Elastomeric compositions comprising hydrocarbon polymer additives having improved impermeability
AssigneeExxonMobil Chemical Patents Inc.
InventorsMichael B. Rodgers, Rick D. Davis, Anthony J. Dias, Weiqing Weng
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Abstract
An elastomeric compositions having improved impermeability is disclosed. The cured elastomeric composition may comprise at least one C4-C7 monoolefin elastomer, a hydrocarbon polymer additive, and a clay. In some embodiments, the cured elastomeric composition has a permeation coefficient at 40° C. of 90 cc*mm/(m2-day) or less. In some embodiments, the elastomeric composition is substantially free of naphthenic oil.
Claims25
A cured elastomeric composition comprising:
- a) at least one C4-C7 monoolefin elastomer;
- b) a hydrocarhon o t e additive, wherein the hydrocarbon polymer additive comprises a cyclic component and has an Mw in the range of about 500 to 700 g/mole and a Tg in the range of about 65 to 75° C.;
- wherein the hydrocarbon polymer additive comprises at least 75 wt % of cyclic components and
- c) a clay;
- wherein the composition has a permeation coefficient of 40° C. of 90 cc*mm/(m2-day) or less, and is substantially free of naphthenic oil.
A cured elastomeric composition comprising:
- a) at least one C4-C7 monoolefin elastomer;
- b) a hydrocarbon polymer additive, wherein the hydrocarbon polymer additive comprises a cyclic component and has an Mw in the range of about 500 to 700 g/mole and a Tg in the range of about 65 to 75° C.;
- wherein the hydrocarbon polymer additive has a softening point in the range of about 115 to about 130° C.;
- and
- c) a clay;
- wherein the composition has a permeation coefficient at 40° C. of 90 cc*mm/(m2-day) or less, and is substantially free of naphthenic oil.
An air barrier comprising an elastomer composition made by the method of:
- a) combining at least one C4-C7 monoolefin based elastomer, at least one filler, at least one clay, and at least one hydrocarbon polymer additive, wherein the hydrocarbon polymer additive has a softening point in the range of about 115 to about 130° C. and comprises a cyclic component, and at least one cure agent, and wherein the composition is substantially free of naphthenic oil;
- and
- b) curing the combined components.
An elastomeric composition comprising:
- a) at least one C4-C7 monoolefin elastomer;
- b) a hydrocarbon polymer additive, wherein the hydrocarbon polymer additive has a softening point in the range of about 115 to about 130° C. and comprises dicyclopentadiene;
- and
- c) a clay;
- wherein the composition is substantially free of naphthenic oil.
Dependencies are inferred from the claim text.