Industrias Negromex, S.a. De C.v.

Dynasol Elastomeros, S.a. De C.v.

Cdi Energy Products, Inc.

Xuan Fu

Christopher J Hardiman

Julian Maldonado Valenzuela

Robert J Scribner

Frederick Bligh Pippert

Sergio Alberto Moctezuma Espiricueto

Gabriel Hernández Zamora

Gabriela Elizabeth Blanco Reyes

John Kounavis

José María Islas Manzur

Gabriel Hernandez Zamora

Jose Maria Islas Manzur

The present invention provides a process for making a silica masterbatch that contains hydrophobated silica, solution-made rubber and emulsion-made rubber. Hydrophobated silica is mixed into a latex emulsion. Solution-rubber crumb in an aqueous suspension is mixed into the latex emulsion, which is coagulated, and a crumb is recovered, further homogenized, dried and baled to yield the silica masterbatch. A well-dispersed mixture of hydrophobated silica and emulsion-made rubber is added into a steam distillation step of a solution-rubber process from which a silica masterbatch is recovered. The emulsion-made rubber can be omitted to make a silica masterbatch of solution rubber and silica without emulsion rubber. The silica masterbatch has physical properties similar to those found in a comparable dry-mixed composition, but the silica masterbatch can be incorporated more easily and less expensively into tires and other rubber products than the dry-mixed composition.

Silica masterbatch made with emulsion and solution rubber

A process is provided for making a silica masterbatch, that contains silica and solution-made rubber. The silica masterbatch has physical properties similar to those found in a comparable dry-mixed composition, but the silica masterbatch can be incorporated more easily and less expensively into tires and other rubber products than the dry-mixed composition. A process is also provided for making a masterbatch of silica, a solution-made rubber and an emulsion-made rubber.

Processes for making masterbatches of rubber and silica

Disclosed are time controlled, hydrolytically degradable compositions that include a polyurethane; precipitated silica, carbon black, or a combination thereof; an organic acid adapted to facilitate degradation when the composition is contacted with water; a stabilizer; a first crosslinking agent; and an optional co-agent. The composition is adapted to degrade over a predetermined time period upon contact with water at a pH ranging from 5 to 8 and at a temperature ranging from 100&#xb0; F. to 250&#xb0; F.

Hydrolytically degradable composition

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Sugar Land, TX, United States of America

Xuan Fu