Expanded particulate material of polyolefin resin

Details Expanded particulate material of polyolefin resin Expanded particulate material of polyolefin resin

1980-08-11

1981-06-23

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264 53, 264DIG9, 264DIG18, 521 56, 521 58, 521 60, 521 96, 521143, C08J 922

Patent

active

042750237

ABSTRACT:
Expanded particles of a crosslinked polyolefin resin, each particle with uniformly spherical shape, having an average diameter of 1.4 to 5.5 mm, an average expansion ratio of 18 to 37 and specific compression coefficient of 1.6 .times. 10.sup.-3 to 4.0 .times. 10.sup.-3, are found to be produced by two-step foaming operations. They are useful for various purposes such as filtrating material, fillers in stuffed specimens and, especially for preparation of molded articles having constricted portions, giving excellent moldings having smooth surface without failure at corner or edge portions.

REFERENCES:
patent: 2948664 (1960-08-01), Rubens
patent: 3504068 (1970-03-01), Zizlsperger
patent: 3616365 (1971-10-01), Stastuy et al.
patent: 3709806 (1973-01-01), Minami et al.
patent: 3743611 (1973-07-01), Muroi et al.
patent: 3823213 (1974-07-01), Stastuy et al.
patent: 3853972 (1974-10-01), Berner
patent: 3886100 (1975-05-01), Yasuda et al.
patent: 3953558 (1976-04-01), Hatano et al.
patent: 3959189 (1976-05-01), Kitamori
patent: 4108934 (1978-08-01), Rubens et al.

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