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:
Feb. 01, 2011
Filed:
Apr. 29, 2008
Keki Hormusji Gharda, Mumbai, IN;
Ashokkumar M. Malte, Thane, IN;
Suchet S. Mathur, Dombivli, IN;
Pulinattu C. Joseph, Thane, IN;
Mathew Abraham, Navi Mumbai, IN;
Janardan K. Nambodari, Dombivli, IN;
Sanjay C. Limaye, Kalyan, IN;
Shekhar V. Sathe, Dombivli, IN;
Kailas Ambadas Chavan, Dombivli, IN;
Deepak R. Naladkar, Badlapur, IN;
Keki Hormusji Gharda, Mumbai, IN;
Ashokkumar M. Malte, Thane, IN;
Suchet S. Mathur, Dombivli, IN;
Pulinattu C. Joseph, Thane, IN;
Mathew Abraham, Navi Mumbai, IN;
Janardan K. Nambodari, Dombivli, IN;
Sanjay C. Limaye, Kalyan, IN;
Shekhar V. Sathe, Dombivli, IN;
Kailas Ambadas Chavan, Dombivli, IN;
Deepak R. Naladkar, Badlapur, IN;
Gharda Chemicals Limited, Maharashtra, IN;
Abstract
A process for the preparation of an alkali metal salt of 4-chloro-4'-hydroxy benzophenone including the steps of (a) preparing purified 4-chloro-4′-hydroxy benzophenone by a process including distilling under reduced pressure a liquid containing 4-chloro-4′-hydroxy benzophenone and a solvent selected from diphenyl sulphone, diphenylene sulphone, benzophenone and dichlorobenzophenone, and then (b) preparing the alkali metal salt of thus purified 4-chloro-4′-hydroxy benzophenone by the reaction of the purified 4-chloro-4′-hydroxy benzophenone with a stoichiometric excess of at least one alkali metal base. There is also described a polymerization process using the alkali metal salt to yield PEK with high inherent viscosity and improved mechanical and thermal properties.