摘要:
A tire for vehicle wheels, includes at least one structural element obtained by crosslinking a crosslinkable elastomeric composition including at least one vulcanized rubber in a subdivided form surface treated with at least one oxidizing agent; at least one diene elastomeric polymer, and at least one sulfur-based vulcanizing agent. A surface treatment process of vulcanized rubber and crosslinkable elastomeric composition is obtained with the vulcanized rubber in a subdivided form surface treated with at least one oxidizing agent.
摘要:
A tire for vehicle wheels, includes at least one structural element obtained by crosslinking a crosslinkable elastomeric composition including at least one vulcanized rubber in a subdivided form surface treated with at least one oxidizing agent; at least one diene elastomeric polymer, and at least one sulfur-based vulcanizing agent. A surface treatment process of vulcanized rubber and crosslinkable elastomeric composition is obtained with the vulcanized rubber in a subdivided form surface treated with at least one oxidizing agent.
摘要:
A thermoplastic elastomeric material includes a vulcanized rubber in a subdivided form surface-grafted with at least one vinyl polymer, wherein the amount of the surface-grafted vinyl polymer is not lower than 60% by weight, preferably not lower than 70% by weight, more preferably not lower than 80% by weight, with respect to the total weight of the surface-grafted vinyl polymer and the vulcanized rubber in a subdivided form.
摘要:
A process for producing an epoxidized elastomeric polymer by feeding at least one elastomeric polymer containing ethylenic unsaturation to a mixing device; feeding at least one hydrogen peroxide precursor to the mixing device; feeding at least one carboxylic acid or a derivative thereof to the mixing device; mixing and reacting, in the presence of water, the at least one elastomeric polymer containing ethylenic unsaturation with the at least one hydrogen peroxide precursor and the at least one carboxylic acid or a derivative thereof, to obtain an epoxidized elastomeric polymer; and discharging the resulting epoxidized elastomeric polymer from the mixing device.
摘要:
A tire includes at least one structural element including a crosslinked elastomeric material obtained by crosslinking a crosslinkable elastomeric composition including: (a) an amount higher than or equal to 30 phr, preferably 40 phr to 100 phr, of at least one polyisoprene rubber; (b) an amount lower than or equal to 70 phr, preferably 0 phr to 60 phr, of at least one diene elastomeric polymer other than the polyisoprene rubber (a); (c) an amount higher than or equal to 30 phr, preferably 40 phr to 120 phr, of at least one carbon black reinforcing filler; (d) 0.2 phr to 10 phr, preferably 1 phr to 5 phr, of at least one copolymer of at least one ethylenically unsaturated carboxylic acid or a derivative thereof with at least one ethylenically unsaturated monomer containing at least one polyoxyalkylene side chain. Preferably, the structural element is a tire's sidewall.
摘要:
A tire includes at least one structural element including a crosslinked elastomeric material obtained by crosslinking a crosslinkable elastomeric composition including: (a) an amount higher than or equal to 30 phr, preferably 40 phr to 100 phr, of at least one polyisoprene rubber; (b) an amount lower than or equal to 70 phr, preferably 0 phr to 60 phr, of at least one diene elastomeric polymer other than the polyisoprene rubber (a); (c) an amount higher than or equal to 30 phr, preferably 40 phr to 120 phr, of at least one carbon black reinforcing filler; (d) 0.2 phr to 10 phr, preferably 1 phr to 5 phr, of at least one copolymer of at least one ethylenically unsaturated carboxylic acid or a derivative thereof with at least one ethylenically unsaturated monomer containing at least one polyoxyalkylene side chain. Preferably, the structural element is a tire's sidewall.
摘要:
A crosslinkable elastomeric composition has at least one vulcanized rubber in a subdivided form surface treated with at least one silane coupling agent, at least one diene elastomeric polymer and at least one sulfur-based vulcanizing agent. The crosslinkable elastomeric composition is advantageously used in the production of crosslinked manufactured products, in particular, in the production of tires for vehicle wheels.
摘要:
A process for manufacturing a thermoplastic elastomeric material includes at least one elastomeric phase and at least one thermoplastic phase by the following steps: surface-treating a vulcanized rubber in a subdivided form with an effective amount of at least one organometallic polymerization catalyst; and polymerizing at least one ethylenically unsaturated monomer in the presence of the surface-treated vulcanized rubber in a subdivided form to obtain at least one thermoplastic phase.
摘要:
A thermoplastic elastomeric material having: (a) 10% by weight to 100% by weight, preferably 20% by weight to 80% by weight, of at least one styrene-based thermoplastic elastomer, (b) 0% by weight to 90% by weight, preferably 20% by weight to 80% by weight, of at least one thermoplastic α-olefin homopolymer or copolymer different from (a), the amount of (a)+(b) being 100; (c) 2 parts by weight to 90 parts by weight, preferably 5 parts by weight to 40 parts by weight, of a vulcanized rubber in a subdivided form; (d) 0.01 part by weight to 10 parts by weight, preferably 0.05 part by weight to 5 parts by weight, of at least one coupling agent containing at least one ethylenic unsaturation, the amounts of (c) and (d) being expressed with respect to 100 parts by weight of (a)+(b). The thermoplastic elastomeric material shows improved mechanical properties, in particular, stress at break and elongation at break. Moreover, the thermoplastic elastomeric material shows improved abrasion resistance.
摘要:
A process for producing a rubber powder from a vulcanized rubber material by the steps of: a) feeding a grinding device with the vulcanized rubber material; b) contacting the vulcanized rubber material with at least one liquid coolant; c) introducing at least one grinding aid additive into the grinding device; d) operating the grinding device so as to grind the vulcanized rubber material to form a rubber powder, and e) discharging the rubber powder from the extruder.