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US 6,143,842 AGranted
Elastomeric polyolefins production and recovery
AssigneeHuntsman Polymers Corporation
InventorsSamuel J. Paton, Stephen C. McHaney, Steven L. Oetting, Karl L. Herzog
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Abstract
Disclosed herein are novel polymers and copolymers of alphaolefins produced using various Ziegler/Natta and Metallocene catalysts. Commercial production of these polymers is now possible for the first time owing to the polymer harvesting technology also disclosed herein.
Claims18
A method for the production and recovery of polyolefin polymers which comprises:
- reacting monomers in a reaction zone in the presence of a catalyst to form a high molecular weight amorphous polyolefin material;
- continuously transferring the polyolefin material along with residual catalyst and unreacted monomer(s) as a mixture from the reaction zone to a conditioning zone of known volume;
- heating the mixture in the conditioning zone to a temperature of at least about 250.degree. F. while kneading the mixture for a time sufficient to form conditioned polyolefin and to remove unreacted monomer(s);
- determining the volume of the mixture in the conditioning zone;
- removing the conditioned polyolefin from the conditioning zone;
- and
- controlling at least one of the polyolefin material transfer or conditioned polyolefin removal steps to maintain a sufficient volume of the mixture in the conditioning zone to provide a residence time for the polyolefin which is sufficient to enable removal of a substantial portion of the unreacted monomer(s) while avoiding overheating of the polyolefin.
4 more elements
Dependencies are inferred from the claim text.