Abstract: The present invention provides a fluorinecontaining copolymer comprising at least one fluoroolefin and at least one cyclic unsaturated compound represented by the formulas (I) and (II) ##STR1## wherein each of n and m is 0 or a positive integer and preferably 0 or an integer of from 1 to 3, l is an integer of 3 or more than 3 and preferably 3 or 4, and R.sup.1 to R.sup.10 are the same or different and each represents a hydrogen atom, a halogen atom, a hydrocarbon group or a substituted hydrocarbon group and a method of preparing the same; and a fluorine-containing copolymer comprising at least one fluoroolefin, at least one cyclic unsaturated compound selected from the compounds of the above formulas (I) and (II) and at least one of mono and diolefins and a method of preparing the same.

Abstract: This invention provides a fluorine-containing copolymer comprising:(a) 50 to 85 mole % of a structural unit represented by the formula--CH.sub.2 --CF.sub.2--,(b) 5 to 40 mole % of a structural unit represented by the formula--CF.sub.

Abstract: The present invention provides a fluorine-containing copolymer comprising at least one fluoroolefin and at least one cyclic unsaturated compound represented by the formulas (I) and (II) ##STR1## wherein each of n and m is 0 or a positive integer and preferably 0 or an integer of from 1 to 3, l is an integer of 3 or more than 3 and preferably 3 or 4, and R.sup.1 to R.sup.10 are the same or different and each represents a hydrogen atom, a halogen atom, a hydrocarbon group or a substituted hydrocarbon group and a method of preparing the same; and a fluorine-containing copolymer comprising at least one fluoroolefin, at least one cyclic unsaturated compound selected from the compounds of the above formulas (I) and (II) and at least one of mono and diolefins and a method of preparing the same.

Abstract: The present invention is directed to a liquid separating apparatus comprising a primary chamber on the high pressure side to which the given mixed liquids containing the liquid to be separated and the other liquid are fed, and a secondary chamber on a low side which comes into contact with the primary chamber through the selective transmission separation membrane for liquid separating use, and heating pipes which heats the mixed liquids to be fed so as to raise the temperature thereof, and simultaneously, and interrupts the flow of the mixture liquids.