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:
Dec. 14, 1999
Filed:
May. 30, 1997
Applicant:
Inventors:
Kuen Yuan Hwang, Hsinchu, TW;
Hong-Hsing Chen, Hsinchu, TW;
An Bang Duh, Hsinchu, TW;
Chie-Yih Ju, Hsinchu, TW;
Assignee:
Chang Chun Plastics Co., Ltd., Taipei, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ;
U.S. Cl.
CPC ...
514517 ; 549514 ; 528 95 ; 528409 ; 528413 ; 525507 ;
Abstract
This invention relates to a process for preparing a high purity epoxy resin comprising reacting an aromatic compound containing hyroxyl or amino group with an excess amount of an epihalohydrin in the presence of hydroxides of alkali metal or alkali earth metal in one or more low-boiling aprotic cosolvents under normal or reduced pressure with dewatering to obtain a high purity epoxy resin with low level of hydrolyzable halides.