The B. F. Goodrich Company

Zeon Chemicals Usa, Inc.

Philip H Starmer

Charles C Raines

Tonson Abraham

August H Jorgensen, Jr

High amounts of silicon dioxide are readily incorporated into an emulsion polymerized elastomer by mixing an aqueous dispersion of silicon dioxide with a latex of the emulsion polymer and subsequently spray drying the mixture. Free flowing, fine-size (e.g., less than 500 micrometers) particles are produced with generally complete incorporation of silicon dioxide. The presence of the silicon dioxide permits rubbers with low gel and/or low Mooney viscosity to be spray dried whereas previously this could not be accomplished. Compared to conventional means of adding a silica to a bale rubber, the above powdered masterbatch gives shorter mixing times with lower power consumption with improved physical properties, such as tensile strength.

Free flowing particles of an emulsion polymer having SiO.sub.2

A random copolymer is formed by emulsion polymerization from two monomeric classes. The first monomeric class is a conjugated diene or substituted conjugated diene containing from four to about eight carbon atoms. The second monomeric class is of the general formula

Composition of and a method for preparing high-temperature oil-resistant

A preferred carboxylated nitrile rubber is prepared by polymerizing a diene, a nitrile and a small amount of an acrylic acid, which rubber has distributed therethrough an amount of alkyl or alkenyl monocitrate to obtain improved scorch time and reduced cure time.

Carboxylated rubber composition containing scorch inhibitor

Compositions comprised of a polymer blend of a halogen-containing polymer and a diene/nitrile rubber having active halogen cure sites are covulcanized using a common cure system. The halogen-containing polymers used in the polymer blend include the commercial polymers such as epihalohydrin polymers, polychloroprenes, fluoroelastomers, halogen-containing acrylates, and halogenated polyolefins. The curative ingredients employed are those normally used for the cure of the halogen-containing polymer employed in the polymer blend.

Vulcanizable compositions of a halogen-containing polymer and a

Compositions containing diene/nitrile polymers having active halogen sites are cured using zinc oxide and a thiourea compound to yield vulcanizates having excellent heat resistance.

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Avon Lake, OH, United States of America

Philip H Starmer