Azeotropic compositions of perfluoro-1,2-dimethylcyclobutane with 1,1-dichloro-1-fluoroethane or dichlorotrifluoroethane

Claim 2

An azeotropic composition, consisting essentially of about 50 to 60 weight percent perfluoro-1,2-dimethylcyclobutane and about 40-50 weight percent 1,1-dichloro-1-fluoroethane wherein the composition boils at about 26.7° C. when the pressure is adjusted to substantially atmospheric pressure.

Claim 3

An azeotropic composition, consisting essentially of about 23 to 33 weight percent perfluoro-1,2-dimethylcyclobutane and from about 67 to 77 weight percent dichlorotrifluoroethane wherein said dichlorotrifluoroethane is 1,1-dichloro-2,2,2,-trifluoroethane or 1,1-dichloro-2,2,2-trifluomethane which contains 1,2-dichloro-1,2,2-trifluoroethane in an amount up to 5 percent, and wherein the composition boils at about 27.0° C. when the pressure is adjusted to substantially atmospheric pressure.

Claim 4

An azeotropic composition, consisting essentially of about 23 to 33 weight percent perfluoro-1,2-dimethylcyclobutane and from about 67 to 77 weight percent dichlorotrifluoroethane wherein said dichlorotrifluoroethane is 1,1-dichloro-2,2,2,-trifluoroethane or 1,1-dichloro-2,2,2-trifluomethane which contains 1,2-dichloro-1,2,2-trifluoroethane in an amount up to 5 percent, and wherein the composition boils at about 27.0° C. when the pressure is adjusted to substantially atmospheric pressure.

Claim 5

The azeotropic composition of claim 2, wherein the composition consists essentially of about 54.5 weight percent perfluoro-1,2-dimethylcyclobutane and about 45.5 weight percent 1,1-dichloro-1-fluoroethane.

Claim 6

The azeotropic composition of claim 3, wherein the composition consists essentially of about 27.7 weight percent perfluoro-1,2-dimethylcyclobutane and about 72.3 weight percent dichlorotrifluoroethane.

Claim 7

The composition of claim 2, consisting essentially of about 52 to 57 weight percent perfluoro1,2-dimethylcyclobutane and about 43 to 48 weight percent 1,1-dichloro-1-fluoroethane.

Claim 8

The composition of claim 3, consisting essentially of about 25 to 30 weight percent perfluoro-1,2,-dimethylcyclobutane and from about 70 to 75 weight percent dichlorotrifluoroethane.

Claim 9

The composition of claim 2, consisting of perfluoro-1,2-dimethylcyclobutane and 1,1-dichloro-1-fluoroethane.

Claim 10

The composition of claim 3, consisting of perfluoro-1,2-dimethylcyclobutane and dichlorotrifluoroethane.

Claim 11

A process for cleaning a solid surface which comprises treating said surface with a azeotropic composition of claim 2 or claim 3.

Claim 12

The process of claim 9, wherein the solid surface is a printed circuit board contaminated with flux and flux-residues.

Claim 13

The process of claim 9, wherein the solid surface is a metal.

Claim 14

A process for producing refrigeration which comprises evaporating a mixture of claim 2 or claim 3 in the vicinity of a body to be cooled.

Claim 15

A process for producing heat which comprises condensing a composition of claim 2 or claim 3 in the vicinity of a body to be heated.

Claim 16

In a process for preparing a polymer foam comprising expanding a polymer with a blowing agent, the improvement wherein the blowing agent is a composition of claim 2 or claim 3.

Claim 17

In an aerosol composition comprising a propellant and an active agent, the improvement wherein the propellant is a composition of claim 2 or claim 3.

Claim 18

A process for preparing aerosol formulations comprising condensing an active ingredient in an aerosol container with an effective amount of the composition of claim 2 or claim 3 as a propellant.