C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 9/20 (2006.01) C08F 12/08 (2006.01)
Patent
CA 2489243
Process for the preparation of expandable vinylaromatic polymers which comprises: a) polymerizing in aqueous suspension at last one vinylaromatic monomer in the presence of a suspending agent selected from inorganic salts of phosphoric acid; b) recovering the expandable beads from the reaction container; c) washing the beads thus obtained with an aqueous solution containing 0.005-2% by weight of a non-ionic surface-active agent; d) recovering the washed beads substantially without any inorganic salt of phosphoric acid, on the surface, and drying them in a stream of air.
L'invention concerne un procédé de préparation de polymères vinylaromatiques expansibles consistant à : a) polymériser dans une suspension aqueuse au moins un monomère vinylaromatique, en présence d'un agent de suspension sélectionné parmi des sels inorganiques d'acide phosphorique ; b) récupérer les perles expansibles contenues dans le récipient réactionnel ; c) laver les perles ainsi obtenues au moyen d'une solution aqueuse contenant 0,005 à 2 % en poids d'un tensioactif non ionique ; d) récupérer les perles lavées sensiblement dépourvues de sel inorganique d'acide phosphorique à leur surface et à les sécher dans un courant d'air.
Lanfredi Roberto
Zamperlin Loris
Polimeri Europa S.p.a.
Robic
LandOfFree
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