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:
Sep. 21, 1993
Filed:
Jul. 17, 1992
Horst Roeschert, Ober-Hilbersheim, DE;
Ralph Dammel, Coventry, RI (US);
Georg Pawlowski, Wiesbaden, DE;
Klaus-Juergen Przybilla, Frankfurt am Main, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
A process is described for preparing N-tert-butoxycarbonylmaleimide from maleimide and di-tert-butyl dicarbonate which comprises reacting maleimide with di-tert-butyl dicarbonate in the presence of a basic compound of the general formula I ##STR1## in which A represents the ring members required to complete a five- or six-membered saturated ring and R is (C.sub.1 -C.sub.4)alkyl, in one stage to give the end product. In a preferred embodiment, the compound of the general formula I is N-methylmorpholine. The product is useful as a monomer for polymerization, with the styrene copolymers being particularly suitable for chemically reinforced radiation-sensitive mixtures.