Chevron Phillips Chemical Company LP

Lawrence Szmutko

Max P McDaniel

Ashish M Sukhadia

Ted H Cymbaluk

Rajendra K Krishnaswamy

Charles D Mills

James A Solis

Jung-Kwang D Kang

Jung-Kwang Kang

Multilayer cast films with an ethylene/&#x3b1;-olefin copolymer core layer, and inner and outer layers containing low density polyethylene homopolymers, and multilayer cast films with an ethylene polymer core layer, and inner and outer layers containing ethylene/&#x3b1;-olefin copolymers, are described. These cast films have a reduced tendency to block, and are useful in various food packaging applications.

Multilayer cast films with reduced blocking and methods of making same

A polymeric resin having a density of greater than about 0.960 g/cc, a melt index of from about 1.3 g/10 min. to about 2.8 g/10 min., a zero shear viscosity of from about 1&#xd7;10Pa*s to about 1&#xd7;10Pa*s, a recoverable shear parameter of from about 220 to about 370, and a CY-a parameter of from about 0.155 to about 0.200. A polymeric resin having an initial tension defined by the equation IT&#x2267;&#x2212;1.67*(MI)+b where b is 5.17 and a percent decrease in the extrusion pressure of the resin of about 30% when compared to polymer resin of similar melt index prepared with a catalyst that has not undergone an activation comprising an oxidation, reduction, oxidation sequence wherein the resin when formed into a film has a moisture vapor transmission rate of from about 0.21 g.mil/100 in/day to about 0.33 g.mil/100 in/day.

Polyethylene film having improved barrier properties and methods of making same

A method comprising (a) providing a catalyst comprising chromium and a support having a pore volume of from about 1.7 ml/g to about 3.5 ml/g and a surface area of from about 450 m/g to about 700 m/g, (b) oxidizing the catalyst to form an oxidized catalyst, (c) reducing the oxidized catalyst to form an oxidized reduced catalyst, (d) oxidizing the oxidized reduced catalyst to form an activated catalyst, (e) contacting the activated catalyst with an olefin under conditions suitable to form a polyolefin, and (f) recovering the polyolefin, wherein the polyolefin has a density of greater than about 0.960 g/cc and a melt index of from about 1.3 g/10 min. to about 2.8 g/10 min.

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Orange, TX, United States of America

Lawrence Szmutko