Halogen- and sulfur-free shaped articles containing peroxide curable compounds of butyl rubber
View Patent ↗The present invention relates to a shaped article for high purity applications containing at least one peroxide curable compound containing a substantially gel-free butyl polymer. In another of its aspects, the present invention relates to a sealing material and a medical device containing at least one peroxide-curable compound containing a substantially gel-free butyl polymer. In still another of its aspects, the present invention relates to a fuel cell containing at least one peroxide curable compound containing a substantially gel-free butyl polymer. In still another of its aspects, the present invention relates to halogen-free and sulfur-free shaped articles.
1. A shaped vulcanized article for high purity applications comprising at least one compound comprising:
a. at least one elastomeric polymer comprising repeating units derived from at least one C 4 to C 7 isomonoolefin monomer, at least one C 4 to C 14 multiolefin monomer, at least one multiolefin cross-linking agent and at least one chain transfer agent, and wherein said polymer comprising less than 15 wt. % of solid matter insoluble in boiling cyclohexane under reflux for 60 min,
b. at least one filler and
c. a peroxide curing system;
wherein the chain transfer agent is selected from 1-methylcycloheptene, 1-methyl-1-cyclopentene, 2-ethyl-1-hexene, 2,4,4-trimethyl-1-pentene, indene or mixtures thereof
wherein the shaped vulcanized article is halogen-free and sulfur free.
2. An article according to claim 1 , wherein in the compound the C 4 to C 7 isomonoolefin monomer(s) are selected from the group consisting of isobutylene, 2-methyl-1-butene, 3-methyl-1-butene, 2-methyl-2-butene, 4-methyl-1-pentene and mixtures thereof.
3. An article according to claim 1 , wherein in the compound the C 4 to C 14 multiolefin monomer(s) are selected from the group consisting of isoprene, butadiene, 2-methylbutadiene, 2,4-dimethylbutadiene, piperyline, 3-methyl-1,3-pentadiene, 2,4-hexadiene, 2-neopentylbutadiene, 2-methyl-1,5-hexadiene, 2,5-dimethyl-2,4-hexadiene, 2-methyl-1,4-pentadiene, 2-methyl-1,6-heptadiene, cyclopentadiene, methylcyclopentadiene, cyclohexadiene, 1-vinyl-cyclohexadiene and mixtures thereof.
4. An article according to claim 1 , wherein in the compound the multiolefin cross-linking agent(s) are selected from the group consisting of norbornadiene, 2-isopropenylnorbornene, 5-vinyl-2-norbornene, 1,3,5-hexatriene, 2-phenyl-1,3-butadiene, divinylbenzene, diisopropenylbenzene, divinyltoluene, divinylxylene and C1 to C20 alkyl-substituted derivatives of the above compounds.
5. An article according to claim 1 , wherein in the compound the peroxide system is organic peroxide.
6. An article according to claim 1 in the form of a condenser cap.
7. An article according to claim 1 in the form of a medical device.
8. A medical device comprising an article according to claim 1 .
9. A fuel cell comprising an article according to claim 1 .