Polypropylene resin pre-expanded beads, manufacturing method the

Details Polypropylene resin pre-expanded beads, manufacturing method the Polypropylene resin pre-expanded beads, manufacturing method the

1988-12-09

1990-06-05

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 56, 521 60, 521143, C08J 922

Patent

active

049314777

ABSTRACT:
The present invention provides polypropylene resin pre-expanded beads formed by shrinking polypropylene resin pre-expanded beads originally having a bulk density of not higher than 0.0930 g/cc to give then a bulk volume ratio of 10-75% at the normal temperature and the normal pressure, a manufacturing method thereof and an expansion-molding method with the aforementioned pre-expanded beads. According to this invention, it is possible to greatly reduce storing and transporting costs per unit weight of pre-expanded beads.

REFERENCES:
patent: 4399087 (1983-08-01), Akiyama et al.
patent: 4436840 (1984-03-01), Akiyama et al.
patent: 4443393 (1984-04-01), Akiyama et al.
patent: 4483809 (1984-11-01), Ando et al.
patent: 4727093 (1988-02-01), Allen et al.

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