Highly saturated nitrile copolymer rubber, process for the production thereof, heat-resistant rubber compositions comprising the rubber and composites comprising the rubber and fibers
First Claim
1. A highly saturated nitrile group-containing copolymer rubber having a Mooney viscosity lowered by 15 points or more by applying a shearing force at a shearing rate of from 500 to 5,000 S−
- 1 thereto in the presence of 1 to 10 parts by weight, based on 100 parts by weight of the highly saturated nitrile group-containing copolymer rubber, of an aging inhibitor at a temperature of from 180°
C. to 380°
C., which has a Mooney viscosity of from 5 to 135 and a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) of 3 to 5, and exhibits an increase in Mooney viscosity of 10 points or fewer while the rubber is allowed to stand in the air at room temperature for 30 days after the above-lowering of Mooney viscosity, said copolymer rubber being a hydrogenation product of a copolymer comprising ethylenically unsaturated nitrile monomer units, diene monomer units and optional copolymerizable monomer units wherein the content of the ethylenically unsaturated nitrile monomer units in the copolymer is in the range of 10 to 60% by weight, said copolymer rubber having an iodine value of not larger than 120 as measured before applying the high shearing force, and said aging inhibitor being at least one member selected from the group consisting of aromatic secondary amine-containing, amine-ketone-containing, mercaptobenzoimidazole-containing, bisphenol-containing, monophenol-containing, thiobisphenol-containing, hydroquinone-containing, nickel salt-containing, thiourea-containing, thioether-containing and phosphorus-containing aging inhibitors.
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Abstract
A highly saturated nitrile group-containing copolymer rubber having a Mooney viscosity lowered by 15 points or more by applying a high shearing force thereto in the presence of an aging inhibitor, which has a Mooney viscosity of 5-35 and a weight average molecular weight/number average molecular weight ratio of 3-5, and exhibits an increase in Mooney viscosity of 10 points or fewer while the rubber is allowed to stand in the air at room temperature for 30 days. The viscosity of the copolymer rubber changes only to a minor extent with the lapse of time, and the copolymer rubber has excellent processability and storage stability. The copolymer rubber can be used as a heat-resistant rubber composition comprising the copolymer rubber and other heat-resistant rubber. The copolymer rubber can be used as a composite thereof with a fiber, which has good mechanical strength.
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Citations
14 Claims
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1. A highly saturated nitrile group-containing copolymer rubber having a Mooney viscosity lowered by 15 points or more by applying a shearing force at a shearing rate of from 500 to 5,000 S−
- 1 thereto in the presence of 1 to 10 parts by weight, based on 100 parts by weight of the highly saturated nitrile group-containing copolymer rubber, of an aging inhibitor at a temperature of from 180°
C. to 380°
C., which has a Mooney viscosity of from 5 to 135 and a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) of 3 to 5, and exhibits an increase in Mooney viscosity of 10 points or fewer while the rubber is allowed to stand in the air at room temperature for 30 days after the above-lowering of Mooney viscosity, said copolymer rubber being a hydrogenation product of a copolymer comprising ethylenically unsaturated nitrile monomer units, diene monomer units and optional copolymerizable monomer units wherein the content of the ethylenically unsaturated nitrile monomer units in the copolymer is in the range of 10 to 60% by weight, said copolymer rubber having an iodine value of not larger than 120 as measured before applying the high shearing force, and said aging inhibitor being at least one member selected from the group consisting of aromatic secondary amine-containing, amine-ketone-containing, mercaptobenzoimidazole-containing, bisphenol-containing, monophenol-containing, thiobisphenol-containing, hydroquinone-containing, nickel salt-containing, thiourea-containing, thioether-containing and phosphorus-containing aging inhibitors. - View Dependent Claims (2, 3, 11, 12, 13, 14)
- 1 thereto in the presence of 1 to 10 parts by weight, based on 100 parts by weight of the highly saturated nitrile group-containing copolymer rubber, of an aging inhibitor at a temperature of from 180°
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4. A process for producing a highly saturated nitrile group-containing copolymer rubber having a low Mooney viscosity, wherein a shearing force at a shearing rate of from 500 to 5,000 S−
- 1 is applied to a highly saturated nitrile group-containing copolymer rubber having an iodine value of not larger than 120 to lower the Mooney viscosity thereof, said copolymer rubber being a hydrogenation product of a copolymer comprising ethylenically unsaturated nitrile monomer units, diene monomer units and optional copolymerizable monomer units wherein the content of the ethylenically unsaturated nitrile monomer units in the copolymer is in the range of 10 to 60% by weight, characterized in that the application of shearing force is carried out in the presence of 1 to 10 parts by weight, based on 100 parts by weight of the highly saturated nitrile group-containing copolymer rubber, of an aging inhibitor at a temperature of from 180°
C. to 380°
C., wherein said aging inhibitor is at least one member selected from the group consisting of aromatic secondary amine-containing, amine-ketone-containing, mercaptobenzoimidazole-containing, bisphenol-containing, monophenol-containing, thiobisphenol-containing, hydroquinone-containing, nickel salt-containing, thiourea-containing, thioether-containing and phosphorus-containing aging inhibitors. - View Dependent Claims (5, 6, 7, 8, 9, 10)
- 1 is applied to a highly saturated nitrile group-containing copolymer rubber having an iodine value of not larger than 120 to lower the Mooney viscosity thereof, said copolymer rubber being a hydrogenation product of a copolymer comprising ethylenically unsaturated nitrile monomer units, diene monomer units and optional copolymerizable monomer units wherein the content of the ethylenically unsaturated nitrile monomer units in the copolymer is in the range of 10 to 60% by weight, characterized in that the application of shearing force is carried out in the presence of 1 to 10 parts by weight, based on 100 parts by weight of the highly saturated nitrile group-containing copolymer rubber, of an aging inhibitor at a temperature of from 180°
Specification