The Goodyear & Tire Rubber Company

John Eugene Varner

Paul Harry Sandstrom

Lawson G Wideman

Edward John Blok

Giorgio Agostini

Bruce Raymond Hahn

Richard Michael D'Sidocky

Georges Marcel Victor Thielen

Frank Schmitz

Denise Jeannette Keith

Joseph Alan Incavo

Carl Trevor Ross Pulford

Xiaoping Yang

Byoung Jo Lee

Bernard Matthew Bezilla, Jr

Larry Ashley Gordon

Douglas Blair Dotts

Rebecca Lee Dando

Jeremy Elton Miracle

Cigdem Gurer

James Edward Taucher

Jennifer Elizabeth Wall

Donald Ray Lay

Terry Lee Rose

John Richard Campanelli

Leslie Allen Haller

Isabelle Lea Louise Marie Lambert

Nicola Costantini

The invention relates to a cured rubber composition, its preparation and a tire with a component of such rubber composition. A reinforcing resin is used to promote stiffness for the cured rubber composition. The elastomer for the rubber composition is primarily comprised of at least one isoprene-containing elastomer.

Rubber composition, preparation and tire with component

The present invention relates to a pneumatic tire with a built-in sealant layer comprised of a depolymerized butyl rubber based sealant precursor. The butyl rubber of the built-in sealant precursor composition is depolymerized in situ within the tire with an activated free radical generating organoperoxide. The organoperoxide is activated with a 2,2,6,6-tetra alkyl piperidine hindered amine. Representative of such hindered amines are, for example, a poly[[6-[1,1,3,3,-tetramethylbutyl)amino]-s-triazine-2,4-diyl][2,2,6,6,-tetramethyl-4-piperidyl)imino]hexamethylene[(2,2,6,6-tetramethyl-4-piperidyl)imino]] compound. The sealant layer, if desired, may be of a color which contrasts with black. For such purpose the sealant layer may contain a colorant of a non-black color to a substantial exclusion of carbon black. The butyl rubber-based sealant precursor is built into the tire as a layer to form a tire assembly wherein the butyl rubber-based composite portion of the sealant precursor layer is at least partially depolymerized by a said activated organoperoxide during a subsequent curing of the tire at an elevated temperature in a suitable mold to form the tire having the resultant built-in sealant layer. The sealant composition may additionally contain conventional clay, exfoliated intercalated clay platelets and/or calcium carbonate.

Pneumatic tire with depolymerized butyl rubber-based built-in sealant prepared with activated organoperoxide

The present invention relates to a pneumatic tire having a rubber component comprised of

Pneumatic tire having a rubber component containing N, N'-(m-phenylene) bismaleamic acid

The invention relates to preparation of silica-rich rubber compositions by a sequence of sequential mixing steps conducted in internal rubber mixer(s) with individual maximum temperature limitations. The mixing steps are comprised of at least two non-productive mixing steps followed by a productive mixing step. The non-productive mixing steps themselves are comprised of at least one preliminary non-productive mixing step followed by a final non-productive mixing step. Elastomer, silica and coupling agent are added in at least one of said preliminary non-productive mixing steps to the exclusion of said final non-productive mixing step and said productive mixing step. Sulfur and sulfur vulcanization accelerator(s) are added in said productive mixing step to the exclusion of said non-productive mixing steps. The preliminary non-productive mixing step(s) are individually conducted to a maximum mixing temperature in a range of from about 150&#xb0; C. to about 180&#xb0; followed by the final non-productive mixing step to a reduced maximum mixing temperature in a range of from about 90&#xb0; C. to about 130&#xb0; C. The maximum mixing temperature of said final non-productive mixing step is at least 20&#xb0; C. lower than the maximum temperature for said preliminary non-productive mixing stage(s). The productive mixing step is conducted to a maximum temperature in a range of from about 90&#xb0; C. to about 120&#xb0; C. The rubber composition is removed from its respective internal rubber mixer and cooled to below 40&#xb0; C. between said mixing steps. The invention is further intended to relate to a rubber composition prepared by such mixing process and to a tire having at least one component comprised of such rubber composition.

Preparation of silica-rich rubber composition by sequential mixing with maximum mixing temperature limitations

A method for evaluating and controlling a mixing process for polymer-based compounds includes the steps: obtaining initial starting conditions and values for viscosity dependent parameters; increasing batch temperature by a differential amount; calculating mixing parameters such as batch temperature, dispersion, viscosity, and torque based upon fundamental kinetic, thermodynamic, and theological models; determining whether an endpoint or end points of one or more mixing parameters has been achieved; and changing one or more conditions so as to achieve the desired endpoint(s).

Method for evaluating and controlling a mixing process

The invention relates to a rubber composition which contains a tris (maleamic acid derivative)amine as an anti-reversion additive. The invention also relates to a tire having a component of such rubber composition.

Rubber composition which contains anti-reversion material and tire with

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Barberton, OH, United States of America

John Eugene Varner