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:
Jun. 17, 2003
Filed:
Oct. 30, 2001
William L. Hergenrother, Akron, OH (US);
Christine M. Rademacher, Akron, OH (US);
James D. Ulmer, Akron, OH (US);
Bridgestone Corporation, Tokyo, JP;
Abstract
A vulcanized elastomeric composition of matter comprises the reaction product of a sulfur-containing reagent with an anionic living polymer, the reagent being selected from the group consisting of R —Si—S—R′—X, where R can all be the same or different and is selected from the group consisting of alkyls having from 1 to 8 carbon atoms, cycloalkyls having from 3 to 11 carbon atoms, or an arylene having from 6 to 14 carbon atoms, and X is a halogen, to form a R —Si—S—R′ ended polymer; a filler; processing oil; and a cure package containing a deprotecting agent and at least one sulfur cure accelerator. A method for making a vulcanized elastomeric composition of matter comprises terminating a living anionic polymer with a sulfur-containing reagent selected from the group consisting of R —Si—S—R′—X, where R can all be the same or different and is selected from the group consisting of alkyls having from 1 to 8 carbon atoms, cycloalkyls having from 3 to 11 carbon atoms, or aryls having from 6 to 14 carbon atoms, R′ is an alkylene having from 1 to 8 carbon atoms, a cycloalkylene having from 3 to 11 carbon atoms, or an arylene having from 6 to 14 carbon atoms, and X is a halogen, to form a R —Si—S—R′ polymer having a protected mercapto group; deprotecting the mercapto group prior to or during vulcanization of the composition, and attaching the mercapto group to a polymer backbone of one of the polymers. A method is also provided for reducing hysteresis and the invention provides improved pneumatic tires.