Process for preparing expanded product of thermoplastic resin

Details Process for preparing expanded product of thermoplastic resin Process for preparing expanded product of thermoplastic resin

1997-07-02

1998-11-03

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264 453, 264237, 264DIG13, 521 79, 521 97, 521143, B29D 2700

Patent

active

058303936

ABSTRACT:
A process for preparing an expanded product of a thermoplastic resin which includes a gas dissolving step of adding supercritical carbon dioxide and/or nitrogen as an blowing agent to a thermoplastic resin, and melting it in the thermoplastic resin, a cooling step of cooling the resulting molten resin composition under a pressure not less than a critical pressure of the blowing agent, a nuclei forming step of discharging the molten resin composition from a die to lower the pressure to a level not more than the critical pressure, and an expansion controlling step of cooling an expanded product of the thermoplastic resin to a level not more than a glass transition temperature or a crystallization temperature of the resin to control a cell diameter of the expanded product.

REFERENCES:
patent: 4473665 (1984-09-01), Martini-Vvedensky et al.
patent: 5158986 (1992-10-01), Cha et al.

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