Process for hydrogenating carboxylated nitrile rubber, the hydrogenated rubber and its uses
AssigneeLANXESS Corporation
InventorsSharon X. Guo, Harald Bender
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Abstract
Polymers of a conjugated diene, an unsaturated nitrile and an α,β-unsaturated carboxylic acid are selectively hydrogenated to reduce carbon-carbon double bonds, without also reducing carboxyl groups and nitrile groups, using a rhodium-containing compound as catalyst. The hydrogenated polymers are novel and display excellent adhesive properties at both room temperature and high temperature, excellent hot tear strength, and excellent abrasion resistance.
Claims33
A process for selectively hydrogenating a polymer of a conjugated diene, an unsaturated nitrile and an unsaturated carboxylic acid, which comprises subjecting the polymer to hydrogenation in the presence of a rhodium-containing compound as catalyst and a co-catalyst ligand, wherein the weight ratio of the rhodium-containing compound to the co-catalyst ligand is from 1:3 to 1:55.
A statistical polymer of a conjugated diene, an unsaturated nitrile and an unsaturated carboxylic acid, wherein at least 80% of carbon-carbon double bonds in the polymer backbone have been selectively hydrogenated without concomitant hydrogenation of nitrile groups or carboxyl groups.
A polymer according to claim 21, 22 or 223 which has a molecular weight greater than 100,000.
Dependencies are inferred from the claim text.