Hydrogenated nitrile rubber composition
First Claim
1. A hydrogenated nitrile rubber composition for producing a cross-linked product having a 20% modulus of 10 MPa or more, which comprises 100 parts by weight of hydrogenated nitrile rubber having a bound acrylonitrile content of 44.2–
- 50% a median Mooney viscosity ML1+4 (100°
C.) of 75 or less and a median iodine value of 23 or less, and not less than 110 parts by weight in sum total as a filler comprising 30–
100 parts by weight of carbon black and 10–
80 parts by weight of graphite as a gas shielding filler, a volume fraction of the filler being 35–
74% on the basis of the composition said hydrogenated nitrile rubber composition being substantially impermeable to pressurized carbon dioxide so as to function as a carbon dioxide sealant material.
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Accused Products
Abstract
A hydrogenated nitrite rubber composition for providing a cross-linked product having a 20% modulus of 10 MPa or more and a thermal conductivity of 0.4 W/m·K or more at 25° C. The hydrogenated nitrile rubber composition includes 100 parts by weight of hydrogenated nitrile rubber having a bound acrylonitrile content of 40% or more, a polymer Mooney viscosity ML1+4 (100° C.) of 75 or less (median) as determined according to JIS K-6395, an iodine value of 23 or less (median), and at least 110 parts by weight in sum total of carbon black as a filler and other gas shielding filler. The hydrogenated nitrile rubber composition can effectively be used as a molding material for sliding applications or for a static sealing members for highly permeable gases. The hydrogenated nitrile rubber composition has a distinguishing carbon dioxide gas shieldability, heat resistance, and wear characteristics.
7 Citations
13 Claims
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1. A hydrogenated nitrile rubber composition for producing a cross-linked product having a 20% modulus of 10 MPa or more, which comprises 100 parts by weight of hydrogenated nitrile rubber having a bound acrylonitrile content of 44.2–
- 50% a median Mooney viscosity ML1+4 (100°
C.) of 75 or less and a median iodine value of 23 or less, and not less than 110 parts by weight in sum total as a filler comprising 30–
100 parts by weight of carbon black and 10–
80 parts by weight of graphite as a gas shielding filler, a volume fraction of the filler being 35–
74% on the basis of the composition said hydrogenated nitrile rubber composition being substantially impermeable to pressurized carbon dioxide so as to function as a carbon dioxide sealant material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- 50% a median Mooney viscosity ML1+4 (100°
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13. A process for producing a sealing member having a 20% modulus of 10 MPa of more, said process comprising the steps of:
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a) preparing a mixture comprising; 100 parts by weight of hydrogenated nitrile rubber having a bound aciylonitrile content of 44.2–
50%, a median Mooney viscosity ML1+4 (100°
C.) of 75 or less and a median iodine value of 23 or less;not less than 110 parts by weight in sum total as a filler comprising 30–
100 parts by weight of carbon black and 10–
80 parts by weight of graphite as a gas shielding filler, a volume fraction of the filler being 35–
74% on the basis of the mixture, anda crosslinking agent; b) crosslinking the mixture to obtain a crosslinked molding product; and
thenc) subjecting the crosslinked molding produce to contact with pressurized carbon dioxide.
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Specification
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- Resources
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Current AssigneeEagle Industry Company Limited
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Original AssigneeNOK Corporation
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InventorsYamanaka, Takuya, Tokumitsu, Hideyuki
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Primary Examiner(s)Szekely; Peter
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Application NumberUS10/493,506Publication NumberTime in Patent Office1,267 DaysField of Search524495-496, 524/565US Class Current524/565CPC Class CodesC08K 2201/008 Additives improving gas bar...C08K 3/04 CarbonC08K 7/06 ElementsC08L 15/005 Hydrogenated nitrile rubberF16J 15/102 characterised by materialF16J 15/3284 characterised by their stru...
