High stretch elastomeric pre-stretched tubes
First Claim
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1. An article comprising an elastomeric tubular member supported in a stretched condition on an easily removable core, said tubular member comprising:
- (a) about 10 to 50 weight percent of an oil-extended ethylene propylene diene monomer rubber,(b) about 5 to 25 weight percent of an elastomer selected from the group consisting of a nonoil-extended ethylene propylene diene monomer rubber and nonoil-extended ethylene propylene(c) about 5 to 15 weight percent of an extender,(d) about 10 to 30 weight percent of a processing oil,(e) about 2 to 30 weight percent ofsilica, and(f) up to about 30 weight percent of a polymeric plasticizer.
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Abstract
Compositions and a process for manufacturing an elastomeric, low modulus pre-stretched tubular article supported by a removable core. The article has a low Shore A hardness value and a low modulus which allows a large expansion ratio and an increased wall thickness.
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Citations
15 Claims
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1. An article comprising an elastomeric tubular member supported in a stretched condition on an easily removable core, said tubular member comprising:
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(a) about 10 to 50 weight percent of an oil-extended ethylene propylene diene monomer rubber, (b) about 5 to 25 weight percent of an elastomer selected from the group consisting of a nonoil-extended ethylene propylene diene monomer rubber and nonoil-extended ethylene propylene (c) about 5 to 15 weight percent of an extender, (d) about 10 to 30 weight percent of a processing oil, (e) about 2 to 30 weight percent of silica, and (f) up to about 30 weight percent of a polymeric plasticizer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An article comprising an elastomeric tubular member supported in a stretched condition on an easily removable core, said tubular member comprising:
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(a) about 10 to 50 weight percent of an oil-extended ethylene propylene rubber, (b) about 5 to 25 weight percent of an elastomer selected from the group consisting of a nonoil-extended ethylene propylene diene monomer rubber and nonoil-extended ethylene propylene rubber, (c) about 5 to 15 weight percent of an extender, (d) about 10 to 30 weight percent of a processing oil, (e) about 2 to 30 weight percent of silica, and (f) up to about 30 weight percent of a polymeric plasticizer.
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14. A process for manufacturing an article comprising an elastomeric tubular member supported in a stretched condition on an easily removable core, said process comprising the steps of:
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(a) mixing about 5 to 25 weight percent of an elastomer selected from the group consisting of a nonoil-extended ethylene propylene diene monomer rubber and nonoil-extended ethylene propylene rubber with about 2 to 30 weight percent resin of precipitated silica, (b) adding about 10 to 50 weight percent of an oil-extended ethylene propylene diene monomer rubber, (c) adding a sufficient amount of a curative, (d) heating said mixture to a temperature below the decomposition temperature of said curative, (e) forming said mixture into an V appropriate shape, (f) allowing said mixture to cure into a solid composition, and (g) loading said solid composition on an easily removable core. - View Dependent Claims (15)
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Specification