Abstract:
Composite material comprising - one or more heat-activatable free-radical initiators selected from the group consisting of organic peroxides and/or initiators having labile carbon-carbon bonds and particles which have a core-shell structure and the core of which comprises one or more magnetic materials, while the shell comprises silicon dioxide.
Abstract:
The present invention relates to polymer microgel beads having a polymeric matrix with nanomagnetic particles dispersed substantially uniformly therethrough, wherein a steric stabiliser is associated with the particles, the steric stabiliser being a polymeric material that (i) does not form part of the polymeric matrix of the beads, and (ii) comprises a steric stabilising polymeric segment and an anchoring polymeric segment, wherein the steric stabilising polymeric segment is different from the anchoring polymeric segment, and wherein the anchoring polymeric segment has an affinity toward the surface of the nanomagnetic particles and secures the stabiliser to the particles.
Abstract:
The present invention is directed to a pneumatic tire comprising one or more indicia formed from an elastomeric coating composition comprising a diene based elastomer and from 1 to 100 parts by weight, per 100 parts by weight of elastomer, of a nanoparticle comprising an inner core of an inorganic magnetic material at least partially covered by an outer layer of silica.
Abstract:
Rubber compound containing at least one nanoscale, magnetic filler and at least one non-magnetic filler. Vulcanizable mixture containing the rubber compound and at least one crosslinking agent and/or vulcanization accelerator. Molding obtainable from the vulcanizable mixture by heat treatment or action of an electrical, magnetic or electromagnetic alternating field.
Abstract:
The present invention relates to a rubber compound comprising at least one hydrogenated carboxylated nitrile rubber, at least one hydrogenated nitrile rubber and at least one magnetic compound, a curable rubber compound comprising said rubber compound and at least one vulcanization agent and a magnetic shaped article comprising said rubber compound.
Abstract:
A composition useful for magnetic filled tires, particularly for tire sidewalls, which contains an organoxysilylsulfane coupling agent, is provided. The composition displays either improved fatigue resistance or either improved crack growth resistance or both. The sidewall composition is magnetizable to a magnetic field strength of preferably at least 0.1 Gauss, more preferably at least 0.5 Gauss, even more preferably at least 1 Gauss, even more preferably at least 10 Gauss, most preferably at least 25 Gauss, as measured at a distance of 8 mm for a 1 mm thick layer. The sidewall composition comprises 100 parts rubber, magnetic particulate, organosilane and curing agents. The compositions contain: curing agents in an amount effective to cure the rubber; such as sulfur preferably from 30 to 350 phr, more preferably from 40 to 300 phr, most preferably from 50 to 250 phr magnetic particulate; and preferably from 0.5 phr to 30 phr, more preferably from 1 to phr to 20 phr, most preferably from 2 to 10 phr organoxysilylsulfane. The present invention also relates to methods of making tires, and to the tire itself.
Abstract:
Diese Erfindung liefert eine Gummimischung, die mit einem ungewöhnlich hohen Anteil an festen magnetisierbaren Partikeln wie z.B. Eisenoxid oder Strontiumferrit gefüllt ist, aber dennoch kaum anfällig ist für die Entstehung und auch die Ausbreitung von Rissen. Das ermöglicht die Erzeugung stark magnetisierter Bereiche in Gummiartikeln, die aus einer Gummimischung nach dieser Erfindung hergestellt sind. Eine so starke Magnetisierung liefert - auch bei Anwendungen, bei denen aufgrund von Deformation eine große Distanz zwischen einer Reihe von magnetisierten Bereichen und einem Sensor notwendig ist - auch dann noch gut reproduzier- und erkennbare Signale, wo verfälschende Magnetfelder existieren. Die magnetisierbaren Partikel werden mit Hilfe eines Haftvermittlers, nämlich eines Organosilan-Polysulfids, an die Gummimatrix gebunden.