Molded rubber products and related compositions

Claim 2

A VULCANIZABLE COMPOSITION COMPRISING ABOUT 6-20 WEIGHT PERCENT OF A STYRENE-BUTADIENE COPOLYMER RUBBER CONTAINING 5-30 WEIGHT PERCENT STYRENE, ABOUT 50-80 WEIGHT PERCENT OF A FINELY DIVIDED INERT FILLER HAVING A PARTICLE SIZE BELOW ABOUT 80 MICRONS SELECTED FROM THE GROUP CONSISTING OF COAL, TALC AND HARD RUBBER DUST AND FROM ABOUT 2 TO ABOUT 8 WEIGHT PERCENT OF A RESIN OF A STYRENE BUTADIENE COPOLYMER CONTAINING ABOUT 70-90 WEIGHT PERCENT STYRENE AND HAVING A SOFTENING TEMPERATURE OF ABOUT 150*-250*F TO PROVIDE IN THE COMPOSITION WHEN CURED A TENSILE STRENGTH OF AT LEAST ABOUT 670 PSI AT ROOM TEMPERATURE AND AN IMPACT RESISTANCE OF AT LEAST ABOUT 3 INCHES (WITH A 2 LB. BALL) AT 0*F. AND BASED ON THE RUBBER ABOUT 30-70 WEIGHT PERCENT OF A PROCESSING OIL HAVING VISCOSITY OF ABOUT 40-180 SUS AT 210*F, ABOUT 40-100 WEIGHT PERCENT OF AN ACTIVATOR SELECTED FROM ALKALINE EARTH HYDROXIDES OR CARBONATES AND ABOUT 4-12 WEIGHT PERCENT SULFUR.

Claim 3

The composition of claim 1 wherein the resin is at least from about 6 to about 8 weight percent of the composition.

Claim 4

The composition of claim 2 wherein the resin is a styrene-butadiene copolymer with at least 70 percent of its units based on styrene and the processing oil is a non-aromatic oil with a high degree of saturation as measured by acidaffin content.

Claim 5

The composition of claim 3 wherein the processing oil has a miniumum of about 75 weight percent of components with saturation at least equivalent to second acidaffins and a maximum of about 8 weight percent nitrogen base components and 17 weight percent first acidaffins.

Claim 6

The composition fo claim 1 wherein the weights of the components are in the order of about 8-15 percent for rubber, about 50-80 percent for filler which is coal dust, about 30-70 percent for processing oil which is non-aromatic with a high degree of saturation as measured by acidaffin content, about 40-100 percent for lime as activator, about 4-12 percent for sulfur, and about 2-8 percent for resin which is a styrene- butadiene copolymer with about 70-90 percent of its units as styrene.

Claim 7

A thin-wall container with one or more inner compartments and having walls and partitions of uniform thicknesses not in excess of 0.200 in., the container being of a vulcanized rubber composition wherein the composition before vulcanization, comprises about 6-20 weight percent of a styrene-butadiene copolymer rubber containing 5-30 weight percent styrene, about 50-80 weight percent of a finely divided inert filler having a particle size below about 80 microns selected from the group consisting of coal, talc and hard rubber dust and from about 2 to about 8 weight percent of a resin of butadiene styrene copolymer containing about 70-90 weight percent styrene and having a softening temperature of about 150*-250*F to provide in the composition when cured a tensile strength of at least 670 psi at room temperature and an impact resistance of at least about 3 inches (with a 2 lb. ball) at 0*F and based upon the rubber, about 30-70 weight percent of a processing oil having a viscosity of about 40-180 SUS at 210*F, about 40-100 weight percent of an activator selected from alkaline earth hydroxides or carbonates and about 4-12 weight percent sulfur.

Claim 8

A thin-wall container with one or more inner compartments and having walls and partitions of uniform thicknesses not in excess of 0.200 in., the container being of a vulcanized rubber composition wherein the composition before vulcanization, comprises about 6-20 weight percent of a styrene-butadiene copolymer rubber containing 5-30 weight percent styrene, about 50-80 weight percent of a finely divided inert filler having a particle size below about 80 microns selected from the group consisting of coal, talc and hard rubber dust and from about 2 to about 8 weight percent of a resin of butadiene styrene copolymer containing about 70-90 weight percent styrene and having a softening temperature of about 150*-250*F to provide in the composition when cured a tensile strength of at least 670 psi at room temperature and an impact resistance of at least about 3 inches (with a 2 lb. ball) at 0*F and based upon the rubber, about 30-70 weight percent of a processing oil having a viscosity of about 40-180 SUS at 210*F, about 40-100 weight percent of an activator selected from alkaline earth hydroxides or carbonates and about 4-12 weight percent sulfur.

Claim 9

The container of claim 6 wherein the weights of the components in the uncured composition are in the order of about 8-15 percent for rubber, about 50-80 percent for filler which is coal dust, about 30-70 percent for processing oil which is non-aromatic with a high degree of saturation as measured by acidaffin content, about 40-100 percent for lime as activator, about 4-12 percent for sulfur, and about 6 to about 8 percent for resin which is a styrene-butadiene copolymer with about 70-90 percent of its units as styrene.

Claim 10

The container of claim 7 wherein the saturated processing oil is further characterized as having a minimum of about 75 weight percent of components with saturation at least equivalent to seconds acidaffins and a maximum of about 8 weight percent nitrogen base components and 17 weight percent first acidaffins; and the activator is lime.

Claim 11

The container of claim 8 wherein the activator is lime, and the styrene-butadiene copolymer has about 80-90 percent of its units as styrene.

Claim 12

The container of claim 9 wherein the rubber is a low styrene, butadiene rubber present in an amount of about 8-15 weight percent, the filler is coal dust in an amount of about 60-80 weight percent, and based on rubber, the processing oil is about 30-50 weight percent, the activator is about 60-100 weight percent, the sulfur is about 4-12 weight percent, and the resin is about 6 to about 8 weight percent.