The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 22, 2013
Filed:
Jul. 23, 2009
Peter J. Wallen, Findlay, OH (US);
Gregory C. Bowman, Findlay, OH (US);
Howard A. Colvin, Brandon, FL (US);
Christopher J. Hardiman, Farmington, CT (US);
José Eduardo Rojas Reyna, Tamaulipas, MX;
Peter J. Wallen, Findlay, OH (US);
Gregory C. Bowman, Findlay, OH (US);
Howard A. Colvin, Brandon, FL (US);
Christopher J. Hardiman, Farmington, CT (US);
José Eduardo Rojas Reyna, Tamaulipas, MX;
Industrias Negromex, S.A. de C.V., Altamira, MX;
Cooper Tire & Rubber Company, Findlay, OH (US);
Abstract
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.