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

1986-05-07

1988-11-15

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 53, 521 58, 521145, C08J 922, C08J 918, B29H 720

Patent

active

047850248

ABSTRACT:
The present invention discloses a vinylidene chloride resin type in-mold foam molding having a broad cross-sectional area and a free shape, which is useful as thermal insulating plate materials or as anti-shock molded vessels, and also to foam particles or expandable particles which are convenient for the preparation thereof. The present invention is also related to a series of advantageous foaming techniques for completion of such a molding. The above foam molding can be prepared by contacting fine particles of a non-crystalline vinylidene chloride type resin obtained generally by suspension polymerization 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 a mutual fusion between the expanded particles.

REFERENCES:
patent: 3615972 (1971-10-01), Morehouse, Jr. et al.
patent: 3983080 (1976-09-01), Suh et al.
patent: 4137198 (1979-01-01), Sachs
patent: 4252910 (1981-02-01), Schaefer
patent: 4477599 (1984-10-01), Otsu et al.
patent: 4480053 (1984-10-01), Sherno
patent: 4550003 (1985-10-01), Sakata et al.
patent: 4613626 (1986-09-01), Sakata et al.

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