57results about How to "Good rubber performance" patented technology

There is provided a ring-opening polymer of cyclopentene wherein a cis ratio of cyclopentene-derived structural units is 30% or more, the weight average molecular weight (Mw) is 100,000 to 1,000,000, and an oxysilyl group is included at an end of the polymer chain. For example, the ring-opening polymer of cyclopentene can be obtained by ring opening polymerization of cyclopentene in the presence of a compound of a transition metal belonging to Group 6 in the Periodic Table, an organoaluminum compound represented by the following general formula (1), and an olefinically unsaturated hydrocarbon containing an oxysilyl group.(R1)3-xAl(OR2)x  (1)(in the general formula (1), R1 and R2 represent a hydrocarbon group having 1 to 20 carbon atoms and x satisfies the requirement 0<x<3.)

High viscosity elastomers are often difficult to utilize in rubber compositions without first creating a pre-blend of the high viscosity elastomer and a rubber processing oil to reduce their overall viscosity. This invention relates to utilization of a specialized pre-blend of high viscosity and low viscosity elastomers for use in rubber compositions and to the resulting rubber composition. The use of such resulting rubber composition may be for component(s) of tires, particularly including tire treads. The specialized pre-blend of high and low viscosity elastomers is required to be created by blending individual latices or, alternatively, by blending individual polymerizates of elastomers with diverse viscosities.

The invention provides a sealing material for caps, e.g., metal caps for food containers, which is reduced in swelling with substances dissolved out or alcoholic beverages and in adsorption of the odor thereof and which comprises a tough and nonyellowing polyurethane elastomer and has satisfactory sealing performance. and to provide a manufacturing method for the lid using the sealing material. The sealing material is made of the polyurethane elastomer that is given by reacting the following elements (A), (B), (C), where (A) is a polyisocyanate element which is given by modifying an aliphatic isocyanate and / or an alicyclic isocyanate, contains isocyanate groups of 5 to 38 mass%, and shows an average functional group number of 2 to 3, (B) is a polyol element which has a hydroxyl group value of 20 to 350 (mgKOH / g) and shows an average functional group number of 2 to 3, and (C) is a fatty acid glycerol ester having hydroxyl groups.

A method is provided for preparing a reprocessed rubber from thermoset rubber particles. The method includes providing a plurality of thermoset rubber particles, inducing dynamic swelling and dynamic compatibilization of the plurality of rubber particles, admixing at least one de-linking agent with the swelled and wetted rubber particles, and wherein the step of admixing the at least one de-linking agent is carried out under thermo-mechanical mixing.

The renewed rubber of this invention can be used in rubber formulations that are used in manufacturing a wide array of rubber products, including tires, power transmission belts, conveyor belts, hoses, and a wide array of other products. The present invention more specifically discloses a method for manufacturing an environmentally friendly, chemically functionalized, renewed rubber composition having a highly desirable combination of physical properties and which exhibits excellent processability comprising the steps of (1) blending a micronized rubber powder with a processing aid and a chemical functionalizing agent to produce a blended mixture; (2) processing the blended mixture under conditions of high shear and low temperature to produce a reacted mixture; (3) adding a stabilizer to the reacted mixture to produce the chemically functionalized renewed rubber composition.