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:
Nov. 11, 1997
Filed:
Nov. 14, 1995
Applicant:
Inventors:
Chun-Shan Wang, Tainan, TW;
Tsung-Han Ho, Kao Hsiung, TW;
Assignee:
National Science Council, Taipei, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; C08L / ;
U.S. Cl.
CPC ...
525528 ; 525407 ; 525438 ; 525452 ; 525453 ; 525476 ; 525504 ; 528 65 ; 528 66 ; 528 73 ; 528 76 ; 528 84 ; 528 85 ; 528 93 ;
Abstract
A modified epoxy resin is prepared by mixing an isocyanate terminated urethane prepolymer with an epoxy resin in reactive conditions. The modified epoxy resin has a low internal stress when it is cured due to the flexible backbone of the urethane prepolymer incorporated therein, and has a high glass transition temperature due to a rigid oxazolidone structure formed via the epoxy ring opening with the isocyanate groups, and thus is useful as an electronic encapsulant.