Chevron Phillips Chemical Company LP

Charles D Mills

James A Solis

Rajendra K Krishnaswamy

Eduardo Vega, Jr

Richard C Wagner

Brian Deaton

Kevin J Taylor

Gray A Golze

David L Beach

Gene E Kellum

Javier M Mora

Lawrence Szmutko

James H Addcox

Jung-Kwang D Kang

Mary A Schexnayder

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 multilayer polymer film comprising at least one core layer disposed between two skin layers, wherein at least one of the core layers, one of the skin layers, or both one of the core layers and one of the skin layers comprises a saturated organic fatty amide (SOFA) slip agent. A multilayer polymer film comprising an effective amount of a SOFA slip agent in at least one core layer such that the film exhibits blocking of equal to or less than about 75 grams. A method of packaging a product comprising providing a package fabricated from such films and placing the product in the package, wherein loose dust is not applied to the exterior of the package to reduce blocking. A method for the reduction of the presence of wax on the surface of a multilayer polymer film comprising adding a SOFA slip agent to a core layer of the film.

Composition and method for the addition of saturated slip agents to multilayer polyethylene films

Compositions and methods are described herein for use in packaging having improved moisture vapor barrier properties. In certain embodiments of the present invention, packaging articles can be made having improved oxygen barrier properties as well. Compositions of the present invention can comprise a low molecular weight hydrogenated aliphatic resin and either a high density polyethylene or a branched or linear low density polyethylene. The low molecular weight hydrogenated aliphatic resin has a weight-average molecular weight of less than about 2000 g/mol. Preferably, the low molecular weight hydrogenated aliphatic resin comprises hydrogenated poly (dicyclopentadiene) or the product of hydrogenating a polymer produced by polymerizing a reaction mixture comprising dicyclopentadiene.

Polyethylene/low molecular weight hydrogenated aliphatic resin blends

The present invention is directed to producing a resin which, when formed into a film, has excellent gas barrier and/or moisture barrier (low MVTR) properties. Further, the resin has a relatively high molecular weight distribution, preferably above 6, and has excellent processability/extrudability. The resin is produced using a cyclopentadienyl chromium compound, preferably a mono CpCr compound, on a support, preferably a silica support. A particularly preferred catalyst for use in the present invention comprises pentamethylcyclopentadienyidimethylchromiumpyridine. Preferably, the catalyst is used in a slurry polymerization process.

Process for making MVTR resin

A process is disclosed for producing polyethylene resin of broad molecular weight distribution, when formed into a film, high barrier to moisture (low MVTR (Moisture Vapor Transmission Rate) for the film). The resin is formed by polymerizing ethylene, preferably in a gas phase process or in a slurry process, using a post-titanated catalyst, that is, a catalyst wherein after initial formation of a catalyst comprising Cr&mdash;Ti-inorganic refractory support, further titanium is added to the catalyst in a post-titanation step, preferably to increase the titanium content of the catalyst to a final level preferably between 7 and 9.5 wt. %.

MVTR resin produced with post-titanated Cr/Si/Ti catalyst

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Orange, TX, United States of America

Charles D Mills