Use Urethane Polymers of Castor Oil Skin and Personal Care Product Compositiions

1. Field of the Invention

Castor Oil and Castor Oil derivatives have been used for many years in cosmetic formulations. Esters of Castor Oil have been used as emollients in creams and lotions. Ethoxylated Castor Oils have been used as emulsifiers and solubilizing agents in the textile and cosmetic industries for decades. Ethoxylated/Hydrogenated Castor Oils have also functioned as waxes, emulsifiers and solubilizers and have been in use for the past thirty years in the coating industry where long lasting sheen and durability were of paramount concern. Urethanes based on methylene bisdiisocyanate have been used in the potting industry based on Castor Oil as well.

In the cosmetic industry, Castor Oil derivatives have appeared as amides to increase viscosity and enhance "conditioning" to hair formulations. Castor Oil amides have also functioned as emulsifiers. Sulfosuccinates based on derivatives of Castor Oil have been used for their mildness, foaming ability and anti-dandruff properties in addition to thickening. Betaines as well as amine oxides derived from the dimethylamidopropyl amine derivatives of castor oil have found use in the hair industry as viscosity improvers as well as conditioners, specifically when used on the acid side.

Castor Oil itself has been used as a vehicle in lipstick formulations where its low cost and description as a vegetable derived raw material, its low inherent toxicity and dispersing ability for pigments make it to be an ideal ingredient. Castor Oil is also used in lip glosses widely because of its characteristic property of sheen.

In spite of the wide use of Castor Oil in lipsticks and lip glosses there is a need for raw material in cosmetic formulations, hopefully, to increase adhesion, durability, gloss, increase product stability and exhibit a low order of toxicity. The present invention fulfills the long standing need for a safe, effective cosmetic ingredient demonstrating zero comedogenicity, lack of eye irritation low skin irritation and extremely low LD 50. To date, no existing polymers when evaluated against the subject invention exhibited similar overall familiar properties.

2. Prior Art

a) U.S. Pat. No. 4,797,273 introduces water-in-oil microemulsions suitable for cosmetic use containing moisturizing agents or sunscreens.

b) U.S. Pat. No. 4,839,161 teaches a therapeutic composition for alleviating or preventing sun-induced desquamation.

c) U.S. Pat. No. 4,847,072 presents pharmaceutical compositions containing tocopherol sorbate which are useful in preventing damage to the skin caused by chronic or acute UV exposure.

d) U.S. Pat. No. 4,971,800 shows methods and compositions for enhancing the cutaneous penetration of topically or transdermally delivered pharmacologically active agents.

e) U.S. Pat. No. 5,000,945 preaches UV and UVB absorbing compounds.

f) U.S. Pat. No. 5,008,100 describes oil-in-water emulsions containing polyethylene as sunscreen compositions.

g) U.S. Pat. No. 5,017,365 shows sunscreen compositions and an application system.

h) U.S. Pat. No. 5,032,390 use ZnO in an anti-suntan cosmetic composition.

i) U.S. Pat. No. 5,045,317 deals with methods and compositions for enhancing the cutaneous penetration of topically or transdermally delivered pharmacologically active agents.

j) U.S. Pat. No. 5,051,260 is a C.I.P. of U.S. Pat. No. 4,971,800 again stressing cutaneous penetration of topically or transdermally delivered pharmacologically active agents.

k) U.S. Pat. No. 5,089,250 is titled "Cosmetic Containing Benzotiazole Diorganopolysiloxanes".

l) U.S. Pat. No. 5,116,604 teaches sunscreen compositions containing novel neopentanoate esters.

m) U.S. Pat. No. 5,207,998 discloses sun care compositions.

n) U.S. Pat. No. 5,028,011 indicates various ultraviolet resistant sunscreen formulations.

o) U.S. Pat. No. 5,219,558 provides photoprotection compositions having improved substantively to prevent sunburn and sun-induced premature skin aging.

p) U.S. Pat. No. 5,300,694 introduces alkoxylated compounds then use in cosmetic stick formulation.

q) U.S. Pat. No. 5,302,376 relates to a cosmetic emulsion screening out UV radiation.

r) U.S. Pat. No. 5,338,539 presents benzofuran derivatives.

Castor Oil has long been used in skin and hair formulations. Its use in these formulations suffers from odor and color problems, the bane of skin and hair formulations.

The use of the isophorone diisocyante urethane polymer derived from naturally occurring castor oil introduces a novel compound for these formulations to enhance adhesion, durability, emolliency, as well as gloss to skin and hair products.

This polymer offers new unanticipated synergistic results over and above the use of castor oil, castor oil esters, castor oil ethoxylates and propoylates and linear polyoxypropylene glycol urethanes.

The polymer herein introduced for this use exhibits decreased odor and diminished color making it cosmetically more desirable material than pure castor oil. It exhibits outstanding adhesion to skin and hair, exhibits long lasting emolliencey, enhances gloss for longer periods of time than Castor Oil Esters and other Castor Oil derivatives, assists in enhancing color dispersion, aids in durability, increases payoff in lipsticks and creams, helps to form an impenetrable water film, prevents feathering in lipsticks and helps eliminate bleeding in lipsticks. The urethane polymer of castor oil based on this method of synthesis forms a unique additive for cosmetics which is completely non-comodegeic, nonirritating to the skin and eyes and enhances the life and efficiency of a given cosmetic formulation.

This unique castor oil derivative in lipstick formulations gives the following results:

1. Immensely better dispersion of pigments (as opposed to straight castor oil). This results in an enhancement of color using less pigment therefore reducing raw materials of formulations.

2. Better fill in of the lips using this product as opposed to Castor oil.

3. Increased sheen and gloss as opposed to Castor oil.

4. Better application (glide) with the use of the present polyurethane castor oil formulated lipstick.

5. Increased adhesion and longer lasting lipsticks when based on the present urethane castor oil polymer as opposed to castor oil alone.

6. Increased moisturization of lipsticks when the urethane castor oil polymer is incorporated into lipsticks rather than straight castor oil.

The present invention introduces the use of the reaction product of isophorone disocyanate and purified castor oil in the preparation of cosmetic formulations for the purpose of increased adhesion and tenacity as well as durability to the skin and hair. The inclusion of the present invention in a formulation provides a finished product which is resistant to removal from the skin and hair by repeated washing. Additionally higher gloss in lipsticks and lip glosses have been found when compared to use of castor oil itself as well as other linear polymers.

The preferred embodiment of the invention is as follows: ##STR1##

Naturally occurring Castor Oil has the following composition:

The stoichiometric use of two moles of Castor Oil to one mole of isophorone diisocyanate gives the resulting preferred embodiment of the invention as shown above.

Attached hereto is a technical bulletin giving the physical and chemical data of the instant invention.

Acute oral toxicity test results in rats, under the Federal Hazardous Substances Act according to definitions listed in 16 CFR 1500.3 (c)(2)(i) indicate no toxicity.

Eye irritation tested pursuant to the Federal Hazardous Substances Act, 16 CFR, Section 1500.42 indicate that the material is not considered as primary eye irritant.

Tests of the material pursuant to the Federal Hazardous Substances Act, 16 CFR, Section 1500.3 (c)(4) show that the material introduced is not a primary skin irritant and is non-comedogenic.

Following are sample formulations using the instant invention: