Waterproof sunscreen compositions
OwnerVictor Palinczarinventor
Life of this patent
Estimating the term…
Abstract
An effective, aesthetic water-proof sunscreen composition which provides ultraviolet light protection to the skin includes monohydric alcohols in an amount from 15% up to about 90% by weight, from about 1% to about 30% by weight of an active sunscreen agent, from about 0.1% to about 40.0% by weight of polyamide polymer and from about 0.1% to about 5% by weight of an acrylic acid crosslinked polymer, and from about 0.1% to about 8.0% by weight of an alkaline neutralizing agent. The composition may optionally contain up to about 15% by weight of hydroxyl donors; up to about 20% by weight of water-insoluble emollients; up to about 20% by weight of suspended particulate matter; and up to about 3% by weight of fragrance oil.
Claims21
A water-proof sunscreen composition comprising:
- A. from about 15% to about 90% by weight of a monohydric alcohol;
- B. from about 0.1% to about 40% by weight of a water-insoluble polyamide polymer;
- C. from about 1.0% to about 30% by weight of an active ultraviolet radiation absorber;
- wherein the improvement comprises:
- D. from about 0.1% to about 5.0% by weight of an acrylic acid crosslinked polymer having a molecular weight from about 400,000 to about 5,000,000;
- an average equivalent weight from about 72 to about 80 and a specific gravity from about 1.30 to about 1.50 and represented by the formula (CH.sub.2 CHCOOH).sub.n ';
- and
- E. from about 0.1% to about 5.0% by weight of an alkaline neutralizing agent.
A water-proof sunscreen composition having an active ultraviolet radiation absorber comprising:
- A. from about 0.5.% to about 25% by weight of a polyamide polymer which is the condensation product of at least one polycarboxylic acid and at least one polyamine having a solubility in water of less than 1% at 25 degrees C. and a solubility in monohydric alcohols greater than 5% at 25 degrees C.;
- B. from about 25% to about 85% by weight of a monohydric alcohol selected from the group consisting of ethanol and isopropanol;
- C. from about 2% to about 20% by weight of an active ultraviolet radiation absorber selected from the group consisting of para-aminobenzoic acid;
- 2-ethoxyethyl p-methoxycinnamate;
- diethanolamine p-methoxycinnamate;
- digalloyl trioleate;
- 2,2'-dihydroxy-4-methoxybenzophenone;
- ethyl 4-(bis[hydroxypropyl])-aminobenzoate;
- 2-ethylhexyl salicylate;
- glyceryl aminobenzoate;
- 2-ethylhexyl 2-cyano-3,3 -diphenylacrylate;
- ethylhexyl p-methoxycinnamate;
- 3,3,5-trimethylcyclohexyl salicylate;
- menthyl o-aminobenzoate;
- 2-hydroxy-4-methoxybenzophenone;
- amyl p-dimethylaminobenzoate;
- octyl p-dimethylaminobenzoate;
- 2-phenylbenzimidazole-5-sulfonic acid;
- 5-benzoyl-4-hydroxy-2 methoxybenzene sulfonic acid;
- triethanolamine salicylate;
- 4-tert.-butyl-4-methoxy-dibenzoylmethane;
- and benzalphtalide;
- D. from about 2% to about 10% by weight of a hydroxyl donor which is water;
- E. from about 0.5% to about 15% by weight of suspended particulate solid matter selected from the group consisting of aluminumized acrylic polyester and metallic oxides;
- F. from about 2% to about 15% by weight of a water-insoluble liquid emollient selected from the group consisting of oleic acid, lauryl alcohol, diisopropyl adipate, mineral oil, polybutene, phenyl methyl polysiloxane and polyoxypropylene butyl ether
- wherein the improvement comprises:
- G. from about 0.4% to about 2.5% by weight of an acrylic acid crosslinked polymer having an average molecular weight from about 1,000,000 to about 4,000,000;
- and
- H. from about 0.4% to about 2.5% by weight of an alkaline neutralizing agent selected from a group consisting of di(2-ethylhexyl)amine, amines derived from fatty acids and poly(ethylene glycol)amines derived from fatty acids.
Dependencies are inferred from the claim text.