Huels Aktiengesellschaft

Chemische Werke Huels Aktiengesellschaft

Huls Aktiengesellschaft

Christoph Herrmann

Walter Hellermann

Karl-Heinz Nordsiek

Hans-Bernd Fuchs

Jurgen Wolpers

Juergen Wolpers

Roland Streck

Wolfgang Kampf

Hans-Eberhard Von Portatius

Hans B Fuchs

An unsaturated, elastomeric, asymmetrically coupled block copolymer of the formula:

Unsaturated, elastomeric, asymmetrically coupled block copolymer, a

Rubber mixtures for tire treads are found, which show an improved wet skid resistance coupled with balanced abrasion and rolling resistance properties. This is achieved by rubber blend mixtures which contain 3,4-polyisoprene having a 3,4-content from 55 to 75%, a glass transition temperature from 0.degree. to -25.degree. C., a number average molecular weight of 200,000 and higher and an inhomogeneity U of less than 1.8. Motor vehicle tires can be prepared in an advantageous manner with these rubber mixtures.

3,4-polyisoprene-containing rubber blend mixtures for tire treads

Statistical AB-block copolymers having improved properties, a process for their manufacture and their use. Tire treads made of the statistical AB block copolymers according to the invention are characterized by high skid resistance under wet conditions combined with persistently low abrasion, good dynamic properties and rapid vulcanization.

Statistical AB-block copolymers having improved properties, process for

An unsaturated, elastomeric ABC block copolymer comprised of the monomer units of 40 to 80% of 1,3-butadiene, 5 to 40% of isoprene and 2 to 30% of styrene, said copolymer comprising i) 40 to 75% of block A which contains styrene and butadiene units or isoprene and butadiene units with a content of distributed vinyl or isopropenyl groups of less than 15%, iia) up to 25% of a block B which contains styrene and butadiene units or isoprene and butadiene units with a vinyl or isopropenyl content of more than 70%, or iib) up to 25% of a block B' which contains styrene, isoprene and optionally butadiene units with a content of homogeneously distributed isopropenyl or vinyl groups of less than 15%, and iii) 20 to 55% of a block C which contains styrene and isoprene units and optionally butadiene units with an isopropenyl or vinyl content of more than 70%.

ABC block copolymers based on butadiene, isoprene and styrene, process

An unsaturated elastomeric, asymmetrically coupled block copolymer of the formula: (A).sub.n -X-(B).sub.m, wherein block A is a block of polybutadiene having a content of uniformly distributed vinyl groups ranging from 8 to 60% and block (B) is a homopolymer of isoprene or a copolymer of at least 10% isoprene with 0 to 60% butadiene and up to 45% styrene, the copolymer having a vinyl unit content of 75 to 90%, X is a radical of a coupling agent and (m-n).gtoreq.0 and (m+n) ranges from 3 to 25.

Unsaturated, elastomeric, asymmetrically, coupled block copolymers, a

An unsaturated elastomeric AB block copolymer comprising 20-75 wt. % 1,3-butadiene monomer units; 5-50 wt. % isoprene monomer units; and 3-30% wt. % styrene monomer units; wherein said block copolymer contains less than 3 wt. % styrene blocks, each of said block A and block B contain all three of said monomer units, said copolymer comprises 30-90 wt. % of block A and 70-10 wt. % of block B, and wherein the average vinyl and isopropenyl content of block B are each at least 30% higher than those of block A; and a method for preparing the unsaturated AB block copolymer.

AB block copolymers based on butadiene, isoprene and styrene

A block-free polymer is prepared by anionically polymerizing at least two compounds selected from the groups consisting of butadiene, isoprene and styrene in an inert organic solvent in the presence of an organolithium compound as a catalyst and a cocatalyst of a glycol dialkyl ether: ##STR1## wherein R.sub.3 is hydrogen, methyl or ethyl, R.sub.1 and R.sub.2 are alkyl groups of different numbers of carbon atoms selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, iso-butyl, sec-butyl and t-butyl, and the total number of carbon atoms in the alkyl group ranges from 5 to 7.

Process for the preparation of polymers based on conjugated dienes and

An unsaturated elastomeric AB block copolymer, comprising:

AB block copolymers based on butadiene, isoprene and styrene, process

ABC block copolymers on the basis of butadiene, isoprene and optionally styrene, are provided by a polymerization process wherein the resultant block copolymer comprises:

ABC block copolymers based on butadiene and isoprene, process for their

A process for the production of low-molecular weight homo- and/or copolymers of 1,3-dienes carrying hydroxymethyl groups partially esterified with formic acid, comprises reacting homo- and/or copolymers of 1,3-dienes having an average molecular weight (Mn) of 500-8,000 with formaldehyde at temperatures of 150.degree.-300.degree. C. under a protective gas atmosphere and optionally in the presence of a solvent and a stabilizer.

Process for the production of low-molecular weight homo- and/or

A process for the isomerization of isolated double bonds to conjugated double bonds in low-molecular weight homo- and/or copolymers of 1,3-dienes uses an isomerization catalyst optionally in the presence of a solvent, wherein the isomerization catalyst is a mixture of

Process for the isomerization of isolated double bonds to conjugated

A process for the preparation of an extensively amorphous homo- or copolymer of an .alpha.-olefin of 3-32 carbon atoms comprises polymerizing an .alpha.-olefin using a titanium-containing Ziegler-Natta catalyst, the catalyst comprising a mixture of

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Marl, Germany

Christoph Herrmann