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Polystyrene particles of uniform size, esp. for foams - by polymerising in suspension of fine polystyrene particles, contg. catalyst and polymn retarder
Polystyrene particles of uniform size, esp. for foams - by polymerising in suspension of fine polystyrene particles, contg. catalyst and polymn retarder
Polystyrene particles are prepd. by (a) suspending polystyrene particles of chosen size, with a given range, in water and (b) polymerising, by addition of styrene, a suspension polymerisation catalyst and 1/200-1/15 moles, per mole catalyst, of a polymerisation retarder of mol. wt. is not 200. Uniform polystyrene particles, esp. 0.6-3 (0.8-2.5) are obtd. Very small particles of little practical use, can be utilised as the particles initially added. Foamable polystyrene particles can be produced.
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