Compositions containing 1,1,1,2-tetrafluoroethane and methyl chloride and use of these compositions
AssigneeSolvay (Societe Anonyme)
InventorsPaul Dantinne, Pierre Barthelemy, Dominique Balthasart
Life of this patent
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Abstract
A composition including from 40 to 55 mol % of 1,1,1,,2-tetrafluoroethane and from 45 to 60 mol % of methyl chloride; and a composition including from 68 to 75 mol % of 1,1,1,2-tetrafluoroethane and from 25 to 32 mol % of methyl chloride. These compositions are useful as porogenic agents for polystyrene, as refrigerating fluids, and as blowing agents for polyurethane and polyolefin foams.
Claims4
A composition consisting essentially of:
- 48 mol % of 1,1,1,2-tetrafluoroethane (.+-.-1 mol %);
- and
- 52mol % of methyl chloride, wherein the composition forms an azeotrope having a boiling point which rises to -28.5.degree. C. (.+-.-1.degree. C.) at a pressure of 101.3 kPa.
A process of making a porous polystyrene, comprising:
- including in the polystyrene a porogenic agent consisting essentially of 48 mol % of 1,1,1,2-tetrafluoroethane (.+-.-1 mol %);
- and 52 mol % of methyl chloride, which is an azeotrope having a boiling point which rises to -28.5.degree. C. (.+-.-1.degree. C.) at a pressure of 101.3 kPa.
A process for producing refrigeration, comprising:
- condensing a refrigerating fluid consisting essentially of 48 mol % of 1,1,1,2-tetrafluoroethane (.+-.-1 mol %);
- and 52 mol % of methyl chloride, which is an azeotrope having a boiling point which rises to -28.5.degree. C. (.+-.-1.degree. C.) at a pressure of 101.3 kPa;
- and
- thereafter evaporating said refrigerating fluid.
A process of producing a foam comprised of a polymer selected from the group consisting of a polyurethane and a polyolefin, comprising:
- foaming the polymer with a blowing agent consisting essentially of 48 mol % of 1,1,1,2-tetrafluoroethane (.+-.-1 mol %);
- and 52 mol % of methyl chloride, wherein the composition forms an azeotrope having a boiling point which rises to -28.5.degree. C. (.+-.-1.degree. C.) at a pressure of 101.3 kPa.
Dependencies are inferred from the claim text.