Peroxide curable compounds based on butyl-like polymer without conjugated aliphatic dienes in its composition
View Patent ↗The present invention relates to a shaped article containing at least one peroxide curable compound containing a butyl-like polymer(s) without any conjugated aliphatic diene in its composition, said polymer containing less than 15 wt. % of solid matter insoluble in boiling cyclohexane under reflux for 60 min. The present invention also relates to a sealing material and a medical device containing at least one peroxide-curable compound containing a butyl-like polymer containing less than 15 wt. % of solid matter insoluble in boiling cyclohexane under reflux for 60 min. Further, the present invention relates to a process for producing a butyl-like polymer having no conjugated aliphatic diene in its composition and containing less than 15 wt. % of solid matter insoluble in boiling cyclohexane under reflux for 60 min. In addition, the present invention relates to a process the manufacturing of the inventive compound wherein the elastomeric polymer is mixed with at least one filler and at least one peroxide curing system in a mixing means.
1. A compound comprising:
a. at least one elastomeric polymer having an average molecular weight M n of more than 20,000 g/mol and less than 15 wt. % of solid matter insoluble in boiling cyolohexane under reflux for 60 mm comprising repeating units derived from at least one C 4 to C 7 isomonoolefin monomer, at least one multiolefin cross-linking agent and at least one chain transfer agent,
b. at least one filler and
c. a peroxide curing system,
wherein the elastometic polymer does not comprise a conjugated diene or a C 4 to C 14 multiolefin monomer, and
wherein the chain transfer agent has a transfer coefficient of at least 10 and is 1-methylcycloheptene, 1-methyl-1-cyclopentene, 2-ethyl-1-hexene, 2,4,4-trimethyl-1-pentene, indene or a mixture thereof.
2. A compound according to claim 1 , wherein the multiolefin cross-linking agent(s) is norbomadiene, 2-isopropenyl norbomene, 5-vinyl-2-norbornene, 1,3,5-hexatriene, 2-phenyl-1,3-butadiene, divinylbenzene, diisopropenylbenzene, divinyltoluene, divinylxylene, C 1 to C 20 alkyl-substituted derivatives of the above compounds or mixtures thereof.
3. A compound according to claim 1 , wherein the peroxide system is an organic peroxide.
4. A compound according to claim 3 , wherein the peroxide system is dialkylperoxides, ketalperoxides, aralkylperoxides, peroxide ethers, peroxide esters, such as di-tert.-butylperoxide, bis-(tert.-butylperoxy-isopropyl)-benzene, dicumylperoxide, 2,5-dimethyl-2,5-di(tert.-butylperoxy)-hexane, 2,5-dimethyl-2,5-di(tert.-butylperoxy)-hexene-(3), 1,1-bis-(tert.-butylperoxy)-3,3,5-trimethyl -cyclohexane, benzoylperoxide, tert.-butylcumylperoxide, tert.-butylperbenzoate or a mixture thereof.
5. A compound according to claim 1 , wherein the polymer comprises one or more additional polymerizable co-polymers selected from the group consisting of p-methylstyrene, styrene, α-methylstyrene, p-chlorostyrene, p-methoxystyrene, indene and mixtures thereof.
6. A compound according to claim 1 further comprising a rubber selected from the group consisting of polybutadiene, butadiene/acrylic acid-C 1 –C 4 -alkylester-copolymers, polychloroprene, polyisoprene, styrene/butadiene-copolymers with styrene contents in the range of 1 to 60 wt %, butadiene/acrylonitrile-copolymers with acrylonitrile contents of 5 to 60 wt %, partially or totally hydrogenated NBR-rubber, ethylene/propylene/diene-copolymers, fluoropolymers, fluororubbers and mixtures.
7. A process for the manufacturing of a compound according to claim 1 , wherein the elastomeric polymer is mixed with at least one filler and at least one peroxide curing system in a mixing means.
8. A process for the manufacturing of an elastomeric polymer comprising the step of polymerizing a monomer mixture comprising at least one C 4 to C 7 isomonoolefin monomer, at least one multifunctional cross-linking agent, and at least one chain-transfer agent in the presence of a catalyst, wherein the polymer contains less than 15 wt. % of solid matter insoluble in boiling cyclohexane under reflux for 60 mm and has no double-bonds in the polymer chain, and wherein the chain transfer agent has a transfer coefficient of at least 10 and is 1-methylcycloheptene, 1-methyl-1-cyclopentene, 2-ethyl-1-hexene, 2,4,4-trimethyl-1-pentene, indene,or a mixtures thereof.
9. A shaped article comprising a compound according to claim 1 .
10. A vulcanized shaped article prepared by vulcanizing a shaped article according to claim 6 .
11. A compound comprising:
a. at least one elastomeric polymer having an average molecular weight M n of more than 20,000 g/mol and less than 15 wt. % of solid matter insoluble in boiling cyclohexane under reflux for 60 mm comprising repeating units derived from at least one C 4 to C 7 isomonoolefin monomer, at least one multiolefin cross-linking agent and at least one chain transfer agent,
b. at least one filler, and
c. a peroxide curing system,
wherein the compound is isoprene free, wherein the polymer does not comprise a conjugated diene or a C 4 –C 14 multiolefin monomer and wherein the chain transfer agent has a transfer coefficient of at least 10 and is 1-methylcycloheptene, 1-methyl-1-cyclopentene, 2-ethyl-1-hexene, 2,4,4-trimethyl-1-pentene, indene, or a mixtures thereof.