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. 26, 1990
Filed:
Mar. 02, 1989
Makoto Imanari, Ibaraki, JP;
Hiroshi Iwane, Ibaraki, JP;
Takahiro Sugawara, Ibaraki, JP;
Satoshi Ohtaka, Ibaraki, JP;
Naoki Suzuki, Ibaraki, JP;
Mitsubishi Petrochemical Company, Ltd., Tokyo, JP;
Abstract
A process for preparing 4,4'-dihydroxydiphenylmethane, which comprises reacting phenol with formaldehyde in the presence of an acidic catalyst and separating the aimed 4,4'-dihydroxydiphenylmethane from the crude dihydroxydiphenylmethane thus obtained, is disclosed. According to this process, 4,4'-dihydroxydiphenylmethane can be separated from its isomers and oligomers at a high purity and at a high yield, compared with those achieved by known methods. Thus highly useful 4,4'-dihydroxydiphenylmethane can be advantageously prepared on an industrial scale.