Process for the preparation of expanded polyvinylarene...

Details Process for the preparation of expanded polyvinylarene... Process for the preparation of expanded polyvinylarene...

C - Chemistry, Metallurgy

08

J

C08J 9/22 (2006.01) C08J 9/228 (2006.01) C08L 25/04 (2006.01)

Patent

CA 2341274

Process for the preparation of expanded polyvinylarene particles in which polyvinylarene particles pre-expanded to an apparent density do ranging between 600 and 200 kg/m3 are impregnated by an inorganic gas, and the impregnated particles thus obtained are expanded to an apparent density of at least three times lower than do.

L'invention concerne un procédé de préparation de particules de polyvinylarène expansées, le procédé consistant à imprégner avec un gaz inorganique des particules de polyvinylarène préexpansées jusqu'à ce qu'elles présentent une densité apparente d¿o? comprise entre 600 et 200 kg/m?3¿, les particules imprégnées ainsi obtenues étant expansées jusqu'à ce qu'elles présentent une densité apparente au moins trois fois inférieure à d¿o?.

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