Back to results
US 6,074,632 AGranted
Polyhydric alcohol stabilized antiperspirant salt solutions
AssigneeThe Gillette Company
InventorYan-Fei Shen
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeThe Gillette Company
InventorYan-Fei Shen
Estimating the term…
The present invention relates to methods of making enhanced efficacy antiperspirant salts and particularly stabilized aqueous polyhydric alcohol solutions of such salts. One such method involves stabilizing an aqueous solution of an enhanced efficacy antiperspirant salt by adding an effective amount of a polyhydric alcohol having from 3 to 6 carbon atoms and from 3 to 6 hydroxyl groups. A second disclosed method involves preparing an enhanced efficacy aluminum antiperspirant salt by heating an aqueous solution of an aluminum antiperspirant salt in the presence of a polyhydric alcohol having from 3 to 6 carbon atoms and from 3 to 6 hydroxyl groups at a temperature of at least 50.degree. C. for a time sufficient to convert the salt to an enhanced salt. A third disclosed method is an improvement in the method of making an aluminum hydroxy halide or an aluminum hydroxy nitrate by reacting aluminum with an aqueous solution of aluminum halide or aluminum nitrate (or with aqueous hydrogen halide or nitric acid), wherein the improvement comprises including a polyhydric alcohol having from 3 to 6 carbon atoms and from 3 to 6 hydroxyl groups in the reaction mixture. Also disclosed are compositions produced by the foregoing methods.
A method of making an aqueous solution of an enhanced efficacy aluminum antiperspirant salt of the formula Al.sub.2 (OH).sub.6-a X.sub.a wherein X is Cl, Br, I or NO.sub.3 and a is about 0.3 to about 5, which method comprises reacting aluminum with an aqueous solution of AlX.sub.3 or HX, wherein the amount of aluminum, the amount of AlX.sub.3 or HX, and the time and temperature of reaction are selected so as to provide said antiperspirant salt of the formula Al.sub.2 (OH).sub.6-a X.sub.a at a concentration of about 5% to about 45% (USP) by weight, and wherein said aqueous solution of AlX.sub.3 or HX additionally comprises a polyhydric alcohol having from 3 to 6 carbon atoms and from 3 to 6 hydroxyl groups in an amount of about 5% to about 40% by weight of the reaction mixture.
In a method of making an enhanced efficacy antiperspirant salt of an aluminum hydroxy halide or an aluminum hydroxy nitrate which comprises reacting aluminum with an aqueous solution of aluminum halide or aluminum nitrate or with aqueous hydrogen halide or nitric acid, the improvement wherein said aqueous solution comprises a polyhydric alcohol having from 3 to 6 carbon atoms and from 3 to 6 hydroxyl groups.
Dependencies are inferred from the claim text.