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:
Mar. 10, 1992
Filed:
Jul. 13, 1990
Johnny Chavez, Jr, Lake Jackson, TX (US);
Raymond A Plepys, Lake Jackson, TX (US);
Craig A McClure, Houston, TX (US);
Van A Kent, Lake Jackson, TX (US);
Richard N Gerstle, Lake Jackson, TX (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
A process for reducing the amount of propenyl polyethers in hydroxy-functional polyethers comprising (1) contacting a neutral hydroxy-functional polyether, containing a propenyl polyether and water, and an acid catalyst soluble in the hydroxy-functional polyether under reaction conditions sufficient to convert at least a portion of the propenyl polyether to propionaldehyde; (2) contacting the product of step (1) and an epoxy compound to substantially scavenge the acid catalyst; and (3) stripping the product of step (2) to substantially remove the epoxy compound the the propionaldehyde. The resulting hydroxy-functional polyethers contain reduced amounts of propenyl polyethers and can therefore be used to prepare polyurethane foams having a reduced tendency to discoloration.