Method for controlling bead size in the production of expandable

Details Method for controlling bead size in the production of expandable Method for controlling bead size in the production of expandable

1984-08-27

1986-10-21

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 51, 264DIG5, 264DIG9, 264DIG15, 521 56, C08J 914, C08J 920, C08J 922, C08F 220

Patent

active

046184686

ABSTRACT:
A process for controlling bead size in the production of expandable styrene polymers by suspension polymerization is carried out by adding protective colloids to the aqueous phase before polymerization begins, such protective colloids being used which are homogeneously soluble in water over the entire temperature range from 25.degree. to 125.degree. C. and in which the concentration range being employed shall not lower the boundary surface tension water/styrene below 18 N/mm.sup.2. Lastly, the protective colloids are selected according to their molecular weight and the weight ratio of aqueous to organic phase lies in the range of 0.9:1 to 1:1.25, preferably in the range of 1:1. A grain spectrum is maintained predominantly greater than 0.41 to less than 2.5 mm by varying the molecular weights of the protective colloids.

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