Butyl compositions comprising nitrile polymers
The present invention relates to a polymer composite containing at least one carboxylated nitrile rubber polymer, that is optionally hydrogenated, and at least halogenated butyl rubber, a process for preparing said polymer composite wherein at least one carboxylated nitrile rubber polymer, that is optionally hydrogenated, and at least one halogenated butyl rubber are mixed and a shaped article containing at least one carboxylated nitrile rubber polymer, that is optionally hydrogenated, and at least one halogenated butyl rubber, as well as a method of increasing the cross-linking density of a halogenated butyl rubber by admixing said halogenated butyl rubber with at least one, optionally hydrogenated, carboxylated nitrile rubber polymer, optionally at least on cross-linking agent, and optionally a filler and curing the compound.
1 . A polymer composite comprising at least one, optionally hydrogenated, carboxylated nitrile rubber polymer, and at least halogenated butyl rubber.
2 . A composite according to claim 1 , wherein the carboxylated nitrile rubber polymer is a hydrogenated carboxylated nitrile rubber.
3 . A composite according to claim 1 , wherein the halogenated butyl rubber is a brominated butyl rubber.
4 . A composite according to claim 1 , wherein the carboxylated nitrile rubber is a statistical copolymer.
5 . A composite according to claim 1 , wherein the polymer composite further comprises at least one cross-linking agent.
6 . A composite according to claim 1 , wherein the polymer composite further comprises at least one filler.
7 . A process for preparing a polymer composite according to claim 1 , comprising mixing at least one, optionally hydrogenated, carboxylated nitrile rubber polymer, at least one halogenated butyl rubber, optionally at least one filler and optionally at least one cross-linking agent.
8 . A shaped article comprising at least one, optionally hydrogenated, carboxylated nitrile rubber polymer, and at least halogenated butyl rubber.
9 . A shaped article according to claim 8 in the form of a tire or a tire component.
10 . In a method of increasing the cross-linking density of a halogenated butyl rubber comprising admixing said halogenated butyl rubber with at least one, optionally hydrogenated, carboxylated nitrile rubber polymer, optionally at least on cross-linking agent, and optionally a filler and curing the compound.
11 . In a method according to claim 10 , wherein the carboxylated nitrile rubber is a statistical copolymer.
12 . In a method according to claim 10 , wherein the halogenated butyl rubber is a brominated butyl rubber.