Method of improving ultraviolet radiation absorption of a composition

• US 5,663,213 A
• Filed: 08/24/1995
• Issued: 09/02/1997
• Est. Priority Date: 02/28/1994
• Status: Expired due to Term

• Current Assignee: Rohm and Haas Company (Dow, Inc.)
• Original Assignee: Rohm and Haas Company (Dow, Inc.)
• Inventors: Fasano, David Michael, Aviles, Rafael Gonzalez, Vogel, Martin, Jones, Charles Elwood
• Primary Examiner(s): Morgan, Kriellion S.
• Application Number:
  US08/518,698
• Time in Patent Office: 740 Days
• Field of Search: 523/105, 523/122, 523/201, 514/772.3, 424/60, 424/78.08, 424/419, 424/501, 424/642
• US Class Current: 523/105
• CPC Class Codes: A61K 2800/413 Nanosized, i.e. having sizes below 100 nm
• CPC Class Codes: A61K 2800/54 Polymers characterized by specific structures/properties
• CPC Class Codes: A61K 8/72 containing organic macromolecular compounds
• CPC Class Codes: A61K 8/8152 Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers
• CPC Class Codes: A61P 17/16 Emollients or protectives, e.g. against radiation
• CPC Class Codes: A61Q 17/04 Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
• CPC Class Codes: B82Y 5/00 Nanobiotechnology or nanomedicine, e.g. protein engineering or drug delivery

Abstract

A method is disclosed for improving the UV radiation absorption of a composition containing a UV radiation absorbing agent by adding from about 0.1 weight percent to about 50 weight percent of latex particles, based on total weight nonvolatiles. The latex particles contain a void and have a particle size of from about 100 nm to about 380 nm.

Claims

1. A method for improving UV radiation absorption of a composition, comprising:

adding to said composition from about 0.1 weight percent to about 50 weight percent of latex particles, based on total weight nonvolatiles, wherein the composition comprises at least one UV radiation absorbing agent, wherein the latex particles contain a void and have a particle size of from about 100 nm to about 380 nm, and wherein the latex particles are added to increase the UV radiation absorption of the composition.

2. The method of claim 1, wherein the latex particles are added to said composition to provide a level from about 1.0 weight percent to about 20 weight percent of the latex particles in said composition.

3. The method of claim 1, wherein the particle size of the latex particles is from about 150 nm to about 375 nm.

4. The method of claim 1, wherein the particle size of the latex particles is from about 190 nm to about 350 nm.

5. The method of claim 1 wherein the latex particles have a void fraction of from about 0.1% to about 50%.

6. The method of claim 1 wherein the latex particles have a void fraction of from about 5% to about 50%.

7. The method of claim 1 wherein the UV radiation absorbing agent is a chemical selected from the group consisting of oxybenzone, dioxybenzone, sulisobenzone, menthyl anthranilate, para-aminobenzoic acid, amyl para-dimethylaminobenzoic acid, octyl para-dimethylaminobenzoate, ethyl 4-bis (hydroxypropyl) para-aminobenzoate, polyethylene glycol (PEG-25) para-aminobenzoate, ethyl 4-bis (hydroxypropyl) aminobenzoate, diethanolamine para-methyoxycinnamate, 2-ethoxyethyl para-methoxycinnamate, ethylhexyl para-methoxycinnamate, octyl paramethoxycinnamate, isoamyl para-methoxycinnamate, 2-ethylhexyl 2-cyano-3,3-diphenyl-acrylate, 2-ethylhexyl salicylate, homomenthyl salicylate, glyceryl aminobenzoate, triethanolamine salicylate, digalloyl trioleate, lawsone with dihydroxyacetone, 2-phenylbenzimidazole-5-sulfonic acid, benzylidine camphor, avobenzone, titanium dioxide and zinc oxide.