A masterbatch composition including glass bubbles and a toughening agent in a blend of syndiotactic 1,2-poly-butadiene and cis-1,4-polybutadiene is disclosed. The glass bubbles are present in an amount of at least 25 percent by weight, based on the total weight of the masterbatch composition. A method of making a rubber composition from the masterbatch composition is disclosed as well as a rubber composition and vulcanized rubber made from the masterbatch composition. A rubber composition that includes syndiotactic 1,2-polybutadiene, cis-1,4-polybutadiene, a toughening agent that includes at least one of a fluoroplastic or an organic or ceramic fiber, and glass bubbles in an amount up to 25 percent by weight, based on the total weight of the rubber composition, is also disclosed.

As the sealant material composition forming a sealant layer of a pneumatic tire provided with the sealant layer on a tire inner surface, the sealant material composition prepared by blending from 0.1 parts by mass to 20 parts by mass of a crosslinking agent, from 0.1 parts by mass to 40 parts by mass of an organic peroxide, and from 10 parts by mass to 400 parts by mass of a liquid polymer per 100 parts by mass of a butyl rubber is used.

In accordance with one aspect of the exemplary embodiment, a rubber composition includes at least 20 phr of a composite material, at least 3 phr of a conjugated diene elastomer, a cure activator, and a sulfur-based cure agent. The composite material includes a reinforcing carbon black dispersed in natural rubber. The composite material and conjugated diene elastomer together provide at least 90 phr of vulcanizable elastomers in the rubber composition. The rubber composition may further include a reinforcing filler other than carbon black. The reinforcing filler may include silica. The rubber composition may include at least 5 phr, or at least 8 phr of silica, or up to 30 phr, or up to 18 phr of silica.

A laminate has an olefin-aromatic vinyl compound-aromatic polyene copolymer and a metal foil. The number average molecular copolymer weight is between 5000 and 100000; the aromatic vinyl compound monomer is aromatic vinyl compound having between 8 and 20 carbon atoms, and the aromatic vinyl compound monomer unit content is between 10 and 60 mass %; the aromatic polyene is selected having between 5 and 20 carbon atoms and vinyl and/or vinylene groups in the molecule, the content derived from the aromatic polyene unit is between 1.5 and 20 pieces per number average molecular weight; and the olefin is selected having between 2 and 20 carbon atoms, being ethylene alone, or having a mass ratio of ?-olefin monomer components other than ethylene to an ethylene monomer component contained in the olefin, of 1/7 or less, and the total monomer units of the olefin, aromatic vinyl compound, and aromatic polyene is 100 mass %.

A self-reinforcing composite gel includes a solvent, and a plurality of swellable crosslinked polymer particles dispersed in a crosslinked polymer matrix, wherein the crosslinked polymer matrix and the plurality of swellable crosslinked polymer particles are immersed in the solvent, wherein the swellable crosslinked polymer particles absorb more solvent at equilibrium than the matrix polymer, and wherein the plurality of swellable crosslinked polymer particles swell in the solvent and are present in an amount sufficient to maintain or increase the elastic modulus and/or load-bearing ability of the self-reinforcing composite gel, i.e., compared to that of the crosslinked matrix polymer alone, upon swelling in the solvent.

Provided are a tow prepreg comprising a reinforcing fiber bundle impregnated with a matrix resin composition, wherein the matrix resin composition contains a component (A) (an epoxy resin), a component (B) (dicyandiamide), a component (C) (a curing accelerator), and a component (D) (a core-shell type rubber particle), and a content of the component (D) with respect to 100 parts by mass of the component (A) is from 20 to 70 parts by mass, a viscosity is from 3 Pa.Math.s to 80 Pa.Math.s at 30 C., and a minimum viscosity to be obtained when a viscosity is measured by raising a temperature from room temperature to 130 C. at a rate of temperature rise of 2.0 C./min is from 0.04 Pa.Math.s to 1 Pa.Math.s, which exhibits excellent drape property and tackiness and less stickiness and can be unwound at a high speed; and a composite material-reinforced pressure vessel having fewer voids in a reinforcing layer which is obtainable by using the tow prepreg, a high burst pressure, and an excellent appearance due to appropriate resin flow.

An expanded polymeric material which consists of at least 200 phr, preferably at least 300 phr, but less than 1000 phr, preferably less than 700 phr ingredients in total, comprising 100 phr of at least one polymer, of which at least one is a sulphur and/or metal oxide crosslinkable elastomer and at least 40 phr, preferably at least 55 phr of at least one polymeric flame retardant, preferably a brominated polymeric flame retardant.

Blends of elastomer composites with unfilled or less highly filled elastomer reduces hysteresis without compromising reinforcement. Hysteresis may also be reduced by adjusting the compounding method.

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.

Polymer masterbatch compositions, the production and use thereof, as well as vulcanizable rubber compounds comprising these masterbatch compositions, and their use for the production of moldings in the production of tires.