Rubber compounds for pneumatic tyres comprising recycled carbon black
A rubber compound for pneumatic tyres comprising a cross-linkable unsaturated-chain polymer base, carbon black, a silane bonding agent and a vulcanization system. Part of the carbon black is carbon black from pyrolysis having a surface functionalization deriving from a treatment with an aminoacidic compound comprising at least one thiol group or a disulfide group.
1. Rubber compound for pneumatic tyres consisting of a cross-linkable unsaturated-chain polymer base, carbon black, wherein a part of said carbon black is recycled carbon black having a surface functionalization, a silane bonding agent, a vulcanization system, and optionally an antioxidant;
said compound being characterized in that said recycled carbon black is obtained from the pyrolysis of used pneumatic tyres, and wherein said recycled carbon black has a surface functionalization derived from treatment of the recycled carbon black with an aminoacidic compound comprising at least one thiol group or a disulfide group, and said recycled carbon black has surface functionalization of between 5 and 15% by weight.
2. Rubber compound for pneumatic tyres according to claim 1 , characterized in that the aminoacidic compound is HSCH 2 CHNH 2 COOH or (SCH 2 CHNH 2 COOH) 2 .
3. Rubber compound for pneumatic tyres according to claim 1 , characterized in that said recycled carbon black is present in the compound in a quantity of between 2 and 25% in phr of the total carbon black.
4. Portion of pneumatic tyre made with the rubber compound according to claim 1 .
5. Portion of pneumatic tyre according to claim 4 , characterized in that it is a portion of the casing of the pneumatic tyre.