	US 11,732,114 B2
	Rubber compound for tire portions
Gianpaolo Chieffi, Rome (IT); Aya Saiki, Rome (IT); and Davide Privitera, Rome (IT)
Assigned to Bridgestone Europe NV/SA, Zaventem (BE)
Appl. No. 17/277,444
Filed by BRIDGESTONE EUROPE NV/SA [BE/BE], Zaventem (BE)
PCT Filed Sep. 17, 2019, PCT No. PCT/EP2019/074845 § 371(c)(1), (2) Date Mar. 18, 2021, PCT Pub. No. WO2020/058259, PCT Pub. Date Mar. 26, 2020.
Claims priority of application No. 102018000008676 (IT), filed on Sep. 18, 2018.
Prior Publication US 2021/0347967 A1, Nov. 11, 2021
Int. Cl. C08L 9/00 (2006.01); B60C 1/00 (2006.01)

CPC C08L 9/00 (2013.01) [B60C 1/0016 (2013.01); C08L 2312/00 (2013.01)]

18 Claims

1. A rubber compound for the production of tire portions comprising:

a polymer base with a cross-linkable unsaturated chain;

a filler system including:

a quantity, greater than or equal to 25 phr, of a first carbon black having a surface area smaller than or equal to 170 m2/gr;

a quantity of a second carbon black having a surface area greater than or equal to 300 m2/gr, such that the ratio between the quantity of the first carbon black and the quantity of the second carbon black is greater than or equal to 5 and smaller than or equal to 13; and

a quantity ranging between 0.5 and 2.0 phr of a dispersant agent comprising an aromatic amide and having an unsaturation suited to interact with the polymer base with a cross-linkable unsaturated chain; and

a vulcanization system.