Foamed polypropylene sheet having improved appearance and a foamable polypropylene composition therefor
AssigneeBP Corporation North America Inc.
InventorsJesse Wu, James H. Han, Phil Jacoby, Mark C. Novak, Constantine Metaxas, Chin Choi-Feng, Ray O. Mills, Daan Feng
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Abstract
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/cm3
Claims20
A rigid, extruded sheet having a density of from about 0.4 to about 0.8 g/cm3 comprising foamed, substantially linear propylene polymer having an essentially monomodal molecular weight distribution and a melt flow rate of from about 0.5 to about 30 g/10 min. determined according to ASTM D1238 condition L, the surfaces of said sheet having a standard deviation in surface roughness of less than about 6%.
A molded article comprising foamed, substantially linear propylene polymer having an essentially monomodal molecular weight distribution and a melt flow rate of from about 0.5 to about 30 g/10 min. determined according to ASTM D1238 condition L, the surfaces of said molded article having a standard deviation in surface roughness of less than about 6%.
Dependencies are inferred from the claim text.