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. 16, 1993
Filed:
Nov. 05, 1992
Applicant:
Inventors:
Ernst Wipfelder, Munich, DE;
Winfried Plundrich, Germering, DE;
Assignee:
Siemens Aktiengesellschaft, Munich, US;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ;
U.S. Cl.
CPC ...
523457 ; 523427 ; 523428 ; 523429 ; 523458 ; 525523 ; 525525 ; 525526 ; 525530 ; 525531 ; 525532 ; 525533 ; 528 89 ; 528 94 ; 528103 ; 528108 ; 528167 ; 528168 ; 528220 ; 528228 ; 528229 ; 528287 ; 528321 ; 528337 ; 528361 ; 528365 ; 528366 ; 528398 ;
Abstract
A halogen free casting resin suitable for covering electron devices with a fire retardant material contains an acidic ester of an hydroxy-functional phosphor compound and an organic anhydride. A stable mixture can be generated from the acidic ester and the hardener component of the casting resin, and further used for the hardening of epoxides resins. The acidic ester is chemically integrated in the epoxide resin matrix in a stable mixture, thereby improving the long term fire-retardancy of the casting resin molding compound without increasing the volatility of the mixture.