High productivity, low fugitive voc emission foam process

Details High productivity, low fugitive voc emission foam process High productivity, low fugitive voc emission foam process

C - Chemistry, Metallurgy

08

J

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

Patent

CA 2305777

A blowing agent for foaming polystyrene consisting essentially of at least one low permeability volatile organic compound, at least one low volatility non-volatile organic compound and, optionally, at least one high volatility non-volatile organic compound. 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 volatile organic compounds (VOC) emissions.

L'invention concerne un agent d'expansion destiné au moussage de polystyrène et comprenant essentiellement au moins un composé organique volatil (COV) à basse perméabilité, au moins un composé organique non volatil à faible volatilité et éventuellement au moins un composé organique non volatil à haute volatilité. Dans une réalisation, le composé organique volatil basse perméabilité est sélectionné dans un groupe comprenant l'isopentane et l'isobutane, le composé organique non volatil à faible volatilité est l'acétone et le composé organique non volatil à haute volatilité est le dioxyde de carbone. On peut utiliser cet agent d'expansion pour former une structure de mousse de polystyrène. Cet agent d'expansion permet de produire des émissions réduites de composés organiques volatils (COV) fugitifs.

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