further contains water as component (c), and
a mass ratio of a content of the component (b) to a content of the component (c) is 0.4 or more and 50 or less.

4. The method for producing the film according to claim 2 , wherein
the liquid composition further contains water as component (c),
a content of the component (a) in the liquid composition is 50% by mass or more and 94% by mass or less,
the component (b) is dissolvable in the component (a), and
a content of the component (c) in the liquid composition is 0.2% by mass or more and 25% by mass or less.

5. The method for producing the film according to claim 2 , further comprising applying, in a direction of the skin, a liquid agent that contains one or more substances selected from water, a polyol, and an oil that is liquid at 20° C., wherein the liquid agent differs from the liquid composition.

6. The method for producing the film according to claim 5 , wherein
in said electrostatic spraying, a porous film formed of deposited fibers is formed, and then
in said applying the liquid agent, the liquid agent is applied onto the porous film to form a liquid agent-supporting film in which the liquid agent is supported among the fibers forming the porous film and/or on a fiber surface.

7. The method for producing the film according to claim 5 , wherein in said applying the liquid agent, the liquid agent is applied onto the film to maintain transparency of the film.

8. The method for producing the film according to claim 5 , further comprising:
applying a cosmetic containing a powder onto a surface of skin,
wherein after said applying the cosmetic said electrostatic spraying is performed.

9. The method for producing the film according to claim 1 , wherein the electrostatic spray device further comprises a current limiter configured to stop high voltage generation in the power supply when a current of 2 mA or more flows.

10. The method for producing the film according to claim 1 , wherein the electrostatic spray device further includes a housing, and the housing stores the container, the nozzle, the power supply, and the voltage stabilizer and is to be held with a single hand.

11. A method for producing a film, the method comprising:
electrostatically spraying a liquid composition directly on a surface of skin using an electrostatic spray device to form a film on the skin; and
applying, in a direction of the skin, a liquid agent that contains one or more substances selected from water, a polyol, and an oil that is liquid at 20° C., wherein
the electrostatic spray device includes:
a container capable of storing the liquid composition,
a nozzle configured to eject the liquid composition,
a power supply configured to apply a voltage to the nozzle, and
a voltage stabilizer configured to stabilize the voltage applied by the power supply to the nozzle,

the liquid composition contains component (a) and component (b):
(a) one or more volatile substances selected from alcohols and ketones, and
(b) a polymer having film formability, and

the liquid agent differs from the liquid composition.

Assignees

• Kao Corp

Inventors

• Tojo Takehiko
• Fukuda Ikuo

Classifications

• D01D5/0061

  characterised by the electro-spinning apparatus · CPC title

• A61K8/34

  Alcohols · CPC title

• D01D5/0084

  Coating by electro-spinning, i.e. the electro-spun fibres are not removed from the collecting device but remain integral with it, e.g. coating of prostheses · CPC title

• D01D5/0038

  the fibre formed by solvent evaporation, i.e. dry electro-spinning · CPC title

• A61K2800/95

  Involves in-situ formation or cross-linking of polymers · CPC title