A process for producing a conjugated diene-based polymer which comprises, in the first modification, modifying a conjugated diene-based polymer having active chain ends, which is obtained by polymerizing a diene-based monomer singly or with other monomers and has a content of a cis-1,4 unit of 75% by mole or greater in the conjugated diene portion of the main chain, by reacting the active chain ends with a hydrocarbyloxysilane compound and reacting the modified polymer with a specific compound such as a hydrocarbyloxysilane compound, and a rubber composition containing the polymer modified in accordance with the above process and, preferably, 10 to 100 parts by weight of silica and/or carbon black per 100 parts by weight of the rubber component containing the modified polymer, are provided. The rubber composition containing silica and/or carbon black exhibits improved fracture properties, abrasion resistance, low heat buildup property and excellent workability. A process for producing a conjugated diene-based polymer exhibiting improved cold flow, a polymer produced in accordance with the process, and a rubber composition and a tire using the polymer are also provided.

Conjugated diene polymer, process for its production and rubber compositions containing the same

1. A flame-retardant resin composition comprising (A) (1) a resin component (Component A- 1 ) containing 50 to 100% by weight of an aromatic polycarbonate resin and 0 to 50% by weight of a styrene-containing resin or (2) a resin component (Component A- 2 ) containing 20 to 80% by weight of a polyphenylene ether resin and 80 to 20% by weight of a polystyrene, provided that Component A- 1 or Component A- 2 will be referred to as Component A, and (B) a flame retardant (Component B) that is a phosphoric ester of the following formula (I), the phosphoric ester containing, per 100% by weight thereof, 3% by weight or less of a component having a condensation degree n of 0, 86.5 to 98.5% by weight of a component having a condensation degree n of 1, 1 to 9% by weight of a component having a condensation degree n of 2 and 1.5% by weight or less of a component having a condensation degree n of ≧3, and having a weight average condensation degree N in the range of 1.01 to 1.10 when the weight average condensation degree N is calculated without the component having a condensation degree n of 0, the flame-retardant resin composition containing, per 100% by weight of the total of Component A and Component B, 65 to 99% by weight of Component A and 1 to 35% by weight of Component B, The resin composition of the present invention has excellent flame retardancy, especially, excellent retardancy in the form of a molded product having a small wall thickness, and has good impact resistance, and further, it is suitable for forming a large-sized molded product having a small wall thickness which requires rigidity and surface properties.

Flame-retardant resin composition

A thermoplastic resin composition characterized by being produced by a process involving the step of blending a thermoplastic resin (A) with at least one non-polymerizable liquid substance (B) which is an additive for the resin (A) and can take a liquid form within the temperature range of 25 to 300 DEG C, wherein the blending is conducted at a temperature falling within the range of 25 to 300 DEG C at which the substance (B) can be kept in a liquid state, the composition being substantially equivalent to that prepared by a process comprising dissolving the resin (A) in the substance (B) or swelling the resin (A) with the substance (B). Molding the resin composition gives articles excellent in appearance, light resistance and mechanical characteristics, so that the resin composition can be advantageously used as molding material in various fields including components of office automation machines, components of domestic electrical appliances, and electronic and electrical components. Further, the resin composition is particularly useful as the master batch to be mixed with other molding resins. The use of the resin composition as the master batch can facilitate the melt molding of a resin composition comprising the master batch and other molding resin and can reduce the thermal history of the resin contained in the master batch, thus giving molded articles excellent in the above characteristics.

Thermoplastic resin composition

A thermoplastic resin composition is described, which comprises 100 parts by weight of a resin mixture consisting of (A) 40 to 90 parts by weight of an aromatic polycarbonate, (B) 1 to 60 parts by weight of a graft copolymer prepared by graft copolymerizing an aromatic vinyl monomer and a monomer copolymerizable with the aromatic vinyl monomer in the presence of a rubbery polymer, and (C) 0 to 40 parts by weight of a copolymer prepared by copolymerizing an aromatic vinyl monomer and a monomer copolymerizable with the aromatic vinyl monomer and (D) 1 to 30 parts by weight of a phosphazene. This composition may be used as a flame retardant.

Flame-retardant thermoplastic resin composition

A thermoplastic resin composition which comprises (A) a thermoplastic polymer containing a unit containing glutaric anhydride and represented by the following general formula (1): (wherein R1 and R2 are the same or different and each represents hydrogen or C1-5 alkyl) and (B) a rubbery polymer and which satisfies the following (I) and/or (II): (I) the thermoplastic resin composition has a total light transmittance of 90% or higher per 2-mm thickness; and (II) the thermoplastic polymer (A) has a weight-average molecular weight of 30,000 to 150,000 and a glass transition temperature of 130°C or higher. The thermoplastic resin composition has high heat resistance, mechanical properties, colorlessness, transparency, optical isotropy, and moldability and further has solvent resistance.

