Methods of preparing EP(D)M elastomer, of controlling yield thereof, and of recovering the same
AssigneeKumho Polychem Co., Ltd.
InventorsSang Bae Kim, Hee Ryoung Koo
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Abstract
Disclosed herein is a method of preparing an EP(D)M elastomer, which includes pre-cooling a reactive solvent to −80 to −100° C.; and polymerizing ethylene, at least one higher α-olefin having 3 to 18 carbons, and selectively, at least one conjugated or non-conjugated diene having 5 to 15 carbons, in the presence of the reactive solvent. According to the method of the current invention, the yield of the EP(D)M elastomer is drastically increased even though a conventional preparation device is used unchanged. Further, methods of controlling the yield of the EP(D)M elastomer and of recovering the EP(D)M elastomer are provided.
Claims11
A method of increasing yield of an EP(D)M elastomer, comprising:
- (1) pre-cooling a reactive solvent to a temperature ranging from −80 to −100° C.;
- and
- (2) polymerizing ethylene, at least one higher α-olefin having 3 to 18 carbons, and optionally, at least one conjugated or non-conjugated diene having 5 to 15 carbons in the presence of the reactive solvent to increase the yield of the EP(D)M elastomer.
A method of recovering an EP(D)M elastomer, comprising:
- (1) pre-cooling a reactive solvent to a temperature ranging from −80 to −100° C.;
- (2) polymerizing ethylene, at least one higher α-olefin having 3 to 18 carbons, and optionally, at least one conjugated or non-conjugated diene having 5 to 15 carbons, in the presence of the reactive solvent, to prepare an EP(D)M elastomer;
- (3) mixing the EP(D)M elastomer with the reactive solvent to prepare a mixture, and pre-heating the mixture by heat exchange using steam immiscible with the mixture;
- (4) reducing a pressure of the mixture to primarily remove the solvent from the mixture;
- and
- (5) thermally drying the mixture obtained in (4), to secondarily remove residual solvent from the mixture.
Dependencies are inferred from the claim text.