Process for preparing pre-expanded particles of thermoplastic re

Details Process for preparing pre-expanded particles of thermoplastic re Process for preparing pre-expanded particles of thermoplastic re

1987-01-30

1988-05-31

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 60, 521146, C08J 922

Patent

active

047481919

ABSTRACT:
In a process for preparing pre-expanded particles of a thermoplastic resin which comprises releasing into a low pressure zone an aqueous dispersion of thermoplastic resin particles containing a volatile blowing agent, the dispersion being maintained at an elevated temperature under pressure in a pressure vessel, the improvement which comprises releasing the dispersion through an orifice having a ratio of the length to the average diameter of 4 to 100. According to the present invention, the pre-expanded particles having cells which are uniform in diameter and have an average dimeter of not less than 200 .mu.m can be obtained, and therefore the articles molded in a mold from the pre-expanded particles are small in the shrinkage and strain, are excellent in the appearance, and are increased in the productivity. Accordingly, the molded articles are utilizable for use of shock absorbing, wrapping materials or structural material such as impact-absorbing materials for cars which requires excellent dimensional precision and heat insulating building materials.

REFERENCES:
patent: 4436840 (1984-03-01), Akiyama et al.
patent: 4448901 (1984-05-01), Senda et al.
patent: 4464484 (1984-08-01), Yoshimura et al.

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