Exxon Chemical Patents, Inc.

Ferdinand C Stehling

Charles Stanley Speed

James McLeod Farley

Prasadarao Meka

Michael C Chen

Howard C Welborn, Deceased

Myron Bernard Kurtzman

Barry C Trudell

James C Randall, Jr

Larry W Colwell

Curtis H Welborn, Jr

Heat sealed articles and heat sealable films comprising a polymer blend of a first polymer having a narrow molecular weight and composition distribution and a second polymer having a broad molecular weight distribution and composition distribution. The articles and films have significantly improved physical characteristics and remarkably low heat seal initiation temperatures, high seal strength, high hot tack and therefore provide improved processibility and higher line speeds on commercial heat sealing equipment.

Heat sealable films and articles made therefrom

Linear ethylene interpolymer blends are disclosed. The blends are made from components having a narrow molecular weight distribution (e.g. M.sub.w /M.sub.n .ltoreq.3) and a narrow composition distribution (e.g. CDBI&gt;50%). The blend components in a blend can all have the same molecular weight but different comonomer contents, the same comonomer content but different molecular weights, or comonomer contents which increase with molecular weight. The blends have either M.sub.w /M.sub.n &gt;3 or CDBI&lt;50%, or both, and can be multimodal with respect to either or both molecular weight and/or comonomer content. The blends are generally free of blend components having both a higher average molecular weight and a lower average comonomer content than another blend component. The blends can have improved mechanical, physical and/or chemical properties.

Linear ethylene interpolymer blends of interpolymers having narrow

Linear interpolymer blends are disclosed. The blends are made from components having a narrow molecular weight distribution (e.g. Mw/Mn.ltoreq.3) and a narrow composition distribution (e.g. CDBI&gt;50%). The blend components of the blend can all have the same molecular weight but different comonomer contents, the same comonomer content but different molecular weights, or comonomer contents which increase with molecular weight. The blends have either Mw/Mn&gt;3 and/or CDBI&lt;50%, and combinations of each, and can be bimodal with respect to either or both molecular weight and/or comonomer content. The blends are generally free of blend components having both a higher average molecular weight and a lower average comonomer content than another blend component. The blends can have improved mechanical, physical and/or chemical properties. Single or multilayer films having enhanced physical properties are made from the blends. Also, the interpolymer blends of this invention can be blended or coextruded with other polymers to further enhance processability of and the physical characteristics of the blends.

A method for fractionating crystalline copolymers to determine solubility distribution as a function of temperature. Fractionation is conducted by passing a solvent through a column containing the crystallized copolymer at an increasing temperature from 6.degree. C. to about 120.degree. C. The polymer solution exiting the column is analyzed by infrared spectroscopy or NMR to determine the composition distribution of the copolymer.

Method for determining the compositional distribution of a crystalline

A modified polypropylene having a substantially isotactic homopolypropylene and a propylene/olefin random copolymer, the modified polypropylene including up to about 50 chain disruptors per 1000 propylene repeat units. The chain disruptors are racemic polypropylene diads and olefin, the olefin being incorporated into the high end of the molecular weight distribution of the modified polypropylene.

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Baytown, TX, United States of America

Ferdinand C Stehling