Process of producing thermoplastic polyester series resin foamed

Details Process of producing thermoplastic polyester series resin foamed Process of producing thermoplastic polyester series resin foamed

1991-02-15

1993-08-10

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 53, 264 54, 264321, 521 79, 521182, B29C 6722

Patent

active

052346404

ABSTRACT:
A process of producing a thermoplastic polyester series resin foamed material is disclosed, which comprises heating and further foaming a thermoplastic polyester resin foamed material having a crystallinity of not higher than 30% by bringing it into contact with water or steam of at least 60.degree. C. and then heating the foamed material by bringing it into contact with a heating medium other than water of at least 100.degree. C. to further foam the foamed material. A process of producing a thermoplastic polyester series resin foamed material is also disclosed, which comprises heating and further foaming a thermoplastic polyester series resin foamed material having a crystallinity of not higher than 30% by bringing it into contact with water or steam of at least 60.degree. C., heating and further foaming the foamed material by bringing it into contact with a heating medium other than water of at least 100.degree. C., and molding the foamed material by a mold.

REFERENCES:
patent: 3342922 (1967-09-01), Karpovich et al.
patent: 4230759 (1980-10-01), Kauffman et al.
patent: 4360484 (1982-11-01), Rubens
patent: 4420448 (1983-12-01), Krutchen
patent: 4462947 (1984-07-01), Huggard
patent: 4466933 (1984-08-01), Huggard
patent: 4585605 (1986-04-01), Kadota et al.

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