Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Patent
1989-03-20
1990-08-21
Buffalow, Edith
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
427 44, 522116, 522120, 525283, 525279, 525296, 525301, B32B 2700
Patent
active
049505491
ABSTRACT:
Polypropylene articles are provided. The polypropylene articles comprise 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 irradiated polypropylene articles having olefinic unsaturation-containing monomers graft-polymerized thereon comprising 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 I.
Krueger Dennis L.
Meyer Daniel E.
Rolando Richard J.
Buffalow Edith
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Truesdale Carole
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