Expanded polypropylene resin bead and process of producing same

Details Expanded polypropylene resin bead and process of producing same Expanded polypropylene resin bead and process of producing same

2005-10-18

2005-10-18

Kuhns, Allan R. (Department: 1732)

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

Synthetic resins

Cellular products or processes of preparing a cellular...

C264S050000, C264S053000, C521S057000

Reexamination Certificate

active

06956067

ABSTRACT:
Expanded, substantially non-crosslinked polypropylene resin beads capable of producing a high rigidity foamed molding at a relatively low temperature. The beads are produced by a process including a step of dispersing substantially non-crosslinked polypropylene resin particles in a dispersing medium containing an organic peroxide to obtain a dispersion, a step of heating the dispersion to decompose the organic peroxide and to modify the surface of the surface-modified polypropylene resin particles, and a step of expanding the non-crosslinked, surface-modified polypropylene resin particles using a blowing agent.

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