IMPROVED RESIN COMPOSITION FOR EXTRUSION COATING

PROBLEM TO BE SOLVED: To provide a polyethylene-based resin suitable for making an extrusion coating, an article in the form of an extrusion profile, and an extrusion cast film.SOLUTION: There is disclosed a composition which is particularly suited for use in extrusion coating. The composition compr...

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Hauptverfasser:	OSWALD THOMAS T, COOPER JAMES L, GILLESPIE DAVID T, WEINHOLD JEFFREY
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a polyethylene-based resin suitable for making an extrusion coating, an article in the form of an extrusion profile, and an extrusion cast film.SOLUTION: There is disclosed a composition which is particularly suited for use in extrusion coating. The composition comprises a polymeric material having rheology such that the slope S of a natural log-natural log plot of loss modulus (or G'') versus storage modulus (or G') is greater than [0.635*(melt index)+13.2]/[(melt index)+16.6], and wherein the polymeric material has a CDF RI fraction less than 0.23 of a GPC chromatogram which has a molecular weight above 85,000 g/mol, and a CDF LS fraction of more than 0.07 at a conventional GPC molecular weight of 1,750,000 g/mol or greater. The compositions exhibit reduced neck-in when used in extrusion coating and the neck-in is independent of melt strength, thereby facilitating improved extrusion processes.