Process for preparing pre-expanded particles of polyolefin resin

Details Process for preparing pre-expanded particles of polyolefin resin Process for preparing pre-expanded particles of polyolefin resin

1989-12-26

1992-06-02

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264140, B29C 6722

Patent

active

051184567

ABSTRACT:
An improved process for preparing pre-expanded particles of a polyolefin resin, wherein polyolefin resin particles are dispersed in water in a pressure vessel, the particles are impregnated with a volatile blowing agent which is butane containing not less than 70 percent by weight of isobutane, the temperature of the mixture of particles in water is elevated to a temperature close to the melting point of the particles under a pressure equal to or higher than the vapor pressure of the blowing agent, and the mixture is released into a low pressure zone. The obtained pre-expanded particles are not fused together or adhered to each other, and are not shrunken. Environmental damage, such as destruction of the ozone layer, is avoided since fluorochlorocarbon is not used as a blowing agent.

REFERENCES:
patent: 3542715 (1970-11-01), White et al.
patent: 4054625 (1977-10-01), Kozlowski et al.
patent: 4694026 (1987-09-01), Park
patent: 4694027 (1987-09-01), Park
Chemical Abstracts, vol. 87, No. 2, 1977, Abstract No. 6966n.

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