There is disclosed a talc particulate having a d.sub.50 of from about 0.5 to 5.0 μm and comprising less than about 500 ppm of particles having a particle size of equal to or greater than 45 μm and a shape factor equal to or greater than about 40. A process for making the talc particulate is also disclosed. The talc particulate may be used in polymer compositions as a filler from which polymer composites and articles may be formed.

A UV-thickening thermally conductive silicone grease composition: which has (A) an organopolysiloxane, the viscosity at 25° C. of which is 50-100,000 mPa.Math.s and which contains at least one alkenyl group in a single molecule, (B) an organohydrogenpolysiloxane, a single molecule of which contains a hydrogen atom directly bonded to at least two silicon atoms, (C) a photoactive platinum complex curing catalyst, and (D) a thermally conductive filler with a thermal conductivity of at least 10 W/m.Math.° C. as essential components; and the viscosity at 25° C. of which is 30-800 Pa.Math.s when measured at a 10 rpm rotation rate using a Malcom viscometer. For this UV-thickening thermally conductive silicone grease composition, shape-retaining properties at low viscosity are high, deep curing properties can be adjusted using the UV irradiation dose, and the composition after being thickened by irradiating UV rays does not become hard but sets so as to be malleable.

Provided is a composition for a heat-shrinkable tube, comprising: a base resin; and a flame retardant, wherein the base resin comprises chlorinated polyolefin resin and polyolefin elastomer, wherein the chlorinated polyolefin resin comprises chlorine in an amount of 30 to 40% by weight based on the total weight thereof, and the polyolefin elastomer has a melting point of 95 to 120° C., and an amount of the chlorinated polyolefin resin is 40 to 60 parts by weight and an amount of the polyolefin elastomer is 20 to 40 parts by weight, based on 100 parts by weight of the base resin.

The present invention provides a process for making a silica masterbatch that contains hydrophobated silica, solution-made rubber and emulsion-made rubber. Hydrophobated silica is mixed into a latex emulsion. Solution-rubber crumb in an aqueous suspension is mixed into the latex emulsion, which is coagulated, and a crumb is recovered, further homogenized, dried and baled to yield the silica masterbatch. A well-dispersed mixture of hydrophobated silica and emulsion-made rubber is added into a steam distillation step of a solution-rubber process from which a silica masterbatch is recovered. The emulsion-made rubber can be omitted to make a silica masterbatch of solution rubber and silica without emulsion rubber. The silica masterbatch has physical properties similar to those found in a comparable dry-mixed composition, but the silica masterbatch can be incorporated more easily and less expensively into tires and other rubber products than the dry-mixed composition.

A method for preparing a vulcanizable composition of matter, the method comprising mixing, within a first mixing step, rubber, silica, and silica coupling agent to form a first masterbatch composition, adding nicotinamide to the first masterbatch composition and mixing within a second mixing step to form a second masterbatch composition, and adding a curative to the second masterbatch composition and mixing within a final mixing step.

A method for preparing a vulcanizable composition of matter, the method comprising mixing, within a first mixing step, rubber, silica, and silica coupling agent to form a first masterbatch composition, adding nicotinamide to the first masterbatch composition and mixing within a second mixing step to form a second masterbatch composition, and adding a curative to the second masterbatch composition and mixing within a final mixing step.

Provided is a semiconductor nanoparticle complex in which two or more kinds of ligands including a ligand I and a ligand II are coordinated to a surface of a semiconductor nanoparticle. The ligands are each an organic ligand including an organic group and a coordinating group. The ligand I is a thiocarboxylic acid represented by the following general formula (1). The mole fraction of the ligand I in the ligands is 0.2 mol % to 35.0 mol %.

General formula (1):

HS—X—(COOH)n  (1)

(In general formula (1), X is a (n+1)-valent hydrocarbon group, and n is a natural number of 1 to 3.) The present disclosure provides a semiconductor nanoparticle complex dispersible at a high mass fraction in a dispersion medium having polarity while a high fluorescence quantum yield (QY) of the semiconductor nanoparticle is retained.

Methods to control the flow behavior of non-Newtonian materials are described. Methods can increase the shear-thinning behavior of non-Newtonian materials such as aqueous suspensions, polymer melts and solutions, etc. Methods include induction of electrostatic charges to the surface of particles, e.g., nanostructures, held in suspension in the materials. The suspensions include different types of particles having different point of zero charge. Electrostatic charges are induced through adjustment of the pH of a suspension containing the particles, thereby modifying rheological characteristics of the material.

Methods to control the flow behavior of non-Newtonian materials are described. Methods can increase the shear-thinning behavior of non-Newtonian materials such as aqueous suspensions, polymer melts and solutions, etc. Methods include induction of electrostatic charges to the surface of particles, e.g., nanostructures, held in suspension in the materials. The suspensions include different types of particles having different point of zero charge. Electrostatic charges are induced through adjustment of the pH of a suspension containing the particles, thereby modifying rheological characteristics of the material.

The present invention aims to provide a fluororesin composition for a molded product that is excellent in tensile strength and flex resistance. The present invention relates to a fluororesin composition that contains a fluororesin and a fluorinated nanodiamond. The amount of the fluorinated nanodiamond is 0.001 to 5% by mass based on the fluororesin.