Abstract A hydrophilic open-celled poly (urea/urethane) sponge derived from a prepolymer produced by the reaction of a polyoxyalkylene polyol with a stoichiometric excess of an organic polysocyanate, said sponge containing substantially uniformly distributed throughout the pores thereof a readily releasable skin care composition and methods of making same and using same for treating skin. It has of course long been known to treat the skin for various purposes by applying thereto a skin care composition, such application being commonly effected by first impregnating an absorbent fibrous pad or sponge applicator with the composition, or supplying a quantity of such composition to the surface of the pad or sponge applicator, and then transferring said composition to the skin by wiping and rubbing same with the applicator. This method is subject to certain disadvantages, among which are the tiresome and time-consuming repetitive step of first supplying the applicator with a quantity of the composition, the difficulty of controlling the amount of composition so applied to the skin, the tendency to permanently or temporarily misplace the container holding the composition, and the like.
A method of preparing hydrophilic open-celled poly (urea/urethane) sponge comprising reacting (a) a prepolymer having an average NCO functionality greater than 2 and produced by reaction of a polyoxyethylene polyol with a stoichiometric excess of an organic polyisocyanate, with (b) about 30 to 200% of water by weight of said prepolymer, said water containing about 6 to 100%, by weight of said prepolymer, of a readily releasable skin care composition, said sponge thereby containing said skin care composition substantially uniformly distributed throughout the pores thereof.
Claim 2
Independent Claim
85 words
A method of preparing hydrophilic open-celled poly (urea/urethane) sponge comprising reacting (a) a prepolymer having an average NCO functionality greater than 2 and produced by reaction of a polyoxyethylene polyol with a stoichiometric excess of an organic polyisocyanate, with (b) about 30 to 200% of water by weight of said prepolymer, said water containing about 6 to 100%, by weight of said prepolymer, of a readily releasable skin care composition, said sponge thereby containing said skin care composition substantially uniformly distributed throughout the pores thereof.
Claim 3
Dependent Claim
14 words
A method as defined in claim 1 wherein said organic polyisocyanate is tolylene diisocyanate.
Claim 4
Dependent Claim
21 words
A method as defined in claim 1 wherein said organic polyisocyanate is an 80:20 isomeric mixture of 2,4- and 2,6-tolylene diisocyanate.
Claim 5
Dependent Claim
28 words
A method as defined in claim 1 wherein said composition contains at least one member of the group consisting of emollient oils, emollient solids and surface active agents.
Claim 6
Dependent Claim
15 words
A method as defined in claim 1 wherein said composition contains a surface active agent.
Claim 7
Dependent Claim
14 words
A method as defined in claim 5 wherein said surface active agent is nonionic.
Claim 8
Dependent Claim
16 words
A method as defined in claim 5 wherein said surface active agent is polyoxyethylenated polyoxypropylene glycol.
Claim 9
Dependent Claim
16 words
A method as defined in claim 5 wherein said composition also contains an emollient mineral oil.
Claim 10
Dependent Claim
17 words
A method as defined in claim 5 wherein said composition also contains a solid emollient lanolin compound.
Claim 11
Dependent Claim
16 words
A method as defined in claim 9 wherein said composition also contains an emollient mineral oil.