Abstract: Aqueous compositions containing a water-soluble amphoteric surfactant are effectively thickened without substantial loss in clarity by a suitable pH responsive, synthetic addition copolymeric thickener such as a copolymer of an .alpha., .beta.-ethylenically unsaturated carboxylic acid (e.g., methacrylic acid), a nonionic chain extender of an .alpha., .beta.-ethylenically unsaturated monomer (e.g., ethyl acrylate), and a nonionic vinyl surfactant ester (e.g., nonylphenoxy(polyethyleneoxy)ethyl methacrylate). Due to the ability of the copolymeric thickener to increase the viscosity of the amphoteric surfactant composition without substantially reducing the clarity thereof, the resulting thickened compositions are useful as shampoos, cleaning compounds and the like.
Type:
Grant
Filed:
February 25, 1980
Date of Patent:
November 12, 1985
Assignee:
The Dow Chemical Company
Inventors:
John M. Kernstock, Earl H. Johnson, Bertha R. Vaughn
Abstract: In an isomeric mixture of ar-substituted-1-(sec-alkyl)benzenes, such as a mixture of 2-chlorocumene, 3-chlorocumene and 4-chlorocumene, the alkyl groups of the 3-isomer and 4-isomer react preferentially with a halogen in the presence of a catalyst such as benzoyl peroxide to form a 3-halo-1-(.alpha.-alkyl, .alpha.-halo)alkylbenzene and 4-halo-1-(.alpha.-alkyl, .alpha.-halo)alkylbenzene such as 3-chloro-.alpha.-bromocumene, and 4-chloro-.alpha.-bromocumene.