Polypropylene foam sheets

Details Polypropylene foam sheets Polypropylene foam sheets

1990-03-14

1992-05-26

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, 264321, 4283166, 4283188, 521 79, 521134, 521144, C08J 908, C08J 914

Patent

active

051168812

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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K. W. Suh and D. D. Webb, "Cellular Materials", in Encyclopedia Polymer Science & Engineering 3, 1-59 (1985).
Y. D. Lee and L. F. Wang, J. Applied Polymer Science 32(4), 4639-47 (1986).
J. S. Colton, Plastics Engineering 44(8), 53-55 (1988).

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