Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
2000-01-18
2000-12-12
Nutter, Nathan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523149, 137 13, B05D 508, C08J 514
Patent
active
061600369
ABSTRACT:
High concentration drag reducing agents may be prepared by microencapsulating polymer drag reducing agent. The microencapsulation may be performed prior to, during, or after the polymerization of monomer into effective drag reducing polymer. If encapsulation is done before or during polymerization, a catalyst may be present, but little or no solvent is required. The result is very small scale bulk polymerization within the microcapsule. The inert capsule or shell may be removed before, during or after introduction of the microencapsulated drag reducer into a flowing liquid. No injection probes or other special equipment is expected to be required to introduce the drag reducing slurry into the liquid stream, nor is grinding (cryogenic or otherwise) of the polymer necessary to form a suitable drag reducing agent.
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DIALOG.RTM. database record for EP 639240, patent document published Feb. 22, 1995.
J. Franjione, et al., "The Art and Science of Microencapsulation," Technology Today, Jun., 1995.
Kommareddi Nagesh S.
Rzeznik Lawrence J.
Baker Hughes Incorporated
Nutter Nathan M.
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