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:
Dec. 15, 1992
Filed:
Jun. 13, 1990
Klaus Bronstert, Carlsberg, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
An organic compound of an alkali metal, of the formula I ##STR1## which is obtained by reaction of an appropriate diarylethylene of the formula II with an alkali metal (M), especially lithium, ##STR2## where Ar.sup.1 and Ar.sup.2 are identical or different aryl or hetaryl radicals which have one or more rings which are either separate or fused, and where R is at least one substituent different from hydrogen and which is chemically inert to the alkali metal or its alkyl, with the proviso that the total of the carbon atoms in all the R is at least 3, and m and n are each an integer up to 4, is used for the preparation of polymers whose monomers are amenable to anionic polymerization.