US 6,583,241 B1 · Process for making MVTR resin

Abstract

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.

Claims13

Dependent claims

A process for making an ethylene homopolymer having a polydispersity above 4, and wherein the homopolymer is suitable for producing a film having an MVTR below 0.4, which comprises contacting ethylene with a catalyst comprising a cyclopentadienyl chromium hydrocarbyl compound on a solid silica support, under slurry or gas phase polymerization conditions,

wherein the weight percent of chromium on the solid silica support is between 0.5 and 1.5.

Dependencies are inferred from the claim text.

Facts

Application

09/808,801Filed 15 Mar 2001 · us provisional application

Priority

20 Mar 2000

Granted

24 Jun 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

C08F 10/00
Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double
C08F 110/02
Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond: ethene
C08F 4/63912
Component covered by group C08F4/62 containing a transition metal-carbon bond: in combination with an organoaluminium compound
C08F 4/63916
Component covered by group C08F4/62 containing a transition metal-carbon bond: supported on a carrier, e.g. silica, MgCl2, polymer

Process for making MVTR resin

Life of this patent

Process for making MVTR resin

Life of this patent

Abstract

Claims13