Severely Hydrotreated Naphthenic Distillate Containing Rubber Compositions
A composition includes at least one natural or synthetic rubber material, a severely hydrotreated naphthenic distillate incorporated in amount equal to or less than 30% by weight of the composition, and a sulfur curative. After curing, the composition provides acceptable cold flexibility at a temperature lower than −60 deg C., at a temperature as low as −68 deg C., or even at a temperature as low as −73 deg C. In some aspects, the at least one natural or synthetic rubber material is a synthetic rubber such as, but not limited to, an ethylenepropylene-diene copolymer rubber. In some cases, where used, the ethylenepropylene-diene copolymer rubber is selected from the group consisting of ethylene-propylene-cyclopentadiene terpolymer, ethylene-propylene ethylidene norbornene terpolymer, ethylene-propylene-I, and mixtures thereof.
1 . A composition comprising:
a) at least one natural or synthetic rubber material;
b) a severely hydrotreated naphthenic distillate incorporated in amount equal to or less than 30% by weight of the composition; and,
c) a sulfur curative;
wherein after curing, the composition provides acceptable cold flexibility at a temperature lower than −60 deg C.
2 . The composition of claim 1 , wherein after curing, the composition provides acceptable cold flexibility at a temperature as low as −68 deg C.
3 . The composition of claim 1 , wherein after curing, the composition provides acceptable cold flexibility at a temperature as low as −73 deg C.
4 . The composition of claim 1 , wherein the at least one natural or synthetic rubber material is a synthetic rubber.
5 . The composition of claim 4 , wherein the synthetic rubber is an ethylenepropylene-diene copolymer rubber.
6 . The composition of claim 5 , wherein the ethylenepropylene-diene copolymer rubber is selected from the group consisting of ethylene-propylene-cyclopentadiene terpolymer, ethylene-propylene ethylidene norbornene terpolymer, ethylene-propylene-I, and mixtures thereof.
7 . The composition of claim 1 , wherein the at least one natural or synthetic rubber material is incorporated in an amount from 22% by weight to 28% by weight based upon total composition weight.
8 . The composition of claim 1 further comprising a curing accelerator.
9 . The composition of claim 8 , wherein the curing accelerator is mercaptobenzothiazole.
10 . The composition of claim 1 as incorporated into a layer of an air brake hose.
11 . A composition for forming a layer of a hose, the comprising:
a) at least one natural or synthetic rubber material;
b) a severely hydrotreated naphthenic distillate incorporated in amount equal to or less than 30% by weight of the composition; and,
c) a sulfur curative.
12 . The composition of claim 11 , wherein after curing, the composition provides acceptable cold flexibility at a temperature as low as −60 deg C.
13 . The composition of claim 11 , wherein after curing, the composition provides acceptable cold flexibility at a temperature as low as −73 deg C.
14 . The composition of claim 11 , wherein the at least one natural or synthetic rubber material is an ethylenepropylene-diene copolymer rubber.
15 . The composition of claim 14 , wherein the ethylenepropylene-diene copolymer rubber is selected from the group consisting of ethylene-propylene-cyclopentadiene terpolymer, ethylene-propylene ethylidene norbornene terpolymer, ethylene-propylene-I, and mixtures thereof.
16 . The composition of claim 11 , wherein the at least one natural or synthetic rubber material is incorporated in an amount from 22% by weight to 28% by weight based upon total composition weight.
17 . The composition of claim 11 further comprising a curing accelerator.
18 . The composition of claim 17 , wherein the curing accelerator is mercaptobenzothiazole.
19 . The composition of claim 18 as incorporated into a layer of an air brake hose.
20 . A composition comprising:
a) ethylenepropylene-diene copolymer rubber selected from the group consisting of ethylene-propylene-cyclopentadiene terpolymer, ethylene-propylene ethylidene norbornene terpolymer, ethylene-propylene-I, and mixtures thereof;
b) a severely hydrotreated naphthenic distillate incorporated in amount equal to or less than 30% by weight of the composition;
c) a sulfur curative; and,
d) a mercaptobenzothiazole curing accelerator;
wherein after curing, the composition provides acceptable cold flexibility at a temperature as low as −68 deg C.