Abstract: To provide a coating composition containing a fluorinated copolymer having repeating units derived from ethylene and tetrafluoroethylene, which can be formed into a coating film by coating and which can be produced at a relatively low temperature, and a process for its production, and a process for forming a coating film of the fluorinated copolymer by using this composition, which can be carried out at a relatively low temperature. A coating composition comprising microparticles of a fluorinated copolymer (ETFE) having repeating units derived from ethylene and repeating units derived from tetrafluoroethylene, and a solvent capable of dissolving ETFE at a temperature of not higher than the melting point of ETFE, wherein the microparticles of ETFE are microparticles precipitated from a solution having ETFE dissolved in the solvent, and are dispersed in the solvent.

Abstract: A novel prostaglandin I.sub.2 derivative selected from a prostaglandin I.sub.2 having a halogen atom on the carbon atom corresponding to the 7-position of natural prostaglandin I.sub.2 and having a cycloalkylene group in the .alpha.-chain, and its esters and salts.