Process for producing expanded particles of a polyolefin resin.

摘要

A process for the preparation of expanded particles in which a mixture of water and of polyolefin resin particles, impregnated with a volatile blowing agent, is released from the interior of a pressure-resistant container under a constant temperature and constant pressure, preferably keeping the partial pressure of the blowing agent constant, through at least one orifice having an area of 0.07 to 300 mm<2>, into a low-pressure zone. This invention gives various advantages when applied industrially, giving expanded particles with superior properties which are free of blocking, showing a remarkably uniform degree of expansion, and being useful for molding.