Expandable polypropylene interpolymer particles

Details Expandable polypropylene interpolymer particles Expandable polypropylene interpolymer particles

1986-06-02

1987-03-03

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, 521139, 525322, 525387, 525938, 528503, C08J 918

Patent

active

046475931

ABSTRACT:
A process for producing a polypropylene-polystyrene 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 is viscbroken during the polymerization of the styrene. The polypropylene is lubricated prior to formation of the interpolymer. The process forms particles which can be impregnated with blowing agent directly.

REFERENCES:
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patent: 3743611 (1973-07-01), Muroi et al.
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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