According to the process for preparing a vulcanized rubber composition of the invention comprising (a) a step of preparing a master batch comprising a butadiene rubber and silica, (b) a step of preparing a master batch comprising an isoprene rubber and silica, (c) a step of kneading the master batch obtained in (a) and the master batch obtained in (b), and (d) a step of vulcanizing a kneaded product obtained in (c), wherein the obtained vulcanized rubber composition has a BR phase and a IR phase which are incompatible with each other and comprises a predetermined amount of a terpene resin, a predetermined abundance ratio α of silica in the BR phase satisfies 0.3≦α≦0.7 (Relation 1), and a proportion β of the butadiene rubber satisfies 0.4≦β≦0.8 (Relation 2) it is possible to improve performance on ice, wet performance and abrasion resistance in good balance and to provide a vulcanized rubber composition having excellent performance on ice, wet performance and abrasion resistance, and a studless tire with a tread made using the same.

Crumb rubber obtained from recycled tires is subjected to an interlinked substitution process. The process utilizes a reactive component that interferes with sulfur bonds. The resulting treated rubber exhibits properties similar to those of the virgin composite rubber structure prior to being granulated, and is suitable for use in fabricating new tires, engineered rubber articles, and asphalt rubber for use in waterproofing and paving applications.

A method for preparing a vulcanizable composition of matter, the method comprising mixing rubber, silica, silica coupling agent, a strong base, and nicotinamide to form a masterbatch, introducing a curative to the masterbatch, and mixing the curative into the masterbatch to form a vulcanizable composition of matter.

According to the process for preparing a vulcanized rubber composition of the invention comprising (a) a step of preparing a master batch comprising a modified conjugated diene polymer and silica, (b) a step of preparing a master batch comprising an isoprene rubber and silica, (c) a step of kneading the master batch obtained in (a) and the master batch obtained in (b), and (d) a step of vulcanizing a kneaded product obtained in (c), wherein the obtained vulcanized rubber composition comprises a phase A comprising a modified conjugated diene polymer and a phase B comprising an isoprene rubber, which are incompatible with each other, an abundance ratio α of silica in the phase A satisfies 0.5≦α≦0.9 (Relation 1), and a proportion β of the modified conjugated diene polymer satisfies 0.4≦β≦0.8 (Relation 2) it is possible to improve performance on ice and abrasion resistance and to provide a vulcanized rubber composition having excellent performance on ice and abrasion resistance, and a studless tire with a tread made using the same.

According to a production method of a rubber composition for tire of the present invention comprising a rubber component (A) comprising at least one selected from the group consisting of a natural rubber and a synthetic diene rubber, a filler, a coupling agent (D) of (C.sub.pH.sub.2p+1O).sub.3—Si—(CH.sub.2).sub.q—S—CO—C.sub.kH.sub.2k+1, and a vulcanizing agent (E) comprising a vulcanizer and a vulcanization accelerator, the method comprising: a step X1 of kneading all amount of A, a part of the filler and a part of D, a step X2 of kneading the kneaded product of step X1, the remaining amount of the filler and D, and a step F of kneading the kneaded product of step X2 and E, it is possible to produce a rubber composition for tire in which fuel efficiency and abrasion resistance are improved in a good balance.

The present invention describes thermoplastic vulcanizates (TPVs) and methods for forming TPVs that include addition of a masterbatch comprising antioxidant (AO) additives to improve UV weatherability of TPVs. The hindered phenol antioxidants have a melting point of 85° C. or less, and comprise an alkyl chain longer than 12 carbons. A method may comprise compounding a carbon black, carrier resin, and hindered phenol antioxidant to form a masterbatch and dynamically vulcanizing the masterbatch, a vulcanizable elastomer, a thermoplastic resin, and a process oil to yield a TPV.

Disclosed are polymeric compositions comprising polyhydroxyalkanoates. These compositions can comprise a blend comprising a polyhydroxyalkanoate (PHA) polymer, and a rubber polymer. The blend can comprise a biphasic mixture comprising a first phase comprising the PHA polymer, and a second phase comprising the rubber polymer dispersed with the first phase. The rubber polymer can be crosslinked, for example, through reaction with a free radical initiator. By incorporating the dynamically crosslinked rubber polymer, the polymer composition can exhibit one or more improved characteristics relative to PHA alone, including improved thermal stability, improved melt strength, improved flexibility, improved toughness, or a combination thereof. Also provided are articles formed at least in part from these polymeric compositions, as well as methods of making these polymeric compositions.

Provided are a sheet, a method of its preparation, and a tire comprising the sheet, wherein the sheet comprises tire cords, a topping rubber for topping the tire cords, and a conductive fiber located on the surface of the topping rubber. The sheet can provide tires, on which a rubber composition with a low electricity-transmitting property and low rolling resistance is applied, with excellent conductivity.

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.

Crumb rubber obtained from recycled tires is subjected to an interlinked substitution process. The process utilizes a reactive component that interferes with sulfur bonds. The resulting treated rubber exhibits properties similar to those of the virgin composite rubber structure prior to being granulated, and is suitable for use in fabricating new tires, engineered rubber articles, and asphalt rubber for use in waterproofing and paving applications.