| 摘要 |
PURPOSE:To obtain the subject composition having excellent properties of conventional fluorocarbon and able to be used as substitute of fluorocarbon and simultaneously having excellent properties as solvent, etc., by comprising 2,3- dimethylbutane and a species selected from R244cb and R235ca. CONSTITUTION:The objective composition is composed of (A) at least one fluorinated hydrocarbon selected from A1: 1-chloro-1,2,2,3-tetrafluoropropane (R244cb) and A2: 3-chloro-1,1,2,2,3-pentafluoropropane (R235ca) and (B) 2,2- dimethylbutane. An azeotropic composition composed of A1=34wt.% and B=66wt.% or A2=81wt.% and B=19wt.%, and an azeotropic-like composition composed of A1=14 to 99wt.% and B=1 to 86wt.% or A2=61 to 99wt.% and B=1 to 39wt.% are claimed. Similar composition is obtained by using mixture of 5 to 8C hydrocarbon obtained from petroleum fraction mainly composed of 2,2-dimethylbutane as the B-component. The objective composition shows no variation of composition in recycling and able to be used in the same method as conventional single fluorocarbon. |
