Ultraviolet screening powder and cosmetics

• US 5,582,818 A
• Filed: 01/27/1995
• Issued: 12/10/1996
• Est. Priority Date: 01/27/1994
• Status: Expired due to Fees

• Current Assignee: Asahi Glass Company, Limited (AGC, Inc.), Ajinomoto Co., Inc.
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.), Ajinomoto Co., Inc.
• Inventors: Nakanishi, Noriyuki, Mori, Hiroo
• Primary Examiner(s): Dodson, Shelley A.
• Application Number:
  US08/379,953
• Time in Patent Office: 683 Days
• Field of Search: 423/622, 424/63, 424/69, 424/59, 424/60
• US Class Current: 424/59
• CPC Class Codes: A61K 2800/412 Microsized, i.e. having sizes between 0.1 and 100 microns
• CPC Class Codes: A61K 2800/612 By organic compounds
• CPC Class Codes: A61K 8/025 Explicitly spheroidal or spherical shape
• CPC Class Codes: A61K 8/25 Silicon; Compounds thereof
• CPC Class Codes: A61K 8/27 Zinc; Compounds thereof
• CPC Class Codes: A61K 8/29 Titanium; Compounds thereof
• CPC Class Codes: A61K 8/44 Aminocarboxylic acids or derivatives thereof, e.g. aminocarboxylic acids containing sulfur; Salts; Esters or N-acylated derivatives thereof
• CPC Class Codes: A61Q 17/04 Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
• CPC Class Codes: C01P 2004/32 Spheres
• CPC Class Codes: C01P 2004/61 Micrometer sized, i.e. from 1-100 micrometer
• CPC Class Codes: C01P 2004/62 Submicrometer sized, i.e. from 0.1-1 micrometer
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C01P 2006/14 Pore volume
• CPC Class Codes: C01P 2006/90 Other properties not specified above
• CPC Class Codes: C09C 1/0081 Composite particulate pigments or fillers, i.e. containing at least two solid phases, except those consisting of coated particles of one compound C09C1/0015, C09C1/0078 take precedence
• CPC Class Codes: C09C 1/0084 containing titanium dioxide
• CPC Class Codes: C09C 1/309 Combinations of treatments provided for in groups C09C1/3009 - C09C1/3081

Abstract

Herein disclosed are cosmetics having spherical silica containing an ultraviolet reflecting meterial surface-treated with platy N-lauroyl-L-lysine incorporated therein. According to the present invention, those cosmetics having spherical silica containing a conventional ultraviolet reflecting material blended therewith are improved in cosmetic functions such as spreadability upon application, lubricity upon application, smooth feeling on skins, adhesiveness to skins, water repellency, feeling, etc., maintaining the original ultraviolet screening effect.

Claims

1. An ultraviolet screening powder comprising:

porous spherical silica particles having an average particle diameter of 1 to 50 μ

m,

a pore volume of from 0.01 to 3 cc/g,

5 to 300% by weight, based on said silica, of an ultraviolet reflecting metal oxide selected from the group consisting of titanium oxide, zinc oxide, cerium oxide and mixtures thereof, and

0.05 to 90% by weight, based on said silica, of platy N-lauroyl-L-lysine of about 1 to 30 μ

m.

2. The ultraviolet screening powder of claim 1, wherein the pore volume of said silica is from 0.5 to 2.5 cc/g, its average particle diameter is 2 to 20 μ

m, the amount of ultraviolet reflecting metal oxide is from 20 to 100% by weight based on said silica and the amount of N-lauroyl-L-lysine is from 0.5 to 75% by weight, based on said silica.

3. The ultraviolet screening powder of claim 1, containing two or more metal oxides.

4. A cosmetic comprising an ultraviolet screening powder of claim 1, 2 or 3.