Compositions of difluoromethane, pentafluoroethane, 1,1,1,2-tetrafluoroethane and hydrocarbons

  • US 6,783,691 B1
  • Filed: 03/20/2000
  • Issued: 08/31/2004
  • Est. Priority Date: 03/22/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. A nonflammable, azeotrope-like composition consisting essentially of from about 1 to about 19 weight percent difluoromethane (HFC-32), from about 25 to about 60 weight percent pentafluoroethane (HFC-125), from about 24 to about 60 weight percent 1,1,1,2-tetrafluoroethane (HFC-134a) and from about 0.5 to about 5 weight percent of a hydrocarbon selected from the group consisting of:

  • n-butane;


    n-butane and 2-methylbutane;

    n-butane and n-pentane;

    isobutane and 2-methylbutane; and

    isobutane and n-pentane.

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