Process for the manufacture of halogen-containing resin particle

Details Process for the manufacture of halogen-containing resin particle Process for the manufacture of halogen-containing resin particle

1981-01-12

1983-07-05

Welsh, Maurice J.

Plastic and nonmetallic article shaping or treating: processes

Spheroidizing or rounding of solid particles

528488, 528490, B29C 2300

Patent

active

043917631

ABSTRACT:
This invention relates to a compactingly processing method for the manufacture of spherical particles, having a heavier apparent specific gravity, of halogen-containing ethylene resin. In this method, 100 wt. parts of particles of the resin are mixed with 20-500 wt. parts of one or more of heat-resisting inorganic salts having particle sizes of 0.01-50.mu.. This mixture is subjected to a heat treatment in a gaseous phase at a temperature higher than the melting point of the resin, and then, the once added inorganic salt or salts is/are separated from the heat-treated intermediate products. In this way, the resin particles are subjected to a substantial compacting and size reduction.

REFERENCES:
patent: 4069291 (1978-01-01), Kidoh et al.
patent: 4221554 (1980-09-01), Oguchi et al.

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