Abstract: An extrusion-coated metal article is prepared by applying a mixture which comprises an organosilane composition to a metal surface, and then extruding a melt of a polyamide molding composition onto the coated surface thus treated and dried.

Abstract: An extrusion-coated metal article is prepared by applying a mixture which comprises an organosilane composition to a metal surface, and then extruding a melt of a polyamide molding composition onto the coated surface thus treated and dried.

Abstract: A multilayer plastic pipe having strong bonding between the layers has at least one layer I of a polyolefin molding composition comprising a polyolefin, at least one layer II of a polyester molding composition, and at least one layer III of an adhesion promoter containing reactive groups and located between layers I and II. The polyester molding composition of layer II comprises a polyester and one or more compounds selected from a compound having two or more carbodiimide groups, carboxylic anhydride groups, maleimide groups or oxazine groups.

Abstract: A tire tread comprises a copolymer of butadiene with isoprene and/or styrene having a room temperature elasticity of between 5 and 35% at 22.degree. C., polybutadiene rubber and an aromatic oil selected from the group consisting of an aromatic oil, naphthenic oil, paraffinic oil, and a mixture thereof.

Abstract: Some rubbers exhibit poor wet skid behavior during ABS braking. The wet skid behavior is substantially improved by the blends, according to the invention, of integral rubber and natural rubber. The rolling resistance is not adversely affected.

Abstract: A multilayered lightweight building board, comprising a support core, two cover layers on the support core, where the support core is made of laterally fused-together tubes. The tubes have an inner layer, and an outer layer, where the outer layer has a softening point 10-90.degree. C. lower than the softening point of the inner layer. The lightweight building board is made from compatible thermoplastic materials, so they can be mechanically recycled by the customary processing methods for thermoplastics.

Abstract: A tire comprising a tire tread and a tire tread is disclosed wherein the tire tread is prepared from a tread rubber such as an AB block copolymer comprising from 40 to 80%-wt of block A obtained from butadiene having a uniformly distributed vinyl group content of from 8 to 60%-wt based on the total block A content, and from 20 to 60%-wt of block B derived from butadiene, isoprene and styrene; and a combination of naphthenic and/or paraffinic oil and a filler of carbon black, a mineral filler such as silica or a mixture thereof, or a blend of an aromatic oil and a mineral filler.

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

Abstract: 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.

Abstract: 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.

Abstract: 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%.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: An unsaturated elastomeric AB block copolymer, comprising:(i) 45-85 wt. % 1,3-butadiene,(ii) 5-40 wt. % isoprene, and(iii) up to 30 wt. % styrene,wherein said AB block copolymer comprising:40-80 wt. % of a block A, said block A comprising butadiene monomer units and having a content of uniformly distributed vinyl groups of 8-60 wt. %, and60-20 wt. % of a block B, said block B comprising 0-60 wt. % 1,3-butadiene, at least 10 wt. % isoprene and up to 45 wt. % styrene monomer units, wherein the butadiene and isoprene monomer units have a vinyl group content of 75-90 wt. %.

Abstract: 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 formulaR.sub.1 --O--CH.sub.2 --CH.sub.2 --O--R.sub.2in which R.sub.1 and R.sub.2 are alkyl groups having different numbers of C atoms, from the group consisting of methyl, ethyl, n- and isopropyl and n-, iso-, sec.- and tert.-butyl, has, in particular, the advantage that the "living polymers" formed during the anionic polymerization are not damaged.The production of tires and damping elements using these polyisoprenes.

Abstract: ABC block copolymers on the basis of butadiene, isoprene and optionally styrene, are provided by a polymerization process wherein the resultant block copolymer comprises:about 40 to 75 wt % of a block A based on butadiene (uniformly distributed vinyl group content less than about 15 wt %),up to about 25 wt % of a block B based on butadiene and isoprene (vinyl content less than about 15 wt %) or based on butadiene (vinyl content more than about 75 wt %)about 20 to 55 wt % of a block C based on butadiene and isoprene (vinyl content more than about 75 wt %). The ABC block copolymers are useful for the production of tire treads.