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US 9,868,806 B2Granted
Compositions that can be vulcanized and that are based on nitrile rubbers containing epoxy groups
AssigneeArlanxeo Deutschland GmbH
InventorsSven Brandau, Michael Klimpel, Hans Magg, Achim Welle
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Abstract
There are provided novel vulcanizable compositions based on optionally fully or partly hydrogenated nitrile rubbers containing epoxy groups, and specific crosslinkers, which no longer require use of conventional crosslinkers, more particularly sulphur. The vulcanizates producible therefrom possess very good compression sets at room temperature, 100° C. and 150° C., and additionally exhibit high tensile stress combined with good elongation at break.
Claims14
Vulcanizable composition comprising:
- (i) at least one optionally fully or partly hydrogenated nitrile rubber containing epoxy groups and comprising repeat units derived from at least one conjugated diene, at least one α,β-unsaturated nitrile, and optionally one or more further copolymerizable monomers, but not from a nonconjugated cyclic polyene;
- (ii) at least one Lewis base crosslinker selected from the group consisting of crown ethers, cryptands, triphenylphosphine, and bipyridine, and/or at least one Brønsted base crosslinker selected from the group consisting of calcium hydroxide, triethylamine, diisopropylamine, triethanolamine, 1,8-diazabicyclo undec-7-ene, 1,4-diazabicyclooctane, tetramethylethylenediamine, pyrrolidine, pyrazole, piperidine, pyrrole, imidazole, biuret, and sodium dodecylbenzylsulphonate;
- and
- wherein the composition comprises 0 to 2.5 parts by weight of crosslinkers (iii) other than those specified under (ii), based on 100 parts by weight of the optionally fully or partly hydrogenated nitrile rubber (i) containing epoxy groups.
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A vulcanizable composition comprising:
- (i) at least one optionally fully or partly hydrogenated nitrile rubber comprising epoxy groups and repeating units derived from at least one conjugated diene, at least one α,β-unsaturated nitrile, at least one monomer selected from the group consisting of 2- ethylglycidyl acrylate, 2-ethylglycidyl methacrylate, 2-(n-propyl)glycidyl acrylate, 2-(n- propyl)glycidyl methacrylate, 2-(n-butyl)glycidyl acrylate, 2-(n-butyl)glycidyl methacrylate, glycidyl methacrylate, glycidylmethyl methacrylate, glycidyl acrylate, (3′,4′-epoxyheptyl)-2-ethyl acrylate, (3′,4′-epoxyheptyl)-2-ethyl methacrylate, 6′,7′-epoxyheptyl acrylate, 6′,7′-epoxyheptyl methacrylate, allyl glycidyl ether, allyl 3,4-epoxyheptyl ether, 6,7-epoxyheptyl allyl ether, vinyl glycidyl ether, vinyl 3,4-epoxyheptyl ether, 3,4-epoxyheptyl vinyl ether, 6,7-epoxyheptyl vinyl ether, o-vinylbenzyl glycidyl ether, m-vinylbenzyl glycidyl ether, p-vinylbenzyl glycidyl ether, and 3-vinylcyclohexene oxide, and optionally one or more further copolymerizable monomers, but not from a nonconjugated cyclic polyene;
- (ii) at least one Lewis base crosslinker selected from the group consisting of crown ethers, cryptands, triphenylphosphine and bipyridine, and/or at least one Brønsted base crosslinker selected from the group consisting of calcium hydroxide, triethylamine, diisopropylamine, triethanolamine, 1,8-diazabicyclo undec-7-ene, 1,4- diazabicyclo octane, tetramethylethylenediamine, pyrrolidine, pyrazole, piperidine, pyrrole, imidazole, biuret, and sodium dodecylbenzylsulphonate;
- and
- (iii) crosslinkers other than those specified under (ii) in an amount of 0 to 2.5 parts by weight, based on 100 parts by weight of the optionally fully or partly hydrogenated nitrile rubber (i) containing epoxy groups.
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Dependencies are inferred from the claim text.