The present invention relates to a method of producing a polymer including: polymerizing a compound represented by the following formula (3); or copolymerizing the compound represented by the following formula (3) with a compound (6) having a reactive carbon-carbon double bond and differing from the compound represented by the following formula (3), in a presence of at least one compound selected from the group consisting of compounds represented by the following formula (1) and compounds represented by the following formula (2).

A polydifluoroacetylene containing a CC bond and a CF bond, the polydifluoroacetylene having a solubility of 0.2 g/10 g or less in dimethylformamide (DMF) at 25 C. Also disclosed is a method for producing the polydifluoroacetylene, a precursor polymer for providing the polydifluoroacetylene, a molded article including the polydifluoroacetylene and a polydifluoroacetylene powder.

A polydifluoroacetylene containing a CC bond and a CF bond, the polydifluoroacetylene having a solubility of 0.2 g/10 g or less in dimethylformamide (DMF) at 25 C. Also disclosed is a method for producing the polydifluoroacetylene, a precursor polymer for providing the polydifluoroacetylene, a molded article including the polydifluoroacetylene and a polydifluoroacetylene powder.

The invention pertains to a method of making fluoropolymer dispersions using certain polyfunctional perfluoropolyether derivatives including a plurality of ionisable groups selected from the group consisting of SO.sub.3X.sub.a, PO.sub.3X.sub.a and COOX.sub.a, whereas X.sub.a is H, an ammonium group or a monovalent metal, and whereas said groups are comprised as pendant groups in the perfluoropolyether chain, and to fluoropolymer dispersions therefrom.

An adhesive composition includes a coupling agent composed of a compound having a first functional group that reacts with an inorganic material and a second functional group that reacts with an organic material, and a crosslinking agent capable of crosslinking with a crosslinking site of a fluorine-based elastomer. A seal structure body includes a metallic support, fluorine-based elastomer and adhesive composition that causes fluorine-based elastomer to adhere to metallic support. A method for manufacturing seal structure body includes the steps of providing metallic support and fluorine-based elastomer, and causing fluorine-based elastomer to adhere to metallic support by using adhesive composition. Accordingly, an adhesive composition with high adhesion strength as well as a seal structure body and a method for manufacturing the same are provided at low cost.

To provide a process for producing a fluorinated polymer having a cyclic structure at a relatively low cost, by efficiently recovering, from a mixture containing a fluorinated polymer obtained by polymerizing a perfluoromonomer having a cyclic structure and an unreacted perfluoromonomer having a cyclic structure, the unreacted perfluoromonomer having a cyclic structure. A monomer component containing a perfluoromonomer having a specific cyclic structure is polymerized in the presence of a polymerization initiator at a predetermined polymerization temperature to obtain a mixture containing a fluorinated polymer and an unreacted cyclic structure monomer, and the perfluoromonomer having a cyclic structure is recovered from the mixture at a temperature of at most the maximum ultimate temperature of the polymerization temperature+12 C. and at most the 10 hour half-life temperature of the polymerization initiator+12 C. under a pressure of less than the atmospheric pressure.

To provide a charge transport layer excellent in the external quantum efficiency, and an organic photoelectronic element comprising the charge transport layer. A charge transport layer comprising a film containing a fluorinated polymer and a semiconductor material, wherein the film has a material composition such that E.sub.th is within a range of from 0.010 to 0.080 MV/cm. An organic photoelectronic element comprising the charge transport layer.

The present invention relates to a method of producing a polymer including: polymerizing a compound represented by the following formula (3); or copolymerizing the compound represented by the following formula (3) with a compound (6) having a reactive carbon-carbon double bond and differing from the compound represented by the following formula (3), in a presence of at least one compound selected from the group consisting of compounds represented by the following formula (1) and compounds represented by the following formula (2).

The present invention is directed to partially fluorinated copolymers and the production thereof. More specifically, the copolymers, which are preferably produced by a solution polymerization process, preferably have at least three units, the first unit selected from 2,3,3,3-tetrafluoropropene and 1,3,3,3-tetrafluoropropene, the second unit having a polymerized monomer selected from the vinyl esters and vinyl ethers, and the third unit having a polymerized monomer derived from a hydroxyl group-containing vinyl ether. The resulting copolymer is environmentally friendly, has favorable molecular weight characteristics, and may be shipped economically in high concentration.

To provide a method for producing a perfluorinated compound, capable of easily producing a perfluorinated compound from which a high molecular weight polymer can be produced by a polymerization reaction, and a method for producing a fluorinated polymer using it.

A method for producing a perfluorinated compound, which comprises step A of reacting a perfluoroalkoxide salt with a perfluoroallylating agent to obtain a crude product A containing a perfluoroallyl ether compound, or step B of subjecting a chlorofluorocarbon compound to dechlorination reaction to obtain a crude product B containing a perfluorinated ?-olefin compound, to obtain a crude product X which is either the crude product A or the crude product B, and mixing the crude product X with a radical source to bring radicals generated by the radical source and the crude product X into contact with each other to obtain a crude product Y containing a perfluorinated compound which is either the perfluoroallyl ether compound or the perfluorinated ?-olefin compound.