Abstract:
Method for modifying polymers which contain -CH CH-groups by treating such polymers with a catalyst comprising a tungsten salt and an organo compound of a metal of groups I to IV of the Periodic Table.
Abstract:
SYNETHIC RUBBER MIXTURE COMPRISING: (A) FROM 10% TO 90% BY WEIGHT OF ONE OR MORE UNIFORM BUTADIENE/STRENE BLOCK COPOLYMERS WITH A MOLECULAR WEITHT OF FROM 30,000 TO 150,000 , A VISCOSITY (N) MEASURED IN TOUENE OF FROM 0.5 TO 2 DL./G. AND A STRYENE CONTENT OF FROM 20% TO 50% BY WEIGHT; AND (B) FROM 90% TO 10% BY WEIGHT OF ONE OR MORE UNIFORM BUTADINE/STYRENE BLOCK COPOLYMERS WITH A MOLECULAR WEIGHT OF FROM 100,000 TO 1,000,000, A VISCOSITY (N) MEASURED IN TOLUENE OF FROM 1.5 TO 10 DL./G. AND A STYRENE CONTENT OF FROM 0.3 TO 20% BY WEIGHT.
Abstract:
A process for isolating rubbers from their aqueous dispersions (latices), wherein a cellulose ether is added to an aqueous rubber dispersion in a quantity of 0.1 to 10 % by weight, based on the rubber, and a water-soluble alkali metal, alkaline earth metal, aluminium or zinc salt is added in a quantity of 0.02 to 10 % by weight, based on the rubber and the water is removed from this mixture.
Abstract:
A CATALYST MADE FROM (1) A RHENIUM COMPOUND AND (2) AN ALUMINUM ORGANIC COMPOUND POLYMERISES CYCLOPENTENE TO YIELD RUBBER-LIKE PRODUCTS WITH HIGH CONTENT OF CIS-LINKAGES.
Abstract:
A process for the production of cycloolefin polymers by the polymerization of cycloolefins in solution in inert organic solvents, using catalysts of tungsten salts and organic aluminum compounds, characterized in that an organic cycloolefin solution having a water content of 5 to 50 ppm, preferably 10 to 20 ppm, is used for the polymerization.