High productivity, low fugitive emission foams and foam...

Details High productivity, low fugitive emission foams and foam... High productivity, low fugitive emission foams and foam...

C - Chemistry, Metallurgy

08

J

C08J 9/04 (2006.01) C08J 9/12 (2006.01) C08J 9/14 (2006.01) C08J 9/18 (2006.01) C09K 5/00 (2006.01)

Patent

CA 2329989

A blowing agent for foaming polystyrene consisting essentially of at least one low permeability compound (preferably a volatile organic compound (VOC)), at least one low volatility compound (preferably a non-VOC) and, optionally, at least one high volatility compound (preferably a non-VOC). In one embodiment, the low permeability volatile organic compound is selected from the group consisting of isopentane and isobutane, the low volatility non-volatile organic compound is acetone and the high volatility non-volatile organic compound is carbon dioxide. The blowing agent of the present invention may be used to foam a polystyrene foam structure. The blowing agent is directed to achieving low fugitive VOC emissions.

L'invention concerne un agent gonflant pour faire mousser le polystyrène contenant au moins un composé à faible perméabilité (de préférence un composé organique volatile (COV)), au moins un composé à faible volatilité (de préférence non COV), et facultativement au moins un composé à forte volatilité (de préférence non COV). Selon un mode de réalisation, on sélectionne le composé organique volatile à faible perméabilité dans le groupe contenant l'isopentane et l'isobutane, le composé organique non volatile à faible volatilité étant l'acétone et le composé organique non volatile à forte volatilité étant le dioxyde de carbone. On peut utiliser l'agent gonflant de cette invention pour produire des structures moussées dans un polystyrène. Cet agent gonflant vise à produire des émissions fugitives de COV faibles.

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