RUBBER COMPOSITION FOR BARRIER LAYER
A barrier layer is provided for impeding the flow of inflation gas through an inflatable article, the barrier layer constructed of a material that is based upon a cross-linkable rubber composition, the cross-linkable rubber composition comprising, per 100 parts by weight of rubber (phr), between 50 phr and 90 phr of a butyl rubber and between 10 phr and 50 phr of a total amount of a GCO copolymer comprising epichlorohydrin derived units and allyl glycidyl ether derived units and a GECO terpolymer comprising epichlorohydrin derived units, allyl glycidyl ether derived units and ethylene oxide derived units, wherein the GECO terpolymer is between 1 percent by weight and 50 percent by weight of the total and also including a sulfur cure system.
1 . A barrier layer for impeding the flow of inflation gas through an inflatable article, the barrier layer constructed of a material that is based upon a cross-linkable rubber composition, the cross-linkable rubber composition comprising, per 100 parts by weight of rubber (phr):
between 50 phr and 90 phr of a butyl rubber;
between 10 phr and 50 phr of a total amount of a GCO copolymer comprising epichlorohydrin derived units and allyl glycidyl ether derived units and a GECO terpolymer comprising epichlorohydrin derived units, allyl glycidyl ether derived units and ethylene oxide derived units, wherein the GECO terpolymer is between 1 percent by weight and 50 percent by weight of the GCO and GECO total;
a sulfur cure system.
2 . The barrier layer of claim 1 , wherein the cross-linkable rubber composition further comprises:
a platy filler.
3 . The barrier layer of claim 2 , wherein the platy filler is an organo-modified platy filer.
4 . The barrier layer of claim 3 , wherein the platy filler is an organoclay.
5 . The barrier layer of claim 2 , wherein the cross-linkable rubber composition comprises between 1 phr and 15 phr of the platy filler.
6 . The barrier layer of claim 1 , wherein the cross-linkable rubber composition further comprises:
a plasticizing terpene resin.
7 . The barrier layer of claim 1 , wherein the cross-linkable rubber composition comprises between 80 phr and 90 phr of the butyl rubber and wherein the GECO terpolymer is between 5 percent by weight and 40 percent by weight of the total.
8 . The barrier layer of claim 7 , wherein the GECO terpolymer is between 20 percent by weight and 40 percent by weight of the total.
9 . The barrier layer of claim 1 , wherein the butyl rubber is halogenated.
10 . The barrier layer of claim 9 , wherein the butyl rubber is bromobutyl rubber.
11 . The barrier layer of claim 1 , wherein the barrier layer is an inner tube adapted for a pneumatic tire.
12 . The barrier layer of claim 1 , wherein the barrier layer is adapted for a pneumatic tire.
13 . The barrier layer of claim 12 , wherein the barrier layer is disposed on an interior surface of the pneumatic tire.
14 . A pneumatic tire comprising a barrier layer for impeding the flow of inflation gas through the pneumatic tire, the barrier layer constructed of a material that is based upon a cross-linkable rubber composition, the cross-linkable rubber composition comprising, per 100 parts by weight of rubber (phr):
between 50 phr and 90 phr of a butyl rubber;
between 10 phr and 50 phr of a total amount of a GCO copolymer comprising epichlorohydrin derived units and allyl glycidyl ether derived units and a GECO terpolymer comprising epichlorohydrin derived units, allyl glycidyl ether derived units and ethylene oxide derived units, wherein the GECO terpolymer is between 1 percent by weight and 50 percent by weight of the GCO and GECO total;
a sulfur cure system.
15 . The pneumatic tire of claim 14 , wherein the cross-linkable rubber composition further comprises:
a platy filler.
16 . The pneumatic tire of claim 14 , wherein the cross-linkable rubber composition comprises between 80 phr and 90 phr of the butyl rubber and wherein the GECO terpolymer is between 5 percent by weight and 40 percent by weight of the total.
17 . The pneumatic tire of claim 16 , wherein the GECO terpolymer is between 20 percent by weight and 40 percent by weight of the total.
18 . The pneumatic tire of claim 14 , wherein the barrier layer is disposed on an interior surface of the pneumatic tire.