5310 results about "Diene" patented technology

This invention relates to a rubber composition which contains intercalated and at least partially exfoliated organophillic clay reinforcement formed in situ within the elastomer host from a hydrophilic clay. The invention particularly relates to an in situ modification of a hydrophilic clay to compatibilize the clay with a diene-based elastomer. The clay is converted from being hydrophilic in nature to being more hydrophobic in nature and therefore more compatible with the elastomer by bulk blending the elastomer host with a smectite clay, preferably a montmorillonite or hectorite clay, and a hydrocarbyl onium salt, such as for example a quaternary ammonium salt, and particularly in the absence of water addition to the elastomer host. Therefore, such in situ procedure of intercalation and at least partially exfoliation relies upon a bulk blending thereof with an elastomer host at an elevated temperature and under high shear conditions in contrast to pre-intercalating the clay in an aqueous based medium and in contrast to simple low viscosity melt processing of a thermoplastic polymer. The invention also relates to articles of manufacture, including tires, having at least one component comprised of such rubber composition. Such tire component may be, for example, a tire tread.

Diene rubber compositions are described containing a diene elastomer, a reinforcing inorganic filler, and a coupling agent wherein the inorganic filler includes a silica having the following characteristics:(a) a BET specific surface area between 45 and 400 m2 / g;(b) a CTAB specific surface area between 40 and 380 m2 / g;(c) an average particle size (by mass), dw, of 20 to 300 nm;and at least one of the following characteristics, preferably two and more preferably all three:(d) a particle size distribution such that dw≧ / CTAB)−30;(e) a porosity which meets the criterion L / FI≧−0.0025 CTAB+0.85;(f) an amount of silanols per unit of surface area, NSiOH / nm2; NSiOH / nm2≦−0.027 CTAB+10.5.These diene rubber compositions can be used for the manufacture of tires or of semi-finished products intended for tires.

Particular embodiments of the present invention are directed to articles comprising polymers comprising one or more C3-40 olefins, optionally one or more dienes, and less than 5 mole percent ethylene, which dot T-peel The force is 1 Newton or higher, the branching index (g') measured at the Mz of the polymer is 0.95 or lower, and the Mw is 100,000 or lower. The present invention also relates to a method for producing an olefin polymer, comprising: 1) selecting a first catalyst component capable of producing a polymer having a Mw of 100,000 or less and a crystallinity of 20% or less; 2) selecting the a second catalyst component that produces a polymer having a Mw of 100,000 or less and a crystallinity of 40% or more; and 3) combining said catalyst component with one or more activators in the presence of one or more activators C3-40 olefins are contacted in the reaction zone.

Process for the production of gasoline with a low sulfur content that comprises at least the following two stages:a) a hydrogenation stage of the unsaturated sulfur containing compounds,b) a decomposition stage of saturated sulfur containing compounds,and optionally a preliminary stage for pretreatment of the feedstock such as selective hydrogenation of dienes.

This invention relates to a pneumatic tire with puncture sealing property and a method for preparing such tire. Such tire is prepared by building an uncured butyl rubber-based layer, which contains a peroxide and a dispersion therein of a particulate precured rubber selected from pre resin-cured butyl rubber and / or pre sulfur-cured diene-based elastomer, into an uncured tire and between an innerliner layer and the tire carcass. Upon curing the prepared tire under conditions of elevated temperature, a major portion of the uncured butyl rubber composition is depolymerized to form a tacky material, which contains said dispersion therein of said particulate precured rubber, which has puncture sealant properties. Such layer of depolymerized butyl rubber and dispersed precured rubber particles may be collectively referred to as the sealant layer.