Thermoplastic foam molding

Details Thermoplastic foam molding Thermoplastic foam molding

1983-12-12

1985-07-30

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264DIG5, 425 4R, 521131, 521133, 521134, 521139, 521187, 521189, B29D 2700

Patent

active

045320942

ABSTRACT:
A method for forming a molded thermoplastic foam structure comprising partially filling a mold with solvent imbibed particles of a thermoplastic resin, pressurizing said mold under conditions such as to prevent vaporization of said blowing agent during subsequent polymer melting, heating said polymer to a flowable state, releasing the mold pressure to permit foaming of the melt and expansion of the foamed polymer within the mold.

REFERENCES:
patent: 2744291 (1956-05-01), Stastny et al.
patent: 3162704 (1964-12-01), Attanasio et al.
patent: 3787364 (1974-01-01), Wirth et al.
patent: 4024110 (1977-05-01), Takekoshi
patent: 4284733 (1981-08-01), Russo
White, D. M.; T. Takekoshi; F. J. Williams; H. M. Relles; P. E. Donahue; H. J. Klopper; G. R. Loucks; J. S. Manello; R. O. Matthews; and R. W. Schluenz, "Polyetherimides via Nitro-Displacement Polymerizations Monomer Synthesis and .sup.13 C-NMR Analysis of Monomers and Polymers", In Journal of Polymer Science, Polymer Chemistry Edition, vol. 19, No. 7, Jul. 1981, pp. 1635-1658.
Cargile, H. M. and J. M. Tower "Melt-Processible Structural Foam Molding", in Modern Plastics Encyclopedia 1982-1983, pp. 275, 276 and 278.

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