Process for producing foamed particles of propylene copolymer re

Details Process for producing foamed particles of propylene copolymer re Process for producing foamed particles of propylene copolymer re

1986-08-22

1987-08-25

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 56, 521 58, C08J 918

Patent

active

046893512

ABSTRACT:
A process for producing propylene random copolymer resin foamed particles is disclosed. The process comprises dispersing propylene-ethylene random copolymer resin particles having an ethylene content of from 1 to 12% by weight in water in a closed vessel, feeding an inorganic gas into the closed vessel to raise the pressure within the closed vessel to at least 5 Kg/cm.sup.2 G, heating the dispersion to a temperature above the melting point of said copolymer resin particles but not higher than that by 25.degree. C. or more, opening a discharge port provided in the closed vessel below the water surface, and releasing the copolymer resin particles together with water as a dispersing medium into an atmosphere having a lower pressure than in the closed vessel. A foamed product produced by molding the foamed particles has firm bondage among the particles and excellent mechanical strength.

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patent: 4524154 (1985-06-01), Maeda et al.
patent: 4525485 (1985-06-01), Maeda et al.

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