Plastic and nonmetallic article shaping or treating: processes – Formation of solid particulate material directly from molten... – With subsequent uniting of the particles
Patent
1990-06-27
1992-01-07
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Formation of solid particulate material directly from molten...
With subsequent uniting of the particles
264 7, 264 12, 264 22, 264129, 264178F, 26421113, 26421114, 264216, 264236, 264347, 427 44, 156167, 1562755, B29C 3510
Patent
active
050789252
ABSTRACT:
Polypropylene articles are provided. The polypropylene articles include non-crystalline mesomorphous polypropylene having olefinic unsaturation-containing monomers graft-polymerized thereon by ionizing radiation in a dosage sufficient to degrade crystalline polypropylene. The irradiated polypropylene articles retain useful tensile properties after storage periods of as long as at least about four months. Further provided is a method for preparing irradiation polypropylene articles having olefinic unsaturation-containing monomers graft-polymerized thereon including the steps of melt extruding polypropylene; quenching the extruded polypropylene immediately after extrusion to provide non-crystalline mesomorphous polypropylene; coating the non-crystalline mesomorphous polypropylene with an ionizing radiation graft-polymerizable monomer; and irradiating the coated non-crystalline mesomorphous polypropylene with a dosage of ionizing radiation sufficient to degrade crystalline polypropylene and sufficient to effect graft-polymerization of the monomer onto the surface of the polypropylene.
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Insley Thomas L.
Krueger Dennis L.
Meyer Daniel E.
Rolando Richard J.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Thurlow Jeffery
Truesdale Carole
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