Process for producing thermoplastic polyester series resin foame

Details Process for producing thermoplastic polyester series resin foame Process for producing thermoplastic polyester series resin foame

1991-12-05

1995-02-14

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Including surface treatment of porous body

264 53, 264 54, B29C 6722

Patent

active

053893190

ABSTRACT:
A method of forming a thermoplastic polyester series foamed material having a thickness of at least 3 mm and an apparent density of from 0.05 to 0.7 g/cm.sup.3, wherein the crystallinity of the resin in the surface portion within 0.5 mm from the surface of the foamed material is not more than 30% and at least 1% lower than the crystallinity of the resin in the central portion of the foamed material.

REFERENCES:
patent: 3317363 (1967-05-01), Weber
patent: 3988403 (1976-10-01), Angell, Jr. et al.
patent: 3993265 (1976-11-01), Parks
patent: 4097421 (1978-06-01), Chang
patent: 4272475 (1981-06-01), Chi
patent: 4844944 (1989-07-01), Graefe et al.
patent: 4964935 (1990-10-01), Biggs et al.
patent: 5087514 (1992-02-01), Graefe
patent: 5128202 (1992-07-01), Subramanian et al.
patent: 5186999 (1993-02-01), Brambach

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