Polypropylene foam sheets

Details Polypropylene foam sheets Polypropylene foam sheets

1992-05-22

1993-01-19

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 451, 264 455, 264 51, 264 53, 264 54, 521 79, 521134, 521143, 521144, C08J 934

Patent

active

051807513

ABSTRACT:
A thermoformable, rigid or semi-rigid polypropylene foam sheet having a smooth surface and a uniform cell structure and a density of at least 2.5 lbs/ft.sup.3 is prepared by extruding a mixture of a nucleating agent, a physical blowing agent and a polypropylene resin having a high melt strength and high melt elasticity.

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J. S. Colton, Plastics Engineering 44(8), 53-55 (1988).

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