Phillips Petroleum Company

Chevron Phillips Chemical Company LP

Chevron Philips Chemical Company, LP

Al R Wolfe

Max P McDaniel

Elizabeth Ann Benham

Paul J DesLauriers

Steven J Secora

William R Coutant

David C Rohlfing

William B Beaulieu

David R Battiste

Joseph J Bergmeister

Paul J Deslauriers

Pamela L Maeger

David F Register

Pamela L Meager

Harry E Straw

The present invention is directed to PE-100 ethylene copolymers and pipe made thereof having a Tabor abrasion between about 0.01 and about 0.001 grams lost/1000 revolutions. These copolymers are formed by contacting ethylene with at least one mono-1-olefin comonomer having from 2 to about 10 carbon atoms per molecule in a reaction zone under polymerization conditions in the presence of a hydrocarbon diluent, a catalyst system, and a cocatalyst. Additionally, the comonomers may be selected from mono-1-olefins having 4 to 10 carbon atoms, such as, 1-hexene, 1-butene, 4-methyl-1-pentene, 1-octene, and 1-decene. Further, these ethylene copolymers may be employed to produce PE-100 pipe having both small diameters and diameters in excess of 42 inches substantially without sagging or other gravitational deformation. Copolymers of ethylene and 1-hexene are disclosed which are used to produce PE-100 pipe.

Olefin polymers, method of making, and use thereof

A process to produce ethylene polymers is provided.

Process to produce polymers

A copolymer of ethylene and a higher alpha olefin, preferably 1-hexene, can be produced using an activated chromium containing catalyst system and a cocatalyst selected from the group consisting of trialkylboron, trialkylsiloxyalutninum, and a combination of trialkylboron and thalkylaluminum compounds. The polymerization process must be carefully controlled to produce a copolymer resin having an exceptionally broad molecular weight distribution, extremely high PENT ESCR values, and a natural branch profile that impacts branching preferably into the high molecular weight portion of the polymer. The resulting copolymer resin is especially useful in high stiffness pipe applications.

Polymerization catalyst systems and processes therefor and therewith

The present invention is directed to homo-polymers and copolymers of mono-1-olefins, a method of making such polymers,and uses of such polymers. Polymers of the present invention are formed by contacting at least one mono-1-olefin having from 2 to about 20 carbon atoms per molecule and at least one mono-1-olefin co-monomer having from 2 to about 10 carbon atoms per molecule in a reaction zone under polymerization conditions in the presence of a hydrocarbon diluent, a catalyst system, and a cocatalyst. In another aspect of the present invention, ethylene copolymers are employed to produce PE-100 pipe. Further, these ethylene copolymers may be employed to produce PE-100 pipe having both small diameters and diameters in excess of 42 inches substantially without sagging or other gravitational deformation. Copolymers of ethylene and 1-hexene are disclosed which are used to produce PE-100 pipe.

A copolymer of ethylene and a higher alpha olefin, preferably 1-hexene, can be produced using an activated chromium containing catalyst system and a cocatalyst selected from the group consisting of trialkylboron, trialkylsiloxyaluminum, and a combination of trialkylboron and trialkylaluminum compounds. The polymerization process must be carefully controlled to produce a copolymer resin having an exceptionally broad molecular weight distribution, extremely high PENT ESCR values, and a natural branch profile that impacts branching preferably into the high molecular weight portion of the polymer. The resulting copolymer resin is especially useful in high stiffness pipe applications.

A process is provided to produce a catalyst system. The process comprises blending a first component and a second component. The first component of the catalyst system comprises chromium on a support. The amount of chromium on the support is from about 0.05 to about 5 weight percent based on the weight of the support. The support comprises fluorided alumina. The support has a surface area from about 200 to about 550 square meters per gram and a pore volume from about 0.7 to about 2.5 cubic centimeters per gram. The first component is activated at a temperature in the range of about 500&deg; C. to about 900&deg; C. The second component is a transition metal halide catalyst. A process comprising polymerizing ethylene or copolymerizing ethylene and at least one other monomer using the catalyst system to produce ethylene polymers is also provided.

Polymerization processes for ethylene and at least one mono-1-olefin comonomer having from about three to eight carbon atoms per molecule in the presence of a catalyst system comprising chromium supported on a silica-titania support and a trialkylboron compound is provided. Novel ethylene copolymers also are produced.

Polymerization process

This invention concerns a resin formulation for an organically pigment polyolefin resin suitable for tubing and pipe service. The resin formulation is comprised of ethylene polymers, a UV stabilizer, an antioxidant, and a tetrachloroisoindolinone pigment. The resulting resin possesses excellent heat stability and color fastness. The dilute concentration of organic pigment in the inventive formulation presents a cost acceptable alternative to the widely- and routinely-used cadmium- and lead-bearing dyes and pigments which are classified as toxic chemicals under SARA Title III Section 313.

Polyolefin resin formulation using organic pigments

A process for forming plastic tubing which involves extruding a molten plastic composition through a die which produces an extended length of plastic tubing, passing the hot tubing through a vacuum sizing tube wherein the wall of the tubing is sized by being drawn to the wall of the sizing tube by a vacuum, and cooling the sized tubing so that the tubing will be self-supporting at normal ambient temperatures, wherein the plastic composition contains a phosphorus-containing additive in an amount sufficient to cause an improvement in the smoothness of the interior of said tubing.

Process for making smooth plastic tubing

A propylene polymer composition containing a clarifier and a small amount of a hydrotalcite to enhance the effect of the clarifier. The resulting composition is of particular value as an injection molding grade resin.

Growing community of inventors

Bartlesville, OK, United States of America

Al R Wolfe