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:
Jun. 06, 1978
Filed:
Apr. 23, 1976
George A Doorakian, Bedford, MA (US);
Lawrence G Duquette, Maynard, MA (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
The title compounds are prepared by reacting (a) a trihydrocarbylphosphine, (b) p-benzoquinone, and (c) a protic acid in a liquid reaction medium comprising a lower alkanol of from 1 to 4 carbon atoms, a 1,2-alkylene glycol, dialkylene glycol or trialkylene glycol or a lower alkyl mono-ether of said glycols. The glycols are either ethylene glycol, propylene glycol, or the indicated oligomers thereof. Methanol is the solvent of choice. As an example, tri-n-butyl (2,5-dihydroxyphenyl)phosphonium chloroacetate was prepared in excellent yields by slowly adding tri-n-butylphosphine, precooled to about 0.degree. C, to a vigorously stirred suspension of p-benzoquinone in a methanol solution of chloroacetic acid at a temperature of approximately -10.degree. C. A precatalyzed epoxy resin was obtained by merely adding the methanol solution of the phosphonium chloroacetate to a liquid epoxy resin (e.g., the diglycidyl ether of bisphenol-A).