Production of low density polypropylene foam

Details Production of low density polypropylene foam Production of low density polypropylene foam

1988-09-12

1990-07-10

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 79, 521 81, 521134, 521143, 521910, 525240, C08J 914

Patent

active

049407368

ABSTRACT:
A method of producing a foamed product having a density less than 0.2 g/cm.sup.3, which comprises foaming a composition comprising a major proportion of a low viscosity polypropylene component having a melt viscosity (at 190.degree. C. and a shear rate of 1000 sec.sup.-1) of less than 2.times.10.sup.3 poise and a minor proportion of a high viscosity polypropylene component having a melt viscosity (at 190.degree. C. and a shear rate of 1000 sec.sup.-1) of greater than 2.5.times.10.sup.3 poise.

REFERENCES:
patent: 3607796 (1971-09-01), Eberle et al.
patent: 3846349 (1974-11-01), Harada et al.

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