This magnesium oxide powder contains secondary particles in which a plurality of primary particles of magnesium oxide having a crystal phase and a grain boundary phase are at least partially fused together by the grain boundary phase, and a median diameter obtained by a laser diffraction scattering method is 300 .Math.m or less.

Processes for producing ammonium octamolybdate/metal hydroxide complexes include the steps of pre-contacting ammonium dimolybdate and a metal hydroxide, and then contacting molybdenum trioxide, to form the ammonium octamolybdate/metal hydroxide complexes. The resulting complexes contain the metal hydroxide and from 1 to 95 wt. % of ammonium octamolybdate, and generally, at least 80 wt. % of the ammonium octamolybdate in the complex is present in an orthorhombic crystalline form. These ammonium octamolybdate/metal hydroxide complexes can be used as smoke suppressants in polymer compositions, such as PVC-based and epoxy-based formulations.

A method for manufacturing a tire rubber composition includes kneading a rubber component, a silane coupling agent and a silica having a BET specific surface area of 210 m.sup.2/g or more, adding a vulcanization accelerator to a first kneaded material including the rubber component, silane coupling agent and silica, kneading a first resulting mixture including the rubber component, silane coupling agent, silica and vulcanization accelerator such that a second kneaded material including the rubber component, silane coupling agent, silica and vulcanization accelerator is obtained, adding a vulcanization agent to the second kneaded material including the rubber component, silane coupling agent, silica and vulcanization accelerator, and kneading a second resulting mixture including the rubber component, silane coupling agent, silica, vulcanization accelerator and vulcanization agent. The first kneaded material has a pH of 6.5 or less, and the second kneaded material has a pH of 8.0 or more.

A tire composition is disclosed. The composition comprises a rubber component and based on 100 parts by weight (phr) of the rubber component, 50-200 phr of covered silica, with the covered silica comprising silica core and a first resin covering the silica core, wherein the first resin is not chemically bonded to the silica core. The silica core is covered with the first resin by mixing a slurry comprising silica core with a mixture containing the first resin as a solution, an aqueous dispersion; or a solution by dissolving the first resin in a solvent.

Provided is a silicone rubber composition suited for use as a key pad having excellent dynamic fatigue durability (keying durability) and a silicone rubber key pad obtained by curing molding of the composition.

A silicone rubber composition for making a key pad includes: (A) 100 parts by weight of an organopolysiloxane represented by the following average compositional formula (1):

R.sup.1.sub.nSiO.sub.(4-n)/2  (1)

wherein R.sup.1 is each independently the same or different and are an unsubstituted or substituted monovalent hydrocarbon group, and letter n is a positive number of 1.95 to 2.04, and having at least two alkenyl groups in one molecule; (B) 10 to 100 parts by weight of reinforcing silica having a specific surface area of at least 50 m.sup.2/g when determined by BET method; (C) 0.1 to 10 parts by weight of a vinyl group-containing alkoxysilane; (D) 0.0001 to 0.2 part by weight of hydrochloric acid, calculated as hydrogen chloride in hydrochloric acid; (E) 0.01 to 5 parts by weight of a fatty acid ester and/or a fatty alcohol ester; and (F) an effective amount of a curing agent.

The invention is directed to a polymer composition having reduced odor emission. The polymer composition comprises a plurality of functionalized silicate particles dispersed in a polymer component. The invention further describes a process for preparing the polymer composition involving either a compounding process or a masterbatch process. In addition, the invention further describes an automobile component comprising the polymer composition of the present invention or articles, which are prepared by injection molding or extrusion of the polymer composition of the present invention.

The present disclosure provides a polymer blend that includes at least two polymers which are immiscible to one another and a carbon nanotube pulp comprising entangled carbon nanotubes as a compatibilizing agent and to a method of preparing the same.

Provided are magnesium oxide particles which are good in dispersibility in a resin or rubber, can function sufficiently as an acid acceptor or scorch retarder, and do not lower, even after combined with a resin or rubber, material properties thereof; a resin composition; a rubber composition; and a shaped body. The magnesium oxide particles satisfying the following (A) to (C): (A) an average particle size is 5 μm or less; (B) a BET specific surface area is 20 m.sup.2/g or more and 200 m.sup.2/g or less; and (C) a screen residue by a sieve opening of 45 μm is 0.1% by weight or less.

A process for producing hydrophobic and reactive, inorganic and/or organic fillers, including the steps of: (a) providing a filler having a defined surface area, (b) mixing the filler with the solution of at least one hydrophobizing and activating, biologically based reactive compound in a mixing assembly in an amount of 0.15×10-2 to 5.0×10-2 g per m2 filler surface area at a speed of 20 rpm to 200 rpm for 12 minutes to 120 minutes, (c) evacuating the hydrophobized and activated, inorganic and/or organic filler in a storage bag, a box or a drum, or directly in the casting compound.

Described herein are conductive rubber compositions including a rubber component and one or more electrically conductive carbon compounds. In another aspect, the conductive rubber compositions can be prepared by first adding the one or more conductive carbon components into the polymer phase, thereby creating a filler network in the continuous polymer phase in the finished product. In a further aspect, the conductive carbon component can be or include one or more of the following: carbon black, a short carbon fiber, graphite powder, or graphene powder. Following mixing, the conductive rubber compositions can optionally be vulcanized. The conductive rubber compositions have good mechanical properties and electrical resistivity and can be processed using existing equipment.