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. 24, 2001
Filed:
Nov. 23, 1999
Applicant:
Inventors:
Assignee:
Sumitomo Chemical Company, Limited, Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ;
U.S. Cl.
CPC ...
C07D / ; C07D / ;
Abstract
The method for producing an epoxy resin involving the steps of: reacting at least one phenol compound with at least one aldehyde compound to obtain a novolak resin; storing the novolak resin in a molten state in an inert gas atmosphere; feeding the stored novolak resin into an epoxidation reactor; and reacting the stored novolak resin with an epihalohydrin compound, which prevents generation of dust improving the working environment, increases production efficiency reducing production cost, and further suppresses quality degradation such as coloring of the epoxy resin.