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. 08, 1993
Filed:
Oct. 04, 1990
Applicant:
Inventors:
Akira Yasuda, Saitama, JP;
Rihei Nagase, Tokyo, JP;
Assignee:
Somar Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ; C08L / ;
U.S. Cl.
CPC ...
523210 ; 523211 ; 523435 ; 524450 ; 25218213 ; 25218214 ; 25218223 ; 25218228 ;
Abstract
Disclosed is a hardening agent composition for epoxy resins in the form of powdery grains, comprising a low-reactive hardening agent, a hardening promoter, a zeolite and at least one additive selected from a water-repellent fine silica powder, a silane coupling agent and a polysiloxane compound, whereby the additive is adhered to the surfaces of the powdery grains. The composition has a retarded water-absorbing property and has improved storage stability, when blended with an epoxy resin to form a thermosetting epoxy resin composition. Methods for preparing the powdery hardening agent composition are also disclosed.