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:
Jun. 13, 1989
Filed:
Jun. 10, 1988
Klaus Bronstert, Carlsberg, DE;
Hans-Michael Walter, Ruppertsberg, DE;
Hans-Dieter Schwaben, Freisbach, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
Homo- or copolymers which have terminal mercapto groups, are composed of one or more monomers from the group consisting of butadiene, isoprene and styrene and are obtained by anionic polymerization of one or more of the stated monomers in the presence of one or more organolithium compounds followed by reaction (of the living anions) with an episulfide of the general formula I ##STR1## where R is hydrogen, alkyl of 1 to 18 carbon atoms or aryl of 6 to 10 carbon atoms, with the formation of one or more primary or secondary mercapto groups at the end of the polymer chain(s) are prepared by a process in which a thiolcarboxylic acid of the general formula II ##STR2## where R.sup.1 is hydrogen, alkyl of 1 to 10 carbon atoms or --CH.sub.2 --COOH and R.sup.2 is 0 or from 1 to 10 CH.sub.2 units, is added directly to the resulting reaction mixture in an amount of from 0.5 to 2 moles of the thiolcarboxylic acid per mole of episulfide, and the reaction product is subjected to an aftertreatment