Pre-expanded particle of polyolefine and process for preparing t

Details Pre-expanded particle of polyolefine and process for preparing t Pre-expanded particle of polyolefine and process for preparing t

1984-02-29

1985-09-10

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264DIG9, 521 56, 521 60, 521142, C08J 918

Patent

active

045407185

ABSTRACT:
A pre-expanded particle suitable for foaming in a mold comprising polyolefin which has a characteristic property that an inclination of slope line obtained on a graph when logarithmic values of melt tension of the polyolefin are plotted as ordinate and reciprocals of absolute temperature at which the melt tension is measured are plotted as abscissa is less than 1,500 is provided. A foamed article produced from the pre-expanded particles has an excellent appearance, a flat surface and good mechanical strength, and is useful for wrapping material, insulating material, a container or a fender of cars.
A process for preparing the above-mentioned pre-expanded particles is also disclosed.

REFERENCES:
patent: 4168353 (1979-09-01), Kitamori
patent: 4275023 (1981-06-01), Shimizu et al.
patent: 4303756 (1981-12-01), Kajimura et al.
patent: 4366263 (1982-12-01), Sato et al.
patent: 4399087 (1983-08-01), Akiyama et al.
patent: 4415680 (1983-11-01), Ushirokawa et al.
patent: 4436840 (1984-03-01), Akiyama et al.

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