The tire has at least one structural element including an elastomer compn. comprising: (a) at least one diene elastomeric polymer; (b) at least one quaternary ammonium salt which bears a nonionic N atom as a secondary vulcanization accelerator and (c) reinforcers (silica). Preferably, the structural element is a tire tread band. Thus, mixing 0.15 mol 1-bromodecane with 0.18 mol 1,4-diazabicyclo[2,2,2]octane in 400 mL tert-Bu Me ether at reflux for 21 h gave a quaternary ammonium salt (I). Kneading Buna 5025 (SBR) 90 with Europrene BR 40 (cis-1,4-butadiene rubber) 35, silica 70, X 50S [bis[3-(triethoxysilyl)propyl] tetrasulfide] 5.6, arom. oil 8 and microcryst. wax 2 in a 1st step, with ZnO 2.5 and an antioxidant 2 in a second step, then with I 2.8, Vulkacit CZ (vulcanization accelerator) 2 and S 1.2 parts in a third step gave a rubber compn. having good mech. properties
Tyre for vehicle wheels and elastomeric composition
GALIMBERTI, MAURIZIO STEFANO;CITTERIO, ATTILIO
2004-01-01
Abstract
The tire has at least one structural element including an elastomer compn. comprising: (a) at least one diene elastomeric polymer; (b) at least one quaternary ammonium salt which bears a nonionic N atom as a secondary vulcanization accelerator and (c) reinforcers (silica). Preferably, the structural element is a tire tread band. Thus, mixing 0.15 mol 1-bromodecane with 0.18 mol 1,4-diazabicyclo[2,2,2]octane in 400 mL tert-Bu Me ether at reflux for 21 h gave a quaternary ammonium salt (I). Kneading Buna 5025 (SBR) 90 with Europrene BR 40 (cis-1,4-butadiene rubber) 35, silica 70, X 50S [bis[3-(triethoxysilyl)propyl] tetrasulfide] 5.6, arom. oil 8 and microcryst. wax 2 in a 1st step, with ZnO 2.5 and an antioxidant 2 in a second step, then with I 2.8, Vulkacit CZ (vulcanization accelerator) 2 and S 1.2 parts in a third step gave a rubber compn. having good mech. propertiesI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
