Rotational molding compositions and process for producing foamed

Details Rotational molding compositions and process for producing foamed Rotational molding compositions and process for producing foamed

1998-07-14

1999-07-13

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 454, 264 457, 264 54, 521134, 521142, 521143, C08J 934

Patent

active

059227788

ABSTRACT:
Improved compositions useful for the production of rotomolded articles having a foamed interior and non-foamed exterior skin are provided. The compositions of the invention are comprised of a first thermoplastic resin component which is an ethylene polymer in pellet form containing a chemical foaming agent, an organic peroxide and, optionally, a metal-containing activator compound and a second resin component which is a powder and can be a thermoplastic ethylene polymer or ethylene copolymer having less than 30% crystallinity. An improved one-step process for producing foamed rotomolded articles having foamed interiors and non-foamed exterior skins is also provided.

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patent: 4952350 (1990-08-01), Duffy
patent: 5783611 (1998-07-01), Strebel

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