Expandable polypropylene interpolymer particles

Details Expandable polypropylene interpolymer particles Expandable polypropylene interpolymer particles

1986-04-07

1986-11-11

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 59, 521 60, 521 79, 521139, 264 53, C08J 918, C08J 922

Patent

active

046223479

ABSTRACT:
A process for producing a polypropylenepolystyrene interpolymer which can be impregnated with a blowing agent and can then be expanded under normal conditions for polystyrene particles to low density, fine cell structure foams. The interpolymer must be viscbroken, lubricated and stress relaxed in order to foam at 100.degree. C. to densities less than 2.0 pcf.

REFERENCES:
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patent: 3959189 (1976-05-01), Kitamori
patent: 4168353 (1979-09-01), Kitamori
patent: 4303756 (1981-12-01), Kajimura et al.
patent: 4303757 (1981-12-01), Kajimura et al.
patent: 4429059 (1984-01-01), Ozutsumi et al.

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