Exxonmobil Chemical Patents Inc.

Virginia Tech Intellectual Properties, Inc.

Exxonmobil Oil Corporation

Donna Sue Davis

Maksymilian Pierre Ravel

Peijun Jiang

Pang-Chia Lu

James McLeod Farley

Timothy Edward Long

Yong Yang

Jay K Keung

Richard Wayne Halle

Alan M Malakoff

Kevin Cable

Sachin Bobade

Douglas J Laurent

Sydney R Wright

David M Simpson

George Panagopoulous

A polycarbonate-polyolefin block copolymer and a process to form a polycarbonate-polyolefin block copolymer by combining mono- or di-hydroxyaryl with vinyl/vinylidene terminated polyolefin to form a polyolefin hydroxyaryl moiety, and combining the polyolefin hydroxyaryl moiety with di-hydroxyaryl and di-substituted carbonyl monomers to form a polycarbonate-polyolefin block copolymer.

Polycarbonate-polyolefin block copolymers and methods of making them

Thermoplastic films particularly suited for use in bags including at least a core layer comprising an ethylene copolymer, wherein the films are subjected to post-quench biaxial orientation are provided. Optionally, the films may have a first skin layer and/or a second skin layer located on each side of the core layer. Embodiments may have the desirable combination of improved puncture toughness and ultimate tensile strength, low manufacturing cost and desirable optical and tactile properties.

Films for use in high strength bags

The invention relates to a film structure combining a metallocene-rich layer and an HDPE-containing layer. A preferred embodiment is a structure having metallocene-rich skin layers and an HDPE-containing core. The structures of the invention are particularly useful for collation shrink.

Collation shrink

A method of selecting polyethylene components for a polyethylene composition having an improved Vicat softening point comprising blending at least a first polyethylene having a first density and a second polyethylene having a second density to form the polyethylene composition, wherein the first density is greater than the second density, and determining a first Vicat softening point (V) of the composition measured, and calculating a second Vicat softening point (V) of the composition using the formula=[&#x3a3;{W(Vicat softening point of the first polyethylene)+W(Vicat softening point of the second polyethylene) . . . W(Vicat softening point of the nth polyethylene)}],wherein Wis the weight fraction of the first polyethylene, Wis the weight fraction of the second polyethylene and Wis the weight fraction of the nth polyethylene, n ranges from 2 to 10 and W+W. . . +W=1.0; comparing Vand V; selecting the polyethylene components such that Vis less than Vfor the polyethylene composition.

Polyethylene blends with improved Vicat softening point

The present invention provides a polymer blend suitable for use as a film or a coating, the polymer blend including from 1 to 99% by weight of a metallocene-produced VLDPE polymer having a density less than 0.916 g/cm , and from 1 to 99% by weight of an LDPE polymer having a density of from 0.916 to 0.928 g/cm wherein the sum of (a) and (b) is 100%. The VLDPE polymer can have a melt index of from 6 to 15 dg/min, or from 9 to 12 dg/min. The present invention further provides polymeric films extrusion cast from such polymer blends, and articles having a flexible substrate and a polymeric film extrusion-coated on the substrate

Metallocene-produced very low density polyethylenes

Films, containers made of high density polyethylene, and articles made therefrom exhibit, for a given density, improved resistance to water vapor transmission. The high density polyethylenes are produced in a metallocene-catalyzed production process. Alternatively, for equivalent water vapor transmission rates (WVTR) an article formed in accordance with the invention will exhibit improved physical properties, such as dart drop impact, more balanced tear properties and improved machine direction (MD) tear properties. Additionally, these high density polyethylenes show a low level of extractables and an excellent organoleptic profile.

Polyethylene articles with improved resistance to water vapor transmission

Growing community of inventors

Beaumont, TX, United States of America

Donna Sue Davis