Rotational molding process for producing foamed articles

Details Rotational molding process for producing foamed articles Rotational molding process for producing foamed articles

1999-03-04

2000-07-04

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 54, B29C 4406

Patent

active

06083434&

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: 3984511 (1976-10-01), Lammers
patent: 4533696 (1985-08-01), Schrijver et al.
patent: 4952350 (1990-08-01), Duffy

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