Hydrofluorocarbon compositions as blowing agents for cellular pl

Details Hydrofluorocarbon compositions as blowing agents for cellular pl Hydrofluorocarbon compositions as blowing agents for cellular pl

1993-10-04

1994-05-24

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 53, 264DIG5, 521131, 521910, C08J 914

Patent

active

053149262

ABSTRACT:
Blowing agents for use in foamable plastics such as polystyrene, polyvinyl chloride, polyethylene and other non-polyisocyanate-based foams, comprising a mixture of 1,1,1,2,3,3,3-heptafluoropropane in combination with one or more hydrocarbons or partially halogenated alkanes. In one aspect of the invention the hydrocarbon adjuvant is selected from the group consisting of propane, butane, isobutane, n-pentane, i-pentane, neopentane, n-hexane, 2-methylpentane, 3-methylpentane and 2,2-dimethylbutane. In another aspect of the invention the halogenated alkane is selected from the group consisting of ethyl chloride, 2,2-dichloro-1,1,1-trifluoroethane (HCFC-123), 1,1-dichloro-l-fluoroethane (HCFC-141b), 1-chloro-1,1-difluoroethane (HCFC-142b), 2-chloro-1,1,1,2 -tetrafluoroethane (HCFC-124), 3,3-dichloro-1,1,1,2,2-pentafluoropropane (HCFC-225ca), 1,3-dichloro-1,1,2,2,3-pentafluoropropane (HCFC-225cb), 1,1-difluoroethane (HFC-152a), 1,1,1-trifluoroethane (HFC-143a), 1,1,1,2-tetrafluoroethane (HFC-134a), 1,1,2,2-tetrafluoroethane (HFC-134), 1,1,2,2,3-pentafluoropropane (HFC-245ca), 1,1,1,2,3,3-hexafluoropropane (HFC-236ea), and 1,2,3,3-pentafluoropropane (HFC-245ea).

REFERENCES:
patent: 3725317 (1973-04-01), Ronden et al.
patent: 5084487 (1992-01-01), Becker et al.
patent: 5182040 (1993-01-01), Bartlett et al.
patent: 5187206 (1993-02-01), Volkert et al.
patent: 5205956 (1993-04-01), Volkert et al.
patent: 5221492 (1993-06-01), Bartlett

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