Expandable polypropylene interpolymer particles

Details Expandable polypropylene interpolymer particles Expandable polypropylene interpolymer particles

1986-06-20

1987-06-30

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, 521139, C08J 918

Patent

active

046771344

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 must be viscbroken, lubricated and stress relaxed in order to foam at 100.degree. C. to densities less than 2.0 pcf.

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patent: 4303756 (1981-12-01), Kajimura et al.
patent: 4303757 (1981-12-01), Kajimura et al.
patent: 4429059 (1984-01-01), Ozutsumi et al.
patent: 4622347 (1986-11-01), Fudge

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