08357733 is referenced by 9 patents and cites 47 patents.

The present invention provides a process for making silica-filled rubber masterbatch using silica hydrophobated with a trimethoxy silane coupling agent that is soluble in an alcohol-water solution containing at least about 70 wt % water. One embodiment uses a mixture of trimethoxy silanes, one or more of which react with rubber to bond the silica to the rubber, and one or more of which do not react with rubber, but do hydrophobate the silica. Hydrophobated silica is mixed with latex polymer and incorporated into rubber during coagulation of the latex, which is preferably coagulated with calcium chloride. The present invention further provides a process for making the trimethoxy silane coupling agents. Preferred trimethoxy silane coupling agents include bis-(3-trimethoxysilylpropyl)-disulfide and bis-(3-trimethoxysilylpropyl)-tetrasulfide. Rubber products, particularly tires, compounded with the inventive silica masterbatch can be processed for a long time before scorching because the silica masterbatch provides a long scorch time.

Title
Processes for making silane, hydrophobated silica, silica masterbatch and rubber products
Application Number
12/460765
Publication Number
8357733 (B2)
Application Date
July 23, 2009
Publication Date
January 22, 2013
Inventor
José Eduardo Rojas Reyna
Tamaulipas
MX
Christopher J Hardiman
Farmington
CT, US
Howard A Colvin
Brandon
FL, US
Gregory C Bowman
Findlay
OH, US
Peter J Wallen
Findlay
OH, US
Agent
Stephen S Hodgson
Assignee
Cooper Tire & Rubber Company
OH, US
Industrias Negromex de C V
MX
IPC
C08K 9/06
C08K 3/36
View Original Source