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. 20, 1984
Filed:
Feb. 28, 1983
Applicant:
Inventors:
George A Doorakian, Bedford, MA (US);
Marsha A Paul, Natick, MA (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ;
U.S. Cl.
CPC ...
528 89 ; 528104 ; 528 99 ; 528109 ;
Abstract
An improved process for reacting vicinal epoxides with phenols or thiophenols is described. This process is conducted at essentially anhydrous conditions and temperatures less than 175.degree. C. The resulting resins are generally more linear and less colored than advanced resins produced via prior art processes. Also the phosphonium catalyst remains active to promote subsequent advancement or curing reactions. The catalyst can be deactivated in a separate step to produce a resin of exceptional purity.