To improve the thermal stability of a brominated polymer type flame retardant in a flame-retardant resin composition containing a styrene-based resin and the brominated polymer type flame retardant to provide a flame-retardant resin molded article in which occurrences of black foreign substances and discoloration decrease. The flame-retardant resin composition contains 0.8 to 15 parts by mass of a halogen capture agent, 0.8 to 7 parts by mass of an antioxidant, and 0.8 to 6 parts by mass of liquid paraffin based on a total of 100 parts by mass of a styrene-based resin and brominated polymer type flame retardant, and a content of bromine is 18 to 42% by mass.

Provided herein are polymerization processes and polymer compositions including reactor blends formed by such polymerization processes. The polymerization processes include copolymerization using two metallocene catalyst systems: the first catalyst system capable of producing polymers having 60% or more vinyl terminations, the second catalyst system capable of producing high molecular weight polymers, preferably incorporating at least some of the polymers produced by the first catalyst system into the high molecular weight polymers. The reactor blends formed thereby therefore include first and second copolymer components, which may differ in monomer content and weight-average molecular weight (Mw). Furthermore, the reactor blends may exhibit advantageous rheological properties, at least some of which are consistent with long-chain branching. Preferred reactor blends comprise ethylene-propylene-diene (EPDM) terpolymers.

In methods for forming thermoplastic vulcanizates, and thermoplastic vulcanizates formed by such methods, a masterbatch comprising one or more additives in a carrier resin comprising propylene- or ethylene-based copolymer is added to the thermoplastic vulcanizate formulation. The resulting thermoplastic vulcanizate may additionally be passed through a 200 mesh or finer screen and thereafter extruded. The thermoplastic vulcanizates may exhibit increased extrusion throughput rates and enhanced surface smoothness.

In methods for forming thermoplastic vulcanizates, and thermoplastic vulcanizates formed by such methods, a masterbatch comprising one or more additives in a carrier resin comprising propylene- or ethylene-based copolymer is added to the thermoplastic vulcanizate formulation. The resulting thermoplastic vulcanizate may additionally be passed through a 200 mesh or finer screen and thereafter extruded. The thermoplastic vulcanizates may exhibit increased extrusion throughput rates and enhanced surface smoothness.

Provided is a thermosetting resin composition that can satisfy both low transmission loss and radiation performance even under the same curing conditions as those for conventional substrate materials for high-frequency applications, and also provided are an adhesive sheet, a prepreg, and a laminate.

The thermosetting resin composition comprises a maleimide compound having at least two maleimide groups per molecule, a polyphenylene ether compound having at least two reactive organic groups per molecule, a curing accelerator, and an inorganic filler, wherein the inorganic filler is low-sodium aluminum oxide, and the low-sodium aluminum oxide has an Na.sup.+ ion content of 10 ppm or less.

Provided are a heat-curable maleimide resin composition capable of yielding a cured product superior in tracking resistance; and a semiconductor device encapsulated by the cured product of such resin composition. The heat-curable maleimide resin composition for semiconductor encapsulation contains: (A) a maleimide compound being solid at 25 C., and having, per molecule, at least one dimer acid backbone, at least one linear alkylene group having not less than 6 carbon atoms, and at least two maleimide groups; (B) an inorganic filler; and C) a curing accelerator.

A coating composition comprising; a polyester material, and benzoguanamine or a derivative thereof, wherein the coating composition is substantially free of bisphenol A (BPA), bisphenol F (BPF), bisphenol A diglycidyl ether (BADGE) and bisphenol F diglycidyl ether (BFDGE), and wherein the coating composition, when cured, has a flexibility of at least 20 mm as measured according to the draw and re-draw test method with processing in 1% salt (NaCl) solution in tap water at 130 C. for 60 minutes and a scratch resistance of at least 700 g as measured according to ISO Standard 1518-1:2011.

Processes are provided which include copolymerization using one or both of a metallocene catalyst capable of producing high molecular weight polymers and a metallocene catalyst capable of producing polymers having 60% or more vinyl terminations. Polymerization processes include dual catalyst polymerization in a single polymerization zone comprising both metallocene catalysts. Other processes include serial or parallel polymerizations in multiple polymerization zones, using either or both catalysts in each polymerization zone. Such polymerization processes produce reactor blends, and are particularly suited for producing copolymer compositions (such as EP or EPDM copolymer compositions) exhibiting improved melt elasticity and rheological properties.

Use of a coating composition on a chromium free tinplate substrate, the coating composition comprising: a polyester material, and benzoguanamine or a derivative thereof, wherein the coating composition is substantially free of bisphenol A (BPA), bisphenol F (BPF), bisphenol A diglycidyl ether (BADGE) and bisphenol F diglycidyl ether (BFDGE).

A rubber mix for tires including at least one cross-linkable polymer base, a reinforcing filler, a vulcanization system, a reinforcing resin and a dithiol chemical according to the formula SHRSH, wherein, in the formula, R is an aliphatic or aromatic group composed of 3 to 12 atoms.