Vinylidene chloride type resin expandable particles, foam partic

Details Vinylidene chloride type resin expandable particles, foam partic Vinylidene chloride type resin expandable particles, foam partic

1984-12-05

1985-10-29

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264DIG5, 264DIG9, 264DIG15, 425 4R, 521 58, 521 60, 521145, B29H 720, C08J 918

Patent

active

045500037

ABSTRACT:
This invention discloses a vinylidene chloride resin type in-mold foam molding having a broad cross-sectional area and a free shape, useful as thermal insulating plate materials or anti-shock molded vessels, and foam particles or expandable particles convenient for preparation thereof, and also a series of advantageous foaming techniques for completion of such a molding. The above foam molding can be prepared by bringing fine particles of a non-crystalline vinylidene chloride type resin obtained generally by suspension polymerization into contact with a volatile organic blowing agent thereby impregnating the resins with the blowing agent to form expandable resin particles, which are in turn subjected to expansion as such, or after forming into pre-expanded foam particles including expandable gas therein, by filling in a mold cavity which can be closed but not sealed, under heating to form a molding through fusion mutually between the expanded particles.

REFERENCES:
patent: 3615972 (1971-10-01), Morehouse, Jr. et al.
patent: 3983080 (1976-09-01), Suh et al.
patent: 4075138 (1978-02-01), Garner
patent: 4477599 (1984-10-01), Otsu et al.

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