Process for the production of expandable particles of...

C - Chemistry – Metallurgy – 08 – J

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C08J 9/16 (2006.01) C08J 9/20 (2006.01) C08J 9/22 (2006.01) C08J 9/224 (2006.01)

Patent

CA 2224900

Process for the production of expandable particles of styrene polymers, having improved processability characteristics, which comprises: i) producing expandable particles of styrene polymers containing from 2 to 20% of an expanding agent incorporated; ii) covering these particles with an antistatic agent in a quantity of less than 1% by weight; iii) vigorously frictioning the particles in a mixing apparatus in order to heat their surface, in a short time, by simple mechanical friction; iv) discharging the particles thus treated from the mixing apparatus.

Procédé pour la production de particules expansibles de polymères de styrène ayant des caractéristiques améliorées d'aptitude au traitement, lequel consiste à faire ce qui suit: i) produire des particules expansibles de polymères de styrène contenant de 2 à 20 % d'un agent d'expansion incorporé; ii) couvrir ces particules d'un agent antistatique en quantité inférieure à 1 % en poids; iii) soumettre les particules à un frottement vigoureux dans un appareil malaxeur pour en chauffer la surface pendant une courte période par simple frottement mécanique; iv) évacuer les particules ainsi traitées de l'appareil malaxeur.

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