Abstract: A fluororesin having excellent storage stability with a solvent and adhesion to a base material; a method of its production; a composition including the fluororesin and a solvent; and an article including the composition. The fluororesin includes a polymer having a fluorine-containing aliphatic ring structure within a main chain comprising at least one of an alkoxycarbonyl group having an alkoxy group of 1 to 3 carbon atoms and an amide group having a coupling group. An IR spectrum of a 200 ?m thick cast film of the fluororesin satisfies 0.010?B/A?0.7 where A is a local maximum absorbance at 1,780 to 1,800 cm?1, measured from a straight line connecting an absorbance at 1,700 cm?1 and an absorbance at 1,925 cm?1, and B is an absorbance at 1,720 cm?1, measured from a straight line connecting an absorbance at 1,647 cm?1 and an absorbance at 1,763 cm?1.

Abstract: A method for producing a water/oil repellent composition can produce an article which is excellent in the oil repellency while maintaining the water repellency and the heavy-rain durability. The method includes mixing an emulsion of a polymer having from 10 to 50 mass % of units based on a monomer having a perfluoroalkyl group per all units and an emulsion of a monomer component containing at least 80 mass % of a monomer having a perfluoroalkyl group so that the proportion of the mass of the polymer will be from 50 to 99 mass % per the sum of the mass of the polymer and the total mass of the monomer component and then polymerizing the monomer component. The monomer component includes emulsified particles in the emulsion of the monomer component. The emulsified particles have an average particle size of from 50 to 600 nm.

Abstract: To provide a water/oil repellent article which presents little burden on the environment, while being excellent in water/oil repellency, washing durability of the water repellency and friction durability of the water repellency; a method for producing such a water/oil repellent article; and a water/oil repellent composition and a water/oil repellent kit to be used for producing such a water/oil repellent article.

Abstract: A water/oil repellent composition which can provide an article with high and durable water repellency is provided. A water/oil repellent composition comprising units based on a fluoroolefin represented by the formula (1): CH2?CH—Rf (wherein Rf is a C1-8 perfluoroalkyl group), units based on a vinyl carboxylate (b1) having a C12 or higher alkyl group and units based on a vinyl carboxylate (b2) having a C1-6 alkyl group, wherein the ratio of units based on the fluoroolefin is from 20 to 35 mol %, the ratio of units based on the vinyl carboxylate (b1) is from 30 to 70 mol %, and the ratio of units based on the vinyl carboxylate (b2) is from 5 to 50 mol %, relative to all the units in the fluorinated polymer.

Abstract: A water/oil repellent composition which can provide an article with high and durable water repellency is provided.

Abstract: To provide a method for producing a water/oil repellent composition, whereby an article which is excellent in the oil repellency while maintaining the water repellency and the heavy-rain durability, can be produced. A method for producing a water/oil repellent composition, which comprises mixing an emulsion of a polymer having from 10 to 50 mass % of units based on a monomer having a perfluoroalkyl group per all units and an emulsion of a monomer component containing at least 80 mass % of a monomer having a perfluoroalkyl group so that the proportion of the mass of the polymer will be from 50 to 99 mass % per the sum of the mass of the polymer and the total mass of the monomer component and then polymerizing the monomer component.

Abstract: To provide a water/oil repellent article which presents little burden on the environment, while being excellent in water/oil repellency, washing durability of the water repellency and friction durability of the water repellency; a method for producing such a water/oil repellent article; and a water/oil repellent composition and a water/oil repellent kit to be used for producing such a water/oil repellent article.