Abstract: Tire treads having(a) low heat buildup under dynamic stress and a low frictional resistance to rolling,(b) adequate damping and accordingly a high wet skid resistance,(c) high abrasion resistance and accordingly high wearing efficiency, are produced from vulcanizable compositions based on an elastomer component containing an isoprene polymer characterized by a high content of recurring units obtained by 1,2- and 3,4-polymerization of isoprene.

Abstract: Vulcanizable polyalkenamer molding compositions comprising: (a) a polyoctenamer having an extensively cyclic structure with a trans-content of 50-70% and a reduced specific viscosity of 0.8-1.7 (dl./g.); and (b) conventional elastomer vulcanizing agents and additives have improved flow properties suitable for thermoplastic molding techniques together with mechanical properties in the vulcanizate comparable to SBR rubber.

Abstract: The instant invention relates to a method and apparatus for measuring the proportion of undissolved gas in a liquid component for the production of foam materials, particularly those based on polyurethanes. The method is based on the equation of state of ideal gases (Boyle-Mariot Law: p.multidot.v = constant) at constant temperatures. The gaseous portion of a liquid component charged with gas increases its volume under expansion according to the above equation. The gas expansion also increases the liquid volume. The differences in the volumes, of the liquid at two differing pressures is therefore a measurement of the quantity of gas present in the liquid. The apparatus consists of a closed graduated measurement vessel being connected to a variable pressure means capable of producing at least two different defined pressures.