Process for producing expandable beads of vinyl aromatic polymer

Details Process for producing expandable beads of vinyl aromatic polymer Process for producing expandable beads of vinyl aromatic polymer

1978-05-18

1979-05-08

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 57, 521 88, 521905, 521911, C08V 918

Patent

active

041537637

ABSTRACT:
Disclosed is a process for producing expandable beads of vinyl aromatic polymer resin which provide cellular materials having a smaller and more uniform cell size, comprising the steps of suspension polymerizing beads of the vinyl aromatic polymer resin, and impregnating the beads while in suspension with a liquid blowing agent in the presence of an emulsifier comprising a diethanolamide of a fatty acid containing from 12 to 20 carbon atoms, and having a hydrophilic-lipophilic balance lower than 15.

REFERENCES:
patent: 3389097 (1968-06-01), Ingram et al.
patent: 3429737 (1969-02-01), Marsden et al.
patent: 3520833 (1970-07-01), Wright
patent: 3526605 (1970-09-01), Ingram
patent: 3560414 (1971-02-01), Miskel, Jr. et al.
patent: 3637538 (1972-01-01), Heald
patent: 3789028 (1974-01-01), Heiskel et al.

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