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US 8,912,297 B2Granted
Low density polyethylene with low dissipation factor and process for producing same
AssigneeDow Global Technologies LLC
InventorsAnny Flory, Michael L. Smith, Chester J. Kmiec, Robert F. Eaton, Alfred E. Vigil
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Abstract
The present disclosure provides a process for producing low density polyethylene with a dissipation factor less than or equal to 1.48×10−4 radian at 2.47 GHz. The process includes free radical high pressure polymerization of ethylene and separation of the unreacted species from the resultant polyethylene to form a recycle stream. The process further includes purging dissipative components from the recycle stream. The purged recycle stream is then introduced into the polymerization reactor.
Claims10
A process for producing a polyethylene composition comprising:
- contacting, in a polymerization reactor under high pressure polymerization conditions, ethylene with a free radical initiator in the presence of a solvent to form a reactor effluent comprising a high pressure low density polyethylene (HP-LDPE) and unreacted species;
- separating the unreacted species from the HP-LDPE to form a recycle stream;
- purging dissipative components from the recycle stream to form a purged recycle stream;
- maintaining a purge fraction from 0.18 to 0.6;
- introducing the purged recycle stream into the polymerization reactor;
- and
- forming a HP-LDPE having a dissipation factor less than or equal to 1.48×10−4 radian at 2.47 GHz.
4 more elements
Dependencies are inferred from the claim text.