Heavy duty conveyor belts having excellent resistance to high temperatures. These conveyor belts can be repeatedly exposed to temperatures of greater than 150? C. or even greater than 200? C. without compromising the strength or reliability of the belt while providing a greatly extended service life. The conveyor belts generally include a reinforcement layer, a carry cover layer disposed above the reinforcement layer, a pulley cover layer disposed beneath the reinforcement layer. The carry cover layer contains a high temperature resistant compound based upon a peroxide curable rubber mixture of ethylene propylene copolymer with ethylene based polyolefin elastomer, and in some aspects, further includes a combination of diphenylamine (DPA), zinc 2-mercaptomethyl benzimidazole (ZMTI), and 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ), and additionally, any other suitable additives.

A conveyor belt obtained by bonding together conveyor belts to be adhered using an adhesive rubber is provided. The conveyor belts to be adhered include a rubber composition containing an ethylene--olefin copolymer, an organic peroxide (X1), and carbon black (Y1), the organic peroxide (X1) being contained in an amount of from 0.011 to 0.020 molar equivalents relative to the ethylene--olefin copolymer in the conveyor belts to be adhered. The adhesive rubber includes a rubber composition containing an ethylene--olefin copolymer, an organic peroxide (X2), and carbon black (Y2), the organic peroxide (X2) being contained in an amount of from 0.017 to 0.022 molar equivalents relative to the ethylene--olefin copolymer in the adhesive rubber. A content ratio (X2/X1) of the organic peroxide (X2) to the organic peroxide (X1) is from 1.20 to 2.00.

A conveyor belt obtained by bonding together conveyor belts to be adhered using an adhesive rubber is provided. The conveyor belts to be adhered include a rubber composition containing an ethylene--olefin copolymer, an organic peroxide (X1), and carbon black (Y1), the organic peroxide (X1) being contained in an amount of from 0.011 to 0.020 molar equivalents relative to the ethylene--olefin copolymer in the conveyor belts to be adhered. The adhesive rubber includes a rubber composition containing an ethylene--olefin copolymer, an organic peroxide (X2), and carbon black (Y2), the organic peroxide (X2) being contained in an amount of from 0.017 to 0.022 molar equivalents relative to the ethylene--olefin copolymer in the adhesive rubber. A content ratio (X2/X1) of the organic peroxide (X2) to the organic peroxide (X1) is from 1.20 to 2.00.

Heavy duty conveyor belts (1) having excellent resistance to high temperatures. These conveyor belts (1) can be repeatedly exposed to temperatures of greater than 200 C. or even 250 C. without compromising the strength or reliability of the belt while providing a greatly extended service life. The conveyor belts (1) may also be manufactured in a commercially viable and cost effective manner. The conveyor belts (1) generally include a reinforcement layer (3), a carry cover layer (2) disposed above the reinforcement layer (3), a pulley cover layer (4) disposed beneath the reinforcement layer (3), and the carry cover layer (2) is comprised of a fluoroelastomer. In some aspects, the conveyor belts (1) have a carry cover layer (2) which includes an outer surface layer (6) containing a fluoroelastomer and an inner layer (7) based upon an EPM elastomer or an EPDM elastomer.

Heavy duty conveyor belts (1) having excellent resistance to high temperatures. These conveyor belts (1) can be repeatedly exposed to temperatures of greater than 200 C. or even 250 C. without compromising the strength or reliability of the belt while providing a greatly extended service life. The conveyor belts (1) may also be manufactured in a commercially viable and cost effective manner. The conveyor belts (1) generally include a reinforcement layer (3), a carry cover layer (2) disposed above the reinforcement layer (3), a pulley cover layer (4) disposed beneath the reinforcement layer (3), and the carry cover layer (2) is comprised of a fluoroelastomer. In some aspects, the conveyor belts (1) have a carry cover layer (2) which includes an outer surface layer (6) containing a fluoroelastomer and an inner layer (7) based upon an EPM elastomer or an EPDM elastomer.

A conveyor belt obtained by bonding together conveyor belts to be adhered using an adhesive rubber is provided. The conveyor belts to be adhered include a rubber composition containing an ethylene--olefin copolymer, an organic peroxide (X1), and carbon black (Y1), the organic peroxide (X1) being contained in an amount of from 0.011 to 0.020 molar equivalents relative to the ethylene--olefin copolymer in the conveyor belts to be adhered. The adhesive rubber includes a rubber composition containing an ethylene--olefin copolymer, an organic peroxide (X2), and carbon black (Y2), the organic peroxide (X2) being contained in an amount of from 0.017 to 0.022 molar equivalents relative to the ethylene--olefin copolymer in the adhesive rubber. A content ratio (X2/X1) of the organic peroxide (X2) to the organic peroxide (X1) is from 1.20 to 2.00.

Rubber blends of SBR and EPDM having improved dynamic ozone resistance, heat resistance, and flex fatigue resistance can be made by co-curing such rubber blends with a sulfur donor/accelerator and a peroxide curing agent. In some aspects, these blends are void of free sulfur. These cured rubber formulations can advantageously be used in a wide variety of industrial rubber products, such as in conveyor belts. The disclosure also reveals conveyor belts which have a combination of good dynamic ozone resistance, heat resistance, and flex fatigue resistance. The conveyor belt include a carry cover layer, a pulley cover layer, and a reinforcement layer which is situated between the carry cover layer and the pulley cover layer, and the carry cover layer and/or the pulley cover layer contain cured rubber formulations according to the disclosure.

Rubber blends of SBR and EPDM having improved dynamic ozone resistance, heat resistance, and flex fatigue resistance can be made by co-curing such rubber blends with a sulfur donor/accelerator and a peroxide curing agent. In some aspects, these blends are void of free sulfur. These cured rubber formulations can advantageously be used in a wide variety of industrial rubber products, such as in conveyor belts. The disclosure also reveals conveyor belts which have a combination of good dynamic ozone resistance, heat resistance, and flex fatigue resistance. The conveyor belt include a carry cover layer, a pulley cover layer, and a reinforcement layer which is situated between the carry cover layer and the pulley cover layer, and the carry cover layer and/or the pulley cover layer contain cured rubber formulations according to the disclosure.

A rubber composition for heat-resistant conveyor belts contains an ethylene-1-butene copolymer having a Mooney viscosity at 125 C. of 20 or greater, and an ethylene-propylene copolymer having a Mooney viscosity at 125 C. of 20 or greater and an ethylene content of 40 to 60 mass %, and the mass ratio of the ethylene-1-butene copolymer to the ethylene-propylene copolymer is 10/90 to 90/10.

A method for adhering together rubbers to be adhered including a rubber composition containing an ethylene--olefin copolymer, an organic peroxide (X1), and carbon black (Y1), using a rubber for adhesion including a rubber composition containing an ethylene--olefin copolymer, an organic peroxide (X2), and carbon black (Y2) at an adhesive interface, wherein contents of the organic peroxide (X1) in the rubber to be adhered and the organic peroxide (X2) in the rubber for adhesion are predetermined contents, and a content ratio (X2/X1) of the organic peroxide (X2) to the organic peroxide (X1) is from 1.20 to 2.00.