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US 2014/0328884 A1Published application
Controlled release vehicles having desired void volume architectures
AssigneeCelanese EVA Performance Polymers LLC
InventorsJose Reyes, Kenneth Anderson, Dale Zevotek, Nathan Reuter, J. Gregory Little, Jeffrey Haley, Vassilios Galiatsatos
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Abstract
Controlled release vehicles may include a polymeric matrix that comprises the polymeric matrix comprising at least one selected from the group consisting of an ethylene copolymer, an ethyl cellulose, a thermoplastic polyurethane, any partially crosslinked polymer thereof, and any combination thereof and has a desired void space architecture.
Claims21
1-252. (canceled)
A controlled release vehicle comprising:
- a polymeric matrix having a void space architecture having at least one characteristic selected from the group consisting of a bimodal void diameter distribution, an average void diameter of about 500 microns or less, an average void diameter of about 500 microns or less and a void diameter distribution having a full width at half max of about 50% or less of the average void diameter, an average void distance of about 250 microns or less, an average void distance of about 250 microns or less and a void distance distribution having a full width at half max of about 75% or less of the average void distance, an average pore diameter of about 100 microns or less, an average pore diameter of about 100 microns or less and a pore diameter distribution having a full width at half max of about 50% or less of the average pore diameter, a void space volume of about 95% or less, void density of about 1000 voids per cm3 or greater, and any combination thereof, the polymeric matrix comprising at least one selected from the group consisting of an ethylene copolymer, an ethyl cellulose, a thermoplastic polyurethane, any partially crosslinked polymer thereof, and any combination thereof.
A method comprising:
- irradiating a plurality of polymer pellets comprising an ethylene copolymer, an ethyl cellulose, a thermoplastic polyurethane, and any combination thereof so as to form a partially crosslinked polymer thereof;
- melting the partially crosslinked polymer so as to produce a polymer melt;
- extruding the polymer melt through an extruder;
- introducing a void forming fluid into the polymer melt while in the extruder;
- and
- forming a controlled release vehicle comprising a polymeric matrix having a void space architecture, the polymeric matrix comprising the partially crosslinked polymer.
3 more elements
A method comprising:
- extruding a polymer melt through an extruder, the polymer melt comprising an ethylene copolymer, an ethyl cellulose, a thermoplastic polyurethane, and any combination thereof;
- irradiating the polymer melt while in the extruder so as to form a partially crosslinked polymer thereof;
- introducing a void forming fluid into the polymer melt while in the extruder;
- and
- forming a controlled release vehicle comprising a polymeric matrix having a void space architecture, the polymeric matrix comprising the partially crosslinked polymer.
2 more elements
Dependencies are inferred from the claim text.