Waterproof sunscreen compositions
OwnerVictor Palinczarinventor
Life of this patent
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Abstract
An effective aesthetic water-proof sunscreen composition which includes ultraviolet light protection to the skin includes water in an amount from 15% up to about 95% by weight, from about 1% to about 30% by weight of an active sunscreen agent, from about 0.1% to about 6.0% by weight of ethylcellulose, from about 0.01% to about 12% of weight by a surface active agent, and from about 0.03% to about 5.0% by weight of an alkaline dispersion promoting agent. The composition may optionally contain up to about 25% by weight of water-soluble organic liquids; up to about 20% by weight of water-insoluble emollients; up to about 20% by weight of suspended particulate matter; up to 8% by weight of plasticizers; up to 5% by weight of a thickening agent; and up to about 3% by weight of fragrance oil.
Claims35
A water-proof sunscreen composition comprising:
- A. from about 15% to about 95% by weight of water;
- B. from about 0.1% to about 6.0% by weight of ethylcellulose polymer having an average ethoxyl substitution of about 2.25 to about 2.58 on each anhydroglucose unit which equates to an ethoxyl content from about 45% to about 52%;
- C. from about 1.0% to about 30.0% by weight of an active ultraviolet radiation absorber;
- D. from about 0.01% to about 12% by weight of a surface active agent;
- and
- E. from about 0.03% to about 5.0% by weight of an alkaline dispersion promoting agent.
A water-proof sunscreen composition consisting of active ultraviolet radiation absorbers comprising:
- A. from about 0.5% to about 2.0% by weight of ethylcellulose polymer having an average ethoxyl substitution of about 2.25 to about 2.58 on each anhydroglucose unit which equates to an ethoxyl content from about 45.0% to about 52.0% and a viscosity polymer molecule designation from about 4 to about 50;
- B. from about 25% to about 85% by weight of water;
- C. from about 2% to about 16% by weight of an active ultraviolet radiation absorber selected from a 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 benzalphthalide.
- D. from about 0.2% to about 5.0% by weight of a plasticizer selected from a group consisting of dibutyl sebacate and dibutyl phthalate;
- E. from about 0.1% to about 1.0% by weight of an alkaline dispersion promoting agent selected from a group consisting of diisopropanol-amine and ammonium hydroxide;
- F. from about 0.5% to about 8% by weight of a surface active agent selected from a group consisting of ammonium myristate, potassium oleate, triethanolamine stearate, sodium lauryl sulfate, polyoxyethylene sorbitan monolaurate and polyoxyethylene nonyl phenyl ether;
- G. from about 0.5% to about 2% by weight of a thickening agent selected from a group consisting of xanthan gum, hydroxyethylcellulose, an acrylic acid cross-linked polymer, modified copolymer of methyl vinyl ether and maleic anhydride, fumed silica, amorphous silica, sodium magnesium silicate and colloidal magnesium aluminum silicate;
- H. from about 4.0% to about 10% by weight of a water-insoluble emollient selected from a group consisting of cetyl alcohol, oleic acid, diisopropyl adipate, polyoxypropylene (14) butyl ether, mineral oil, and dimethylpolysiloxane;
- I. from about 5.0% to about 15% by weight of a water-soluble liquid organic compound selected from a group consisting of ethanol, isopropanol, propylene glycol, glycerol, glycerol triacetate and diethylene glycol monoethyl ether;
- and
- J. from about 5.0% to about 15% by weight of suspended particulate solid matter selected from a group consisting of aluminumized acrylic polyester, and metallic oxides.
A process for preparing a water-proof sunscreen composition which comprises from 15% to about 95% water, from about 0.1% to about 6% by weight of ethylcellulose polymer having an average ethoxyl substitution of about 2.25 to about 2.58 on each anhydroglucose unit which equates to an ethoxyl content from about 45% to about 52%, from about 1% to about 30% by weight of an active sunscreen agent, from about 0.1% to about 12% by weight of a surface active agent and from about 0.03% to about 5.0% by weight of an alkaline dispersion promoting agent comprising the step of forming a collodial dispersion of ethylcellulose/active sunscreen agent by varying the temperature and the time so that particles are formed having an average diameter of less than 1 micron, that when applied to the skin coalesce, to form a continuous, impervious water-resistant film.
Dependencies are inferred from the claim text.