Stable hair relaxer
Patent 4390033 Issued on June 28, 1983. Estimated Expiration Date: 
August 25, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 25, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesProcess for improving the quality of living, human hair by lanthionization Hair conditioning waving and straightening compositions and methods Stable hair relaxer Hair straightening process and hair curling process and compositions therefor Patent #: 4304244 InventorsAssigneeApplicationNo. 06/294911 filed on 08/25/1981US Classes:132/202, Hair treatment by application of specific chemical composition424/70.2Permanent waving or straighteningExaminersPrimary: Ore, Dale R.Attorney, Agent or FirmInternational ClassesA61K 8/41 (20060101)A61K 8/43 (20060101) A61K 8/26 (20060101) A61K 8/19 (20060101) A61K 8/30 (20060101) A61Q 5/04 (20060101) AbstractAn emulsified composition is disclosed which is stable on aging and convertible to a hair relaxer composition by admixture with an aqueous solution of guanidine carbonate. The relaxer composition is comprised of a continuous water phase having dispersed therein about 3 to about 50 weight percent oleaginous material, about 7 to about 25 weight percent emulsifier and about 2 to about 30 weight percent of a lipophilic organically modified hectorite clay gellant. These compositions may be prepared by mixing and heating the oleaginous material, lipophilic hectorite gellant and less water soluble emulsifiers to about 80° C. to form the oil phase which contains no more than about 65 weight percent of the composition. Water, calcium hydroxide and emulsifiers of high water solubility are mixed and heated to form the bulk of the aqueous phase, and then added to the oil phase. After continued agitation and maintenance of about 80° C., the composition is cooled to about 50° C. and perfume is added. The mixture is mixed further, force cooled to about 25° C. and homogenized.Other References
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