Reduced voc emission alkenyl aromatic polymer foams and...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/14 (2006.01) B29C 44/20 (2006.01) C08J 9/12 (2006.01)

Patent

CA 2509683

A method for producing an alkenyl aromatic polymer foam structure that comprises melting at least one alkenyl aromatic polymer resin. An effective amount of blowing agent mixture is dissolved in the at least one alkenyl aromatic polymer. The blowing agent mixture comprises at least one VOC blowing agent and acetone. The majority by mole percent of the VOC blowing agent is selected from n-butane, iso-butane, propane and combinations thereof. An extrudate is formed comprising the at least one alkenyl aromatic polymer resin, the at least one VOC blowing agent, and acetone. The extrudate comprises less than about 2.7 wt.% of the at least one VOC blowing agent. The extrudate is transferred to an expansion zone and permitted to expand to produce the foam structure. The foam structure has an extruded density less than about 7 lbs/ft3 and a basis weight of less than about 20 grams per 100 in2.

L'invention concerne un procédé de production d'une structure de mousse de polymère aromatique alcényle, consistant à mettre en fusion au moins une résine polymère aromatique alcényle. Une quantité efficace de mélange d'agents d'expansion est dissoute dans le ou les polymères aromatiques alcényle. Ledit mélange d'agents d'expansion comprend au moins un agent d'expansion de type composé organique volatil (COV) et de l'acétone. La majorité par % en moles de l'agent d'expansion COV est choisie parmi le n-butane, l'iso-butane, le propane et des mélanges de ces composés. Un extrudat est formé, cet extrudat comprenant la ou les résines polymères aromatiques alcényle, le ou les agents d'expansion COV et l'acétone, la proportion du ou des agents d'expansion COV étant inférieure à 2,7 % en poids approximativement. Ledit extrudat est transféré dans une zone d'expansion où il est expansé pour produire la structure de mousse. Cette structure de mousse possède une densité extrudée inférieure à 7 lbs/ft?3¿ approximativement et une masse surfacique inférieure à 20 grammes par 100 in?2¿.

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