Method for production of styrenic foam

Details Method for production of styrenic foam Method for production of styrenic foam

1992-02-06

1992-09-22

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 53, 521 79, 521 97, 521 98, 521910, C08J 908, C08J 914

Patent

active

051494736

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.

REFERENCES:
patent: 3725317 (1973-04-01), Roden
patent: 4795763 (1989-01-01), Gluck et al.
patent: 4956395 (1990-09-01), Leduc
patent: 5064869 (1991-11-01), Bopp et al.

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