Importance

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Abstract

The invention comprises a method for the production of insulating styrenic foams comprising use of a blowing agent comprising a C.sub.4 -C.sub.5 alkane, CO.sub.2 and a halogenated ethane selected from the group consisting of 1,1,1-trifuluoroethane, 1-chloro-1, 1-difluoroethane and 1,1,1,2-tetrafluoroethane and mixtures thereof, wherein the halogenated ethane amount is less than 70.0 wt. % of the total blowing agent weight. The invention further comprises the styrenic foams made using the blowing agent composition and a paraffin wax. The method of the invention advantageously eliminates ethylchloride from styrenic foam production methods while limiting use of the halogenated ethane to minimum amounts suitable to produce foams with good insulative properties.

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First Claim