Momentive Performance Materials Gmbh

Continental Aktiengesellschaft

Continental Reifen Deutschland Gmbh

William Michael York

Carla Recker

Katharina Herzog

Richard W Cruse

Thomas Kramer

Robert James Perry

Michael Joseph O'Brien

Boris Mergell

Eric Raymond Pohl

Norbert Mueller

Lesley Hwang

Juergen Wagemann

Hajo Weinreich

Jürgen Wagemann

Isabel Christin Albers

Adeyemi Adedayo Adepetun

Viktoriya Tkachenko

A silane based additive, rubber formulations including the additive and tires having tread portions made with the additive, together with methods of forming those products, are provided. Uncured rubber formulations in accordance with preferred embodiments of the invention comprise (1) a rubbery primary polymer or polymer blend, such as natural rubber and/or synthetic rubber; (2) reinforcing silica filler; (3) a network forming monomer or polymer, especially a thermosetting network forming moiety, for forming a secondary polymeric network; and (4) a silane containing one or more moieties of the aforementioned network forming polymer. In particular networks which can be generated in-situ are preferred. The cured rubber formulation should comprise the silica, having the secondary polymer network coupled thereto, within the rubber matrix, and not directly to the rubber chains via sulfidic linkages.

Polymer network forming silane compositions

A particulate-filled rubber composition contains at least one silane-reactive particulate filler and a mixture of at least one blocked mercaptosilane coupling agent possessing two thioacyl groups and at least one blocked mercaptosilane possessing a single thioacyl group.

Rubber composition containing blocked mercaptosilanes and articles made therefrom

A sulfur-containing cycloaliphatic compound, useful as a crosslinker for filled sulfur-vulcanizable elastomer compositions, is represented by the general formula:G[-CH&#x2014;S[C(&#x2550;O)]R]wherein G is selected from the group consisting of:

Sulfur-containing cycloaliphatic compound, filled sulfur-vulcanizable elastomer composition containing sulfur-containing cycloaliphatic compound and articles fabricated therefrom

A crosslinked polysulfide-containing cycloaliphatic compound, useful as a crosslinker for filled sulfur-vulcanizable elastomer compositions, is represented by the general formula:[(CH-)G(-CHS&#x2014;)][CH-G-CHS&#x2014;][R]wherein Gis a saturated, monocyclic aliphatic group of valence n containing from 5 to 12 carbon atoms and optionally containing at least one halogen or a saturated monocyclic silicone [RSiO&#x2014;][RSiO&#x2014;]group of valence n; Gis a saturated, divalent cyclic aliphatic group of valence 2 containing from 5 to 12 carbon atoms and optionally containing at least one halogen or a saturated monocyclic silicone [RSiO&#x2014;][RSiO&#x2014;]group of valence n; each R independently is a selected from the group consisting of a hydrogen atom, monovalent hydrocarbon of up to 20 carbon atoms and a halogen atom; each occurrence of subscripts a, b, c, d, m, n, o, p, q, x and y independently is an integer wherein a is 2 to 6; b is 2 to 6; c is 1 to 6; d is 1 to 6; m is 1 or 2; n is 3 to 5; o is a positive integer, p is 0 or a positive integer; q is a positive integer; r is an integer of from 0 to 3; x is 1 to 10 and y is 1 to 10, with the provisos that,

Crosslinked polysulfide-containing cycloaliphatic compound, process for its preparation, filled sulfur-vulcanizable elastomer composition containing same and articles fabricated therefrom

A sulfur-containing cycloaliphatic compound, useful as a crosslinker for filled sulfur-vulcanizable elastomer compositions, is represented by the general formula:G[&#x2014;CH&#x2014;S&#x2014;S(&#x2550;O)&#x2014;R]wherein G is a saturated, monocyclic aliphatic group of valence n containing from 5 to 12 carbon atoms and optionally containing at least one halogen or a saturated monocyclic silicone [RSiO&#x2014;][RSiO&#x2014;]group of valence n; each R independently is a monovalent hydrocarbon of up to 20 carbon atoms; each occurrence of subscripts a and b independently is an integer wherein a is 2 to 6 and b is 1 or 2; n is an integer of from 3 to 6; and p is an integer of from 0 to 3.

Sulfur-containing cycloaliphatic compound, process for its preparation, filled sulfur-vulcanizable elastomer composition containing same and articles fabricated therefrom

A rubber mixture with improved abrasion with improved abrasion performance, in particular for pneumatic tires, has the following composition: from 30 to 100 phr of at least one diene rubber; from 0.1 to 10 phr of at least one vulcanization accelerator selected from the group consisting of: thiazole accelerators, mercapto accelerators, sulfenamide accelerators, guanidine accelerators, thiuram accelerators, dithiocarbamate accelerators, amine accelerators, thioureas, and/or other accelerators; and a vulcanization system of sulfur comprising elemental sulfur, sulfur donor and silane between 0.25 and 0.08 moles per 100 parts by weight of the rubber elastometer, whereby the free sulfur contributes in the range of 0 to 70%, the sulfur donor contributes in the range of 5 to 30%, and the silane contributes in the range of 20 to 95%.

Rubber mixture with improved abrasion

A tire composition with a Shore A hardness, according to DIN 53 505 and ASTM D2240, of not less than 40 and not greater than 95 and a glass-transition temperature T(E&#x2033;max), according to DIN 53 513 with a specified temperature sweep of &#x2212;80&#xb0; C. to +80&#xb0; C. and a specified compression of 10+0.2% at 10 Hz, not less than &#x2212;80&#xb0; C. and not greater than 0&#xb0; C., with improved abrasion performance, in particular for pneumatic tires, has the following composition:

Tire composition with improved vulcanizing agent

A tire composition is provided that may include a sulfur-functional linear polyorganosiloxane and an unsaturated elastomer. The sulfur-functional linear polyorganosiloxane may include a chemically protected sulfur group, which includes a thiocarbamate, a dithiocarbamate, or a derivative or analog of thiocarbamate or dithiocarbamate. Under certain conditions, the sulfur group may react with the unsaturated elastomer. The invention includes embodiments that may relate to methods of making and using the sulfur-functional linear polyorganosiloxane in tire compositions.

Polyorganosiloxane composition for use in unsaturated elastomer, article made therefrom, and associated method

A thiocarbamoyldisulfanyl-functional cycloaliphatic compound, useful as a crosslinker for filled sulfur-vulcanizable elastomer compositions, is represented by the general formula:G[-CH&#x2014;S&#x2014;S&#x2014;C(&#x2550;S)NR]wherein G is a saturated, monocyclic aliphatic group of valence n containing from 5 to 12 carbon atoms and optionally containing at least one halogen or a saturated monocyclic silicone [RSiO&#x2014;][RSiO&#x2014;]group of valence n; each R independently is a hydrogen or a monovalent hydrocarbon of up to 20 carbon atoms; each occurrence of subscripts a independently is an integer wherein a is 2 to 6; n is an integer of from 3 to 6; and, p is an integer of from 0 to 3.

Thiocarbamoyldisufanyl-functional cycloaliphatic compound, process for its preparation, filled sulfur-vulcanizable elastomer composition containing same and articles fabricated therefrom

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Concord, NC, United States of America

William Michael York