Basf Aktiengesellschaft

Dietmar Bender

Klaus Bronstert

Konrad Knoll

Helmut Mach

Martin Fischer

Rainer Becker

Norbert Niessner

Hermann Gausepohl

Daniel Wagner

Paul Naegele

Uwe Blumenstein

Hans-Michael Walter

Helmut Jenne

Gregor Schuermann

Thermoplastic elastomer

Polymers Ia and Ib carrying functional groups and obtainable by

Polymers based on conjugated dienes

Hydrocarbons and polymers thereof, of the structure (I)

Polyisobutylene hydrocarbon or polymer containing a double bond allylic

The novel alkadiene/vinyl-aromatic copolymers which contain side groups and have a random, block-like or star-like structure and whose polymerized alkadiene comonomer units are partially or completely selectively hydrogenated, and which contain one or more side groups having one or more radicals capable of (4+2) cycloaddition (Diels-Alder reaction) with dienophiles are suitable as such as viscosity index (VI) improvers or can be used for the preparation of dispersant VI improvers. For this purpose, they are reacted with one or more dienophiles which are capable of a Diels-Alder (4+2) cycloaddition reaction and preferably contain strongly polar functional groups. The resulting selectively hydrogenated alkadiene/vinylaromatic copolymers having one or more side groups which constitute a (4+2) cycloadduct or a Diels-Alder adduct can be modified in their performance characteristics by further reaction with ammonia, an organic amine, an alkylene oxide, a polyalkylene oxide and/or a condensate of ammonia and/or an organic amine with an alkylene oxide.

Alkadiene/vinylaromatic copolymers containing side groups, and their use

Multilayer, sealable plastics films essentially consist of

Sealable, peelable plastics film

A copolymer with stellate branching, of the general formula [A-].sub.k X, where A is the monovalent radical of a homopolymer, block copolymer or random copolymer of a conjugated diene and/or vinyl-aromatic hydrocarbon, k is a number from 1 to 10, and X is the k-valent radical of a coupling center produced by coupling with hexatriene, and the product of the hydrogenation thereof are described.

Branched copolymers

Preparation of hydrocarbons and polymers with allylic chloride end

Polymers having terminal halogen atoms and consisting of cationically polymerizable, olefinically unsaturated monomers are obtainable by polymerization using an initiator system comprising a halogen-containing Lewis acid and a 3-membered to 8-membered cyclic ether.

Polymers having terminal halogen atoms

A process for the preparation of polymers of isobutene having tertiary chloride groups by reaction of appropriate polymers which have been prepared by cationic polymerization of isobutene with hydrogen chloride.

Preparation of polymers having tertiary chloride end groups

Stilbene compounds of the general formula Ia, Ib or Ic

Stilbene compounds use in anionic polymerization

A method of isolating trans-1,1,4,4-tetraalkyl-2-butene-1,4-diols of formula I ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same or different and denote C.sub.1 - to C.sub.5 -alkyl, from mixtures thereof with their cis-isomers, wherein the trans-isomer is separated from the cis-isomer by liquid-liquid extraction.

Method of isolating trans-1,1,4,4-tetraalkyl-2-butene-1,4-diols

A modified polyisobutene has the general formula I ##STR1## where R.sup.1 is an olefinically unsaturated divalent radical, R.sup.2 is one of the radicals --CH.sub.2 --C(.dbd.CH.sub.2)--CH.sub.2 -- or --CH.sub.2 --C(CH.sub.3).dbd.CH-- or m and n are each a degree of polymerization in particular from 1 to 1000.

Growing community of inventors

Schifferstadt, Germany

Dietmar Bender