Production of foamed low-density polypropylene by rotational mol

Details Production of foamed low-density polypropylene by rotational mol Production of foamed low-density polypropylene by rotational mol

1999-06-02

2000-08-15

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 54, 264 455, 521 51, 521142, 521143, B29D 900, C08J 934

Patent

active

061031534

ABSTRACT:
Compositions and processing conditions are disclosed for the production by rotomolding of polypropylene foams, hither to satisfactorily produced only by injection molding and extrusion molding. Rheological properties of the polypropylene resin, processing conditions and choice of composition of the chemical blowing agent were found to play important roles in obtaining high quality polypropylene foam structures. High strength fine-cell polypropylene foams could in particular be formed by first melt compounding a suitable chemical blowing agent with the resin under conditions which allow for homogeneous mixing without appreciable decomposition of the blowing agent.

REFERENCES:
patent: 3962390 (1976-06-01), Mori et al.
patent: 4440899 (1984-04-01), Peerkamp
patent: 5532055 (1996-07-01), Igrashi et al.
patent: 5783601 (1998-07-01), Strebel
patent: 5830392 (1998-11-01), Strebel
patent: 5928584 (1999-07-01), Lee

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