20250206904. Method Producing Polypropy (JSP)
METHOD FOR PRODUCING POLYPROPYLENE-BASED RESIN EXPANDED BEADS AND POLYPROPYLENE-BASED RESIN EXPANDED BEADS
Abstract: a method for producing polypropylene-based resin expanded beads includes dispersion, blowing agent impregnation, and foaming steps. beads used in the dispersion step include a core layer having a polypropylene-based resin as a base material resin, and a fusion-bonding layer covering core layer; the beads fusion-bonding layer includes carbon black and a nor-type hindered amine; a carbon black blending ratio is adjusted to 0.5 wt % or more and 5 wt % or less; and an amine blending ratio of the beads is adjusted to 0.03 wt % or more and 0.5 wt % or less; the polypropylene-based resin expanded beads have a surface on which a fusion-bonding layer is located; the fusion-bonding layer includes the carbon black and hindered amine; a carbon black blending ratio is 0.5 wt % or more and 5 wt % or less; and a blending ratio of the hindered amine is 0.03 wt % or more and 0.5 wt % or less.
Inventor(s): Tokunobu NOHARA, Yasutaka ODE
CPC Classification: C08J9/18 (WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES , , , or (working, e.g. shaping, of plastics ))
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