Production method of foamed polypropylene resin beads

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

Reexamination Certificate

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C264S050000, C264S053000

Reexamination Certificate

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06838488

ABSTRACT:
A method for producing expanded polypropylene resin particles wherein polypropylene resin particles impregnated with a physical blowing agent are heated along with an aqueous medium and a dispersant and are released and expanded at reduced pressure from the interior of a pressure-tight vessel, wherein the aforementioned aqueous medium has an electrical conductivity of from not less than 0.00 ms/m to not more than 20.00 mS/m. The resulting particles obtained are without inconsistencies caused by differences in the amount of dispersant adhering to the particles or the amount of dispersant added to prevent the particles from fusing together during the heat treatment step of the method.

REFERENCES:
patent: 4618468 (1986-10-01), Rigler et al.
patent: 4676939 (1987-06-01), Kuwabara
patent: 5340841 (1994-08-01), Tokoro et al.
patent: 6034144 (2000-03-01), Shioya et al.
patent: 6077875 (2000-06-01), Sasaki et al.
patent: 6130266 (2000-10-01), Mihayashi et al.
patent: 6313184 (2001-11-01), Sasaki et al.
patent: 52-76372 (1977-06-01), None
patent: 59-172532 (1984-09-01), None
patent: 10-060148 (1998-03-01), None
patent: 2001-164024 (2001-06-01), None

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