A process for retreading a tire, the process comprising the steps of providing a tire casing, providing a cured rubber component having first and second planar surfaces, providing a cushion gum, wherein the cushion gum contains a cure system comprising at least one stable aryl dinitrile oxide compound, applying the cushion gum to the tire casing, and forming a tire composite by applying the second planar surface of the cured rubber component to the cushion gum.

A medical rubber composition can contain, comprise, consist, or consist essentially of: (a) an isobutylene-isoprene rubber: (b) a diene-based rubber; and a silica having a BET specific surface area not lower than 130 m.sup.2/g. An amount of (a) the isobutylene-isoprene rubber contained in 100 parts by mass of a rubber component composed of (a) the isobutylene-isoprene rubber and (b) the diene-based rubber can be larger than 30 parts by mass and smaller than 55 parts by mass.

A resin composition and an article made therefrom are provided. The resin composition includes: (A) 100 parts by weight of a polyolefin, which is different from the copolymer in (B) below; (B) 20 parts by weight to 150 parts by weight of a copolymer, the copolymer having a structural unit formed by a monomer of Formula (1) and a structural unit formed by a monomer of Formula (2), and the content of the structural unit formed by the monomer of Formula (2) in the copolymer is 55 wt % to 90 wt %; and (C) 10 parts by weight to 40 parts by weight of an unsaturated bond-containing crosslinking agent. The resin composition may be used to make various articles, such as a prepreg, a resin film, a laminate or a printed circuit board, and at least one of the following properties can be improved, including glass transition temperature, multi-layer board heat resistance, interconnect stress test, dissipation factor aging rate, temperature coefficient of dielectric constant, temperature coefficient of dissipation factor and branch-like pattern at laminate edges.

The present invention relates to a method of preparing a hierarchically porous polymer and a hierarchically porous polymer prepared thereby. The method comprises the steps of: (a) polymerizing an external oil phase of a high internal phase emulsion (HIPE) consisting aqueous droplets to produce a cross-linked block copolymer; (b) obtaining a macroporous polymer with interconnected macropores by removing the aqueous droplets; and (c) treating the obtained porous polymer with a base, thereby obtaining a hierarchically porous polymer having three-dimensional mesopores formed in the macroporous walls. According to the method, the macropore size and mesopore size of the hierarchically porous polymer can all be controlled. The hierarchically porous polymer prepared by the method can easily separate polymers having different sizes, and thus is highly useful in the polymer separation field.

Provided is a rubber composition for tires which can prevent discoloration and improve ozone resistance while maintaining or improving good elongation at break, and further can be produced with high efficiency. Also provided are a pneumatic tire formed from the same, and a method for producing the same. Included is a rubber composition for tires, including: a rubber component; a phenylenediamine antioxidant; and a masterbatch, the masterbatch containing a specific nonionic surfactant and a silica having a BET value of 40-250 m.sup.2/g at a mass ratio of 1:5 to 1:0.15, the rubber component containing a diene rubber in an amount of 70-100% by mass per 100% by mass of the rubber component, the rubber composition including, per 100 parts by mass of the rubber component, 1.0-10.0 parts by mass of the phenylenediamine antioxidant and 0.1-5.0 parts by mass of the nonionic surfactant introduced in the form of the masterbatch.

A resin composition is provided. The resin composition comprises the following components: (a) a thermal-curable resin system, which has a dielectric loss (Df) of not higher than 0.008 at 10 GHz and comprises a bismaleimide resin of the following formula (I),

##STR00001## wherein M1 and the Z1 groups are as defined in the specification; and (b) an organic compound of the following formula (II) or formula (III),

##STR00002## wherein R, R11 to R19 and R21 to R28 are as defined in the specification, and wherein the amount of the organic compound (b) ranges from 1 wt % to 30 wt % based on the total weight of the resin system (a) and the organic compound (b).

A thermoplastic resin composition having an excellent moldability capable of producing a molded article having excellent chemical resistance, and in particular, an excellent chemical resistance in TD is provided. The thermoplastic resin composition of the present invention is a thermoplastic resin composition produced by blending 40 to 90 parts by weight of a vinyl copolymer (A) prepared by copolymerization of a vinyl monomer mixture (a) comprising at least 5 to 40% by weight of an aromatic vinyl monomer (a1), 30 to 80% by weight of an unsaturated alkyl carboxylate ester monomer (a2), and 10 to 50% by weight of a cyanated vinyl monomer (a3) and 10 to 60 parts by weight of a graft copolymer (B) prepared by graft copolymerization of a vinyl monomer mixture (b) comprising at least 10 to 30% by weight of an aromatic vinyl monomer (b1), 30 to 80% by weight of an unsaturated alkyl carboxylate ester monomer (b2), and 1 to 10% by weight of a cyanated vinyl monomer (b3) in the presence of a rubbery polymer (r); wherein acetone-soluble content (C) of the thermoplastic resin composition has a number average molecular weight of 65,000 to 90,000.

A rubber composition for a hollow ball includes a base rubber, an inorganic filler composed of a large number of flat particles, and a carbon-based filler. As to the carbon-based filler, a degree of flatness DLc obtained by dividing an average particle diameter D.sub.50.sup.c (m) by an average thickness Tc (m) is not less than 50. A weight ratio Mc/Mi is not less than 0.01 and not greater than 1.00. The rubber composition is obtained by a production method including: a first step of mixing the base rubber and the carbon-based filler to obtain a master batch; and a second step of adding the large number of flat particles that form the inorganic filler, to the master batch to orient the large number of flat particles. The hollow ball 2 includes a core 4 formed from the rubber composition.

The present invention relates to a soundproof tyre for vehicle wheels comprising a noise reducing element made by vulcanising a vulcanisable and expandable elastomeric compound comprising at least one elastomeric polymer, at least one expanding agent, and at least one compound selected from the group of (i) fatty acid amides and (ii) polymers and copolymers of caprolactone, lactic acid, glycolic acid, and mixtures thereof.

Resin composition, insulating resin film and use thereof. The resin composition comprises the following components in parts by mass: 50-90 parts of a hydrogenated hydrocarbon resin and 10-50 parts of a benzocyclobutene resin; the benzocyclobutene resin comprises at least one structural unit A and at least one structural unit B. The hydrogenated hydrocarbon resin and the benzocyclobutene resin with a specific structure are both total-hydrocarbon structures, having low dielectric constant Dk, dielectric loss tangent Df, and water absorption rate. The benzocyclobutene resin can be thermally cured to obtain the high cross-linking density, high glass transition temperature, and excellent heat resistance. The resin composition and the insulating resin film prepared therewith have ultra-low dielectric constant and loss tangent, excellent dielectric properties, heat resistance, damp heat resistance, adhesion strength, and excellent mechanical properties such as flexibility, satisfying the performance requirements of electronic components being high frequency, high speed, and high integration.