High stretch elastomeric pre-stretched tubes
AssigneeMinnesota Mining and Manufacturing Company
InventorSteven D. Yau
Life of this patent
Estimating the term…
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.
Claims15
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 of
- silica, and
- (f) up to about 30 weight percent of a polymeric plasticizer.
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 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.
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:
- (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.
Dependencies are inferred from the claim text.