	US 12,104,038 B2
	Silica reinforced rubber
George Jim Papakonstantopoulos, Medina, OH (US); Brad Stephen Gulas, Fairlawn, OH (US); and Bruce Raymond Hahn, Hudson, OH (US)
Assigned to The Goodyear Tire & Rubber Company, Akron, OH (US)
Filed by THE GOODYEAR TIRE & RUBBER COMPANY, Akron, OH (US)
Filed on Dec. 9, 2021, as Appl. No. 17/546,256.
Claims priority of provisional application 63/154,272, filed on Feb. 26, 2021.
Claims priority of provisional application 63/131,842, filed on Dec. 30, 2020.
Prior Publication US 2022/0204722 A1, Jun. 30, 2022
Int. Cl. C08K 3/06 (2006.01); B60C 1/00 (2006.01); C08K 3/36 (2006.01); C08K 5/54 (2006.01); C08K 5/548 (2006.01); C08K 9/06 (2006.01); C08L 9/06 (2006.01)

CPC C08K 3/06 (2013.01) [B60C 1/0016 (2013.01); C08K 3/36 (2013.01); C08K 5/5403 (2013.01); C08K 5/548 (2013.01); C08K 9/06 (2013.01); C08L 9/06 (2013.01)]

20 Claims

1. A sulfur curable rubber formulation which is comprised of (1) at least one rubbery polymer, (2) sulfur, (3) 50 to 150 phr of pre-reacted silica, and (4) 2 phr to 10 phr of carbon black, wherein the pre-reacted silica is comprised of a silica which is pre-reacted with (a) a hydrophobating silane, and (b) a crosslinkable silane, wherein the crosslinkable silane is of the structural formula: HS—(CH₂)_n—Si—[(O—(CH₂)_mCH₃)]₃, wherein n represents an integer from 1 to 6, wherein m represents an integer from 0 to 6, wherein the weight ratio of the hydrophobating silane to the crosslinkable silane is within the range of about 2:1 to about 20:1, wherein the total weight of the hydrophobating silane and the crosslinkable silane is within the range of 2.5 phf to 15 phf, wherein the level of hydrophobating silica is within the range of 2 phf to 12 phf, wherein the level of the crosslinkable silane is within the range of 0.5 phf to 3 phf, and wherein the sulfur curable rubber formulation is void of titanium compounds.