A molded article containing a crystal of a fluoropolymer. The fluoropolymer contains at least one selected from vinylidene fluoride/tetrafluoroethylene copolymer, polychlorotrifluoroethylene, an ethylene/tetrafluoroethylene copolymer, a tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer and a tetrafluoroethylene/hexafluoropropylene copolymer. Further, the crystal is a nano-oriented crystal having a size of 300 nm or smaller.

There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 3.3 to 4.2% by mass with respect to the whole of the monomer units, the melt flow rate at 372° C. of 27.0 to 35.0 g/10 min, and the number of functional groups of 20 or less per 10.sup.6 main-chain carbon atoms.

Provided is a fluorine-containing elastomer composition that contains a non-crosslinked fluorine-containing elastomer and a crosslinked perfluororesin.

Provided is a fluorine-containing elastomer composition that contains a non-crosslinked fluorine-containing elastomer and a crosslinked perfluororesin.

To provide a fluorinated elastic copolymer excellent in adhesion, processability, mechanical properties, heat resistance and chemical resistance. A fluorinated elastic copolymer having units based on a monomer (a), units based on a monomer (b) and optionally units based on a monomer (c), which has an iodine atom bonded to a terminal of a molecular chain and the unit based on the monomer (b) adjacent to the iodine atom, and which has a proportion of the units based on the monomer (b) of from 0.09 to 2.0 mol % to all units. Monomer (a): monomer selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride, chlorotrifluoroethylene, a perfluoro(alkyl vinyl ether) and 2,3,3,3-tetrafluoropropene; monomer (b): a monomer having at least one type of functional group selected from the group consisting of an epoxy group, a hydroxy group, a carbonyl group-containing group and an isocyanate group; monomer (c): a monomer selected from the group consisting of ethylene and propylene.

To provide a fluorinated elastic copolymer excellent in adhesion, processability, mechanical properties, heat resistance and chemical resistance. A fluorinated elastic copolymer having units based on a monomer (a), units based on a monomer (b) and optionally units based on a monomer (c), which has an iodine atom bonded to a terminal of a molecular chain and the unit based on the monomer (b) adjacent to the iodine atom, and which has a proportion of the units based on the monomer (b) of from 0.09 to 2.0 mol % to all units. Monomer (a): monomer selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride, chlorotrifluoroethylene, a perfluoro(alkyl vinyl ether) and 2,3,3,3-tetrafluoropropene; monomer (b): a monomer having at least one type of functional group selected from the group consisting of an epoxy group, a hydroxy group, a carbonyl group-containing group and an isocyanate group; monomer (c): a monomer selected from the group consisting of ethylene and propylene.

To provide a copolymer capable of forming a coated electrical wire excellent in engine oil resistance, a composition, a molded product, and a coated electrical wire. The copolymer of the present invention is a copolymer comprising units based on ethylene, units based on tetrafluoroethylene, and units based on compound A represented by CH═CX(CF.sub.2).sub.nY (wherein X and Y are each independently a hydrogen atom or a fluorine atom, and n is an integer of from 2 to 6) or compound B represented by CF.sub.2═CF—O—C.sub.3F.sub.7, wherein the crystal lamella thickness determined by the small angle X-ray scattering method is at most 4.0 nm and the melting point is at least 245° C.

To provide a fluororesin laminate in which a layer of a fluorinated copolymer and a layer of a propylene polymer excellent in heat resistance are strongly attached. A laminate comprising a layer which contains a fluorinated copolymer having an adhesive functional group and having monomer unit based on tetrafluoroethylene and monomer units based on ethylene, and a layer which contains a propylene polymer having an adhesive functional group.

To provide a fluorinated copolymer excellent in low temperature properties and crosslinking property as a fluororubber, and a method for producing it.

A fluorinated copolymer which has units based on tetrafluoroethylene, units based on propylene and units based on a compound represented by the following formula 1, and which has either one or both of iodine atoms and bromine atoms:

CF.sub.2═CFO(R.sup.f1O).sub.nR.sup.f2  formula 1

wherein R.sup.f1 is a C.sub.1-3 perfluoroalkylene group, R.sup.f2 is a C.sub.1-6 perfluoroalkyl group, n is an integer of from 1 to 4, and in a case where n is from 2 to 4, a plurality of R.sup.f1 may be the same or different.

To provide a fluorinated copolymer excellent in low temperature properties and crosslinking property as a fluororubber, and a method for producing it.

A fluorinated copolymer which has units based on tetrafluoroethylene, units based on propylene and units based on a compound represented by the following formula 1, and which has either one or both of iodine atoms and bromine atoms:

CF.sub.2═CFO(R.sup.f1O).sub.nR.sup.f2  formula 1

wherein R.sup.f1 is a C.sub.1-3 perfluoroalkylene group, R.sup.f2 is a C.sub.1-6 perfluoroalkyl group, n is an integer of from 1 to 4, and in a case where n is from 2 to 4, a plurality of R.sup.f1 may be the same or different.