Bp Corporation North America Inc.

James H Han

Jesse Wu

Constantine Metaxas

Phil Jacoby

Chin Choi-Feng

Ray O Mills

Mark C Novak

Daan Feng

A coat hanger extrusion die wherein the aperture of the die land widens along the extrusion axis of the die to the die exit opening, thereby forming an expansion zone.

Apparatus for extruding foamed polypropylene sheet having improved surface appearance

Foamable polypropylene composition comprising a polypropylene resin having an D1238L melt flow rate of from about 0.5 to about 30 g/10 min, and a method for extruding rigid, foamed polypropylene sheet with improved surface appearance having a density in the range 0.4 to about 0.8 g/cm

Foamed polypropylene sheet having improved appearance and a foamable polypropylene composition therefor

Foamable polypropylene composition comprising a polypropylene resin having an D1238L melt flow rate of from about 0.5 to about 30 g/10 min, and a method for extruding rigid, foamed polypropylene sheet with improved surface appearance having a density in the range 0.4 to about 0.8 g/cm .

An improved coat hanger extrusion die wherein the aperture of the die land widens along the extrusion axis of said die to the die exit opening, thereby forming an expansion zone, and a method for extruding foamed polypropylene sheet having an improved surface appearance.

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Alpharetta, GA, United States of America

James H Han