Polystyrene particles of uniform size, esp. for foams - by polymerising in suspension of fine polystyrene particles, contg. catalyst and polymn retarder

摘要

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.