Method for applying a cosmetic agent by electrostatic spraying

• US 5,945,111 A
• Filed: 10/14/1997
• Issued: 08/31/1999
• Est. Priority Date: 11/18/1992
• Status: Expired due to Fees

• Current Assignee: Unilever Patent Holdings BV (Unilever PLC)
• Original Assignee: Unilever Patent Holdings BV (Unilever PLC)
• Inventors: Esser, Isabelle C.
• Primary Examiner(s): Bawa, Raj
• Application Number:
  US08/949,858
• Time in Patent Office: 686 Days
• Field of Search: 424/401, 424/45, 424/47, 424/78.02, 424/78.03, 424/70.1, 424/70.11, 424/59, 424/65, 514/937
• US Class Current: 424/401
• CPC Class Codes: A45D 2200/057 Spray nozzles; Generating atomised liquid
• CPC Class Codes: B05B 5/025 Discharge apparatus, e.g. electrostatic spray guns
• CPC Class Codes: B05B 5/1608 the liquid or other fluent material being electrically conductive
• CPC Class Codes: B05B 5/1691 Apparatus to be carried on or by a person or with a container fixed to the discharge device
• CPC Class Codes: B05D 1/045 on non-conductive substrates

Abstract

A method of delivering a cosmetic agent to the body, comprising electrostatically spraying thereon a cosmetic composition comprising said cosmetic agent, the composition having a resistivity of less than 10⁴ ohm cm. Apparatus for carrying out the method comprises a reservoir for the composition, delivery means, a voltage generator, and control means for applying the voltage from the generator to the delivery means to electrostatically spray the composition. The cosmetic agent may comprise an antiperspirant or other type of personal cosmetic product.

Claims

1. A method of delivering a cosmetic agent to skin or hair, comprising electrostatically spraying on the skin or hair, droplets of a cosmetic composition comprising said cosmetic agent using a voltage in the range of about 3 to about 20 kilovolts, the composition having a resistivity of less than 10⁴ ohm cm and the average size of the droplets of the electrostatic spray being in the range of 50 to 400 μ

m.

2. A method according to claim 1, comprising:

(a) providing an apparatus which includes;

(i) a reservoir containing said electrostatically sprayable cosmetic composition comprising said cosmetic agent and having a resistivity of less than 10⁴ ohm cm;

(ii) at least one delivery means in communication with the reservoir;

(iii) a high voltage generator powered from an electricity source;

(iv) trigger means for selectively applying the high voltage from the generator to the delivery means; and

(b) actuating the said trigger means to electrostatically spray the cosmetic composition from the delivery means onto the body at an intended site.

3. A method according to claim 1 or claim 2, wherein the cosmetic composition comprises one or more charged compounds which reduce the resistivity of the composition to below 10⁴ ohm cm.

4. A method according to claim 3, wherein the charged compound is the said cosmetic agent.

5. A method according to claim 4, wherein the charged cosmetic agent is selected from the group consisting of antiperspirant actives;

antimicrobial/antibacterial agents;

ionic antidandruff agents; and

mixtures of any of the foregoing agents.

6. A method according to claim 3, wherein the charged compound is other than the said cosmetic agent.

7. A method according to any one of claims 3 to 6, wherein the composition comprises the said charged compound in an amount sufficient to give the composition the said resistivity of less than 10⁴ ohm cm.

8. A method according to any one of claims 3 to 7, wherein the charged compound is a salt.

9. A method according to any preceding claim, wherein the cosmetic composition comprises at least 80% by weight of one or more solvents.

10. A method according to claim 1, wherein the cosmetic composition comprises a system selected from the group consisting of inorganic or organic salt(s) in water/ethanol mixtures;

antiperspirant solutions;

antidandruff or hair growth compositions;

enzyme solutions;

bactericide solutions; and

mixtures of any of the foregoing systems.

11. A method according to claim 1, wherein the average droplet size is in the range 50 to 200 μ

m.