The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 02, 1976
Filed:
Nov. 10, 1975
Jerry A Broussard, Corpus Christi, TX (US);
Gene J Fisher, Corpus Christi, TX (US);
Celanese Corporation, New York, NY (US);
Abstract
Monomeric esters of polyalkylene glycols and .alpha., .beta.-unsaturated carboxylic acids are prepared, using a polyalkylene glycol or mono-ether derivative of an alkylene glycol or polyalkylene glycol which has a tendency to form peroxides, by heating a mixture of the glycol or derivative, a hydrocarbon solvent, and a small amount of a dilute caustic or sodium borohydride for a time and to a temperature sufficient to decompose the peroxide, and then reacting the glycol or derivative with an unsaturated acid such as acrylic acid or methacrylic acid in an inert atmosphere and in the presence of a suitable esterification catalyst and polymerization inhibitor. The crude reaction product is purified by extraction with an aqueous base, such as sodium carbonate, to remove acidic impurities and is thereafter treated with fuller's earth and decolorizing charcoal to remove any color bodies still present. The decolorizing agents are then removed by filtration.