B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/673
B29C 35/04 (2006.01) C08J 9/232 (2006.01) C08L 23/10 (2006.01)
Patent
CA 1274662
Abstract of the Disclosure The present invention provides, in a process for production of foamed articles of polypropylene resin comprising pre-expanded beats of propylene resin under gaseous pressure, filling a mold capable of being closed but not sealed with the compressed beads, then venting the mold and heating the beads and fusing them with steam thereby to produce a molded article, the improvement wherein the pre-expanded beads of polypropylene resin have two melting points when measured by differntial scanning caloimetry and a peak fusion heat QH based on the melting point peak at the higher temperature of the two melting points being 0.3 to 3.5 cal/g, are introduced compressively into a mold so that the compression as defined herein is 10 to 60%. According to the present invention, foamed articles of polypropylene having minimized dimensional shrinkage (good dimensional accuracy) and excellent fusion and surface appearance can be produced at high rates of production. PAT 11415-1
546902
Borden Ladner Gervais Llp
Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
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