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:
Apr. 13, 2010
Filed:
Jul. 09, 2008
Hatem Abdallah Belfadhel, Roosendaal, NL;
Umesh Krishna Hasyagar, Karnataka, IN;
Gurram Kishan, Karnataka, IN;
Rathinam Jothi Mahalingam, Karnataka, IN;
Hatem Abdallah Belfadhel, Roosendaal, NL;
Umesh Krishna Hasyagar, Karnataka, IN;
Gurram Kishan, Karnataka, IN;
Rathinam Jothi Mahalingam, Karnataka, IN;
SABIC Innovative Plastics IP B.V., Bergen op Zoom, NL;
Abstract
A process for preparing 2,2-bis(4-hydroxyphenyl)propane (p,p-bisphenol-A) from 2,4,4-trimethyl-2-(4-hydroxyphenyl)chroman (chroman 1.5) is disclosed. Phenol and chroman 1.5 are contacted over an acidic ion exchange resin at a given temperature for a given period of time. The process results in improved quality of p,p-bisphenol-A, better performance of catalyst, improved raw material usage, and reduced waste.