Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1987-09-15
1989-05-16
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
264 53, 264DIG9, 264DIG16, 425 4R, 521134, C08J 918, C08J 922, C08J 912
Patent
active
048307980
ABSTRACT:
The present invention provides that, in a process for production of foamed articles of a polyproplene resin which comprises compressing pre-expanded beads of propylene resins under a gaseous pressure, filling a mold capable of closing but incapable of sealing with the compressed beads, then venting from the mold and heating and fusing with steam thereby to produce the molded article in the shape of the mold, the improvement wherein the pre-expanded beads of the polypropylene resins having two melting points when measured by differential scanning calorimetry and having a quantity of the peak fusion heat QH based on a melting point at a high temperature peak of the two melting points being 0.3 to 3.5 cal/g are introduced compressively into the mold so that a compressive rate is 10 to 60%. According to the present invention, the foamed articles of polypropylene having a minimized dimensional shrinkage rate (good dimensional accuracy) and excellent fusion rate and surface appearance can be produced in high productivity.
REFERENCES:
patent: 3953558 (1976-04-01), Hatano et al.
patent: 4567208 (1986-01-01), Kuwabara et al.
patent: 4631159 (1986-12-01), Maeda et al.
Muus, Laurits T.; N. Gerard McCrum; and Frank C. McGraw, "On The Relationship of Physical Properties to Structure in Linear Polymers of Ethylene and Propylene"; In SPE Journal, May, 1959, pp. 368-372.
Anderson Philip
Kanegafuchi Kagaku Kogyo & Kabushiki Kaisha
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