Thermoplastic resin composition, molded article, and film

PURPOSE:To obtain the subject composition which can prevent the melting and dripping on burning and is excellent in flame retardancy, impact resistance, heat resistance and flowability. CONSTITUTION:This resin composition contains a thermoplastic resin, a flame retardant and a fluororesin, wherein the ratio of the flame-out time of the composition after heat treatment (at 130 deg.C for 2hr) to that before heat treatment (according to the provisions of the UL 94 Vertical Test Method), which serves as an index of the molecular orientation of the fluororesin, is at most 0.7:1.

Thermoplatic resin composition containing fluororesin

PURPOSE:To provide a thermoplastic resin composition having high-level molding processability (fluidity), heat resistance and impact resistance. CONSTITUTION:This resin composition comprises (A) a thermoplastic resin, (B) an organophosphorus compound represented by hydroxyl group-contg. aromatic phosphoric ester and (C) a processing auxiliary selected from aliphatic hydrocarbons, higher fatty acids, higher fatty acid esters, higher fatty acid amides, higher aliphatic alcohols and metallic soaps, and having specific absolute values of the differences for the solubility parameters (SP values) between the components A, B and C.

Thermoplastic resin composition excellent in both molding processability and heat resistance

PROBLEM TO BE SOLVED: To provide an aromatic vinyl/vinyl cyanide compound/N-substituted maleimide copolymer having heat resistance, transparency and high mechanical strengths and having a content of residual unreacted N-substituted maleimide of 50ppm or below and to provide a thermoplastic resin composition containing the same. SOLUTION: This copolymer comprises 30-70wt.% units derived from an aromatic vinyl compound, 4-40wt.% units derived from a vinyl cyanide compound and 26-50wt.% units derived from an N-substituted maleimide and has the following properties: the compositional distribution is narrow for every fraction prepared by fractionating the sample on the basis of the molecular weight determined by GPC, it is substantially free from acetone insolubles, the weight- average molecular weight is 100,000-300,000, the number-average molecular weight is 50,000-150,000, and the content of residual unreacted N-substituted maleimide is 50ppm or below. The composition contains the above copolymer.

Thermoplastic copolymer and thermoplastic resin composition containing the same

PURPOSE:To obtain a thermoplastic resin composition having weathering resistance, impact resistance and rigidity by preparing a three-layered graft copolymer particle wherein the respective layers are composed of specified different acrylic ester graft copolymers. CONSTITUTION:A multilayer graft copolymer which is a three-layered particle (of a mean particle diameter of 0.2-0.8mum), wherein the first layer (the innermost layer) comprises 30-80 pts.wt. rubberlike polymer particles comprising a crosslinked acrylic ester polymer, the second layer comprises a rubberlike elastomer layer prepared by graft-polymerizing 10-30 pts.wt. monomer mixture comprising 20-80wt.% acrylic ester, 0.05-5wt.% crosslinking agent, 5-75wt.% aromatic vinyl and 5-50wt.% vinyl cyanide in the presence of the above rubberlike copolymer particles, and the third layer (the outermost layer) is prepared by graft- polymerizing 10-40 pts.wt. monomer mixture comprising 0-20wt.% acrylic ester, 30-90wt.% aromatic vinyl and 10-50wt.% vinyl cyanide in the presence of the second layer particles.

Multilayer graft copolymer

PROBLEM TO BE SOLVED: To provide an agent for suppressing the drip of live coals (fire source) of a styrene resin composition which permits the styrene resin composition to be preventive to melt drip upon combustion and excellent in fire retardancy, impact resistance, heat resistance fluidity. SOLUTION: This agent for suppressing the drip of live coals (fire source) of a styrene resin composition comprises a non-alkenylated organic phosphorus compound (A), an alkenylated organic phosphorus compound (B), and/or a glassy compound (C) with a softening temperature of 200-380 deg.C. The resin composition comprises 100 pts.wt. styrene resin, 1-100 pts.wt. polyphenylene ether and 1-50 pts.wt. foregoing agent for suppressing the drip of live coals (fire source).

Nishihara Hajime

Papers

Thermoplatic resin composition containing fluororesin

Thermoplastic resin composition excellent in both molding processability and heat resistance

Thermoplastic copolymer and thermoplastic resin composition containing the same

Multilayer graft copolymer

Agent for suppressing drip of live coals (fire source) or styrene resin composition