Huels Aktiengesellschaft

Huls Aktiengesellschaft

Jurgen Wolpers

Karl-Heinz Nordsiek

Walter Hellermann

Christoph Herrmann

Hans-Bernd Fuchs

Dieter Zerpner

Hans-Eberhard Von Portatius

Hans B Fuchs

Johannes Tornau

Vulcanization of diene rubbers at a temperature of from 140.degree. to 200.degree. C. in the presence of 1 to 4.5 parts of a crosslinker having the formula ##STR1## wherein n denotes 2 or 6 and Bz denotes benzyl, in the simultaneous presence of a very small amount of sulfur and a small amount of a mercapto or sulfenamide accelerator or mixtures thereof affords elastomers having a previously unachieved outstanding ageing stability and reversion stability, after relatively short vulcanization times using economical amounts of chemicals while avoiding blooming phenomena in the vulcanizate.

Process for the preparation of diene rubber vulcanizates

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, 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

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

Polyisoprenes having a high content of 1,2- and 3,4-structural units, a process for their preparation, and their use. The previous processes for the preparation of polyisoprene having a high content of 1,2- and 3,4-structural units were still unsatisfactory in terms of the cocatalyst employed. The use of ethylene glycol dialkyl ethers of the formula

Preparation of polyisoprene having high content of 1,2- and

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

The invention relates to hot-vulcanizable tread strips which are produced from novel vulcanizable compositions and from which the treads of pneumatic motor tires can be produced. The vulcanizable compositions are based on a rubber component which includes a special, novel rubber component based on isoprene. The inventive tire treads have an excellent combination of useful properties which can be described by the following set of characteristics:

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Haltern, Germany

Jurgen Wolpers