摘要:
Copolyalkenamers are produced by reacting a rubbery polybutadiene wherein more than 80 percent of the butadiene contact thereof is a 1,4-polymer, with a polyoctenamer or polydodecenamer or mixture thereof, in the presence of a mixed catalyst containing a compound of a metal of Subgroup 5 through 7 and a metal or a compound thereof of Main Group 1 through 4 of the Periodic Table.
摘要:
Vulcanizable rubber mixtures having improved room temperature hardness containing 2-20% by weight, calculated on the rubber, of a polyoctenamer or polydodecenamer.
摘要:
POLYISOPRENE HAVING THE HIGH RESISTANCE TO THERMAL AND MECHANICAL STRESSES OF NATURAL RUBBER IS PRODUCED BY INCORPORATION INTO A SOLUTION OF THE POLYISOPRENE A MIXTURE OF A DIFUNCTIONAL SECONDARY ARYLAMINE OF THE FORMULA
(4-(R2-NH-)PHENYL)-NH-R1
WHEREIN R1 AND R2 ARE ALKYL, CYCLOALKYL OR ARYL, AND AN ALIPHATIC AMINE OF THE FORMULA RN(NH)N-1(NH2)X WHEREIN X IS 1 OR 2, N IS 1-10 AND R IS ALKYL WHEN N AND X BOTH ARE 1 AND ALKYLENE WHEN N IS GREATER THAN 1.
摘要:
Discrete, finely divided, tack-free elastomer particles are prepared from a filler-containing aqueous elastomer emulsion containing an aqueous emulsion of an elastomer dissolved in a volatile inert organic solvent having an emulsifying amount of a quaternary ammonium salt cationic surfactant and an aqueous suspension or dispersion of a solid, finely divided elastomer filler, which process comprises gradually introducing the fillercontaining aqueous elastomer emulsion into an aqueous alkali silicate solution while maintaining said solution at a pH greater than 2 and simultaneously evaporating the organic solvent to form discrete, finely divided, tack-free elastomer particles. The process can be applied to solid elastomers or to post-polymerization elastomer solutions, and is particularly suitable for preparing pourable, carbon black containing elastomer particles to be formed into shaped objects.
摘要:
TIRE TREAD STRIPS FOR AUTOMOBILE TIRES HAVING A GOOD COMBINATION OF WEAR AND SKID RESISTANCE ARE FORMED OF A POLYBUTADIENE HOMOPOLYMER COMPOSITION CONSISTING ESSENTIALLY OF: (A) A HOMOPOLYMER OF 1,3-BUTADIENE HAVING AN AVERAGE VINYL GROUP CONTENT OF 25-50%, A CIS-1,4-DOUBLE BOND CONTENT OF 10-40%, A TRANS-1,4-DOUBLE BOND CONTENT OF 15-55%, A MOONEY VISCOSITY (ML-4) OF BETWEEN 40 AND 120, AND A DEFORMATION-ELASTICITY OF AT LEAST 25, WHOSE VINYL GROUPS ARE DISTRIBUTED ALONG THE LONGITUDINAL AXIS OF THE MACROMOLECULE TOWARD AN END THEREOF IN A SUBSTANTIALLY DECREASING MANNER, (B) 5-100 PARTS BY WEIGHT OF A PLASTICIZER, BASED ON 100 PARTS BY WEIGHT OF POLYBUTADIENE, AND (C) 30-120 PARTS BY WEIGHT OF A CARBON BLACK, BASED ON 100 PARTS BY WEIGHT OF POLYBUTADIENE.
摘要:
BLOCK HOMOPOLUMERS OF 1,3-BUTADIENE HAVING A FIRST BLOCK WITH NONUFORM VINYL GROUP DISTRIBUTION AND A FURTHER BLOCK HAVING A UNIFORM VINYL GROUP DISTRIBUTION IN A MOLE RATIO OF 20:80 TO 95:5 RESPECTIVELY AND AN AVERAGE VINYL GROUP CONTENT OF 15-75%, PREFERABLY 2050%, ARE PREPARED BY ADIABATIC SOLLVENT POLYMERIZATION AT AN ASCENDING TEMPERATURE IN THE PRESENCE OF A CATALYST SYSTEM COMPRISING AN ORGANOLITHIUM COMPOUND AND A LEWIS BASE. THE POLYMERS HAVE IMPROVED PROCESSING PROPERTIES.
摘要:
The molecular weight of solid hydrocarbon elastomers, e.g., polybutadienes, is increased step-wise in a defined manner by subjecting them to thermal-mechanical treatment in which the elastomer is subjected to strong shearing forces at, e.g., 80*220* C., in the presence of a non-basic metallic compound as catalyst and a basic compound as cocatalyst.