Expanded particulate material of polyolefin resin

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

1980-03-05

1981-01-27

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 51, 264DIG9, 521 58, 521 60, 521 96, 521143, 521144, C08J 916, C08J 922

Patent

active

042476500

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: 3616365 (1971-10-01), Stastny et al.
patent: 3709806 (1973-01-01), Minami et al.
patent: 3743611 (1973-07-01), Muroi et al.
patent: 3823213 (1974-07-01), Stastny et al.
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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