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. 31, 2011
Filed:
Dec. 12, 2006
Berthold Just, Hamburg, DE;
Holger Keller, Reppenstedt, DE;
Manfred Doering, Woerth-Buechelberg, DE;
Uwe Storzer, Karlsruhe, DE;
Sebastian Seibold, Stutensee, DE;
Berthold Just, Hamburg, DE;
Holger Keller, Reppenstedt, DE;
Manfred Doering, Woerth-Buechelberg, DE;
Uwe Storzer, Karlsruhe, DE;
Sebastian Seibold, Stutensee, DE;
Abstract
The invention relates to a method for preparing halogen-free flameproof epoxy resins, in which a halogen-free epoxy resin is reacted with a polyfunctional aldehyde or ketone and a phosphinic acid derivative, wherein the phosphinic acid derivative contains at least one P—H-active structural unit of the formula ═PH(O) and is used in an amount equivalent to the polyfunctionality of the aldehyde or ketone, to a halogen-free flameproof epoxy resin obtainable by this method, to the use of the epoxy resin as a base material for the manufacture of printed circuit boards and printed circuits and to intermediates used to prepare the epoxy resins.