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:
Oct. 04, 1977
Filed:
Sep. 27, 1976
Kwok K Sun, Hamden, CT (US);
The Upjohn Company, Kalamazoo, MI (US);
Abstract
The use of certain dihydric phenols, alkyl ethers thereof, and alkyl-substituted monohydric phenols, as promoters in the acid catalyzed condensation of phenol and acetone to form Bisphenol-A enables said reaction to be carried out more rapidly, at significantly lower temperatures in some instances, with greater selectivity, i.e. reduction in proportion of undesired by-product, and most significantly, with the use of only catalytic amounts of mineral acid (instead of the large quantity in the conventional process) or the use of the inexpensive solid catalysts, such as acidic clays, which due to their low catalytic ability, are not useful as sole catalyst for this condensation if the promoter is not present. The promoters are readily recoverable for re-use.