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:
May. 04, 1999
Filed:
Mar. 06, 1997
Applicant:
Inventors:
Assignee:
Aventis Research & Technologies GmbH, Frankfurt am Main, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ; C08G / ;
U.S. Cl.
CPC ...
525507 ; 525523 ; 525525 ; 528 89 ; 528108 ; 528398 ; 528400 ;
Abstract
The present invention relates to a storage-stable, phosphorus-modified epoxy resin having an epoxide value of 0.05 to 0.6 mol/100 g and comprising 5 to 25% by weight of an ester-anhydride formed from a phosphonic acid diester, phosphinic acid ester or mixture of these esters and phosphorus pentoxide, and to a process for its preparation by reaction of 95 to 75 parts by weight of an epoxy resin (A) having an epoxide value of 0.1 to 0.8 mol/100 g and 5 to 25 parts by weight of the ester-anhydride in the presence or absence of a solvent at -20 to 150.degree. C.