Abstract:
To provide a curable composition capable of obtaining a cured product excellent in outer appearance and abrasion resistance; a cured product excellent in outer appearance and abrasion resistance; a prepreg capable of obtaining a fiber-reinforced molded product excellent in outer appearance and abrasion resistance; and a fiber-reinforced molded product excellent in outer appearance and abrasion resistance. The curable composition comprises a thermosetting resin, a fluororesin powder and a curing agent, wherein the fluororesin powder is made of a resin material containing a melt-moldable fluororesin having a melting point of from 100 to 325° C. and having functional groups of at least one type selected from the group consisting of carbonyl group-containing groups, hydroxy groups, epoxy groups and isocyanate groups, and in 100 mass % of the total of the thermosetting resin and the fluororesin powder, the proportion of the thermosetting resin is from 70.0 to 99.9 mass % and the proportion of the fluororesin powder is from 0.1 to 30 mass %.
Abstract:
To provide a fluororesin composition excellent in elongation deformability and excellent in mechanical strength of its molded product. The fluororesin composition comprises: a copolymer (A) comprising units derived from a monomer (a), units derived from a monomer (b) and units derived from a monomer (c); and a copolymer (B) comprising units derived from the monomer (a) and units derived from the monomer (b) but containing substantially no units derived from the monomer (c). In the copolymer (A), the molar ratio of units derived from the monomer (a) to units derived from the monomer (b) is from 20/80 to 80/20; the proportion of units derived from the monomer (c) to all units is from 0.2 to 3 mol %; MFR is at most 0.5 dg/min; the proportion of the copolymer (A) to the total of the copolymer (A) and the copolymer (B) is from 4 to 30 mass %; and fish eyes are present in an amount of less than 200 fish eyes per square meter. Monomer (a): tetrafluoroethylene; Monomer (b): ethylene; Monomer (c): a monomer containing two or more polymerizable carbon-carbon double bond.
Abstract:
To provide an insulated electric wire having an insulating layer comprising PFA, which is excellent in the abrasion resistance without increasing the thickness of the insulating layer. An insulated electric wire comprising a conductor and an insulating layer covering the conductor, wherein the insulating layer comprises a fluorinated copolymer (A) having units based on tetrafluoroethylene and units based on a perfluoroalkyl vinyl ether, the content of the units based on a perfluoroalkyl vinyl ether is from 0.1 to 1.9 mol % to the total units in the fluorinated copolymer (A); MRF of the fluorinated copolymer (A) as measured by the method in accordance with ASTM D-3307 is at least 0.1 and less than 15; the melting point of the fluorinated copolymer (A) is at least 260° C.; and the ratio of the thickness Di of the insulating layer to the diameter Dc of the conductor (Di/Dc) is less than 0.5.
Abstract:
To provide a process for producing an ethylene/tetrafluoroethylene copolymer composition which is excellent in mechanical properties of the molded product and which has good moldability. A process for producing a fluorinated copolymer composition, which comprises heating a mixture comprising ethylene/tetrafluoroethylene copolymers having extremely different viscosities and a solvent capable of dissolving the ethylene/tetrafluoroethylene copolymers at a temperature not higher than the melting points of the ethylene/tetrafluoroethylene copolymers, to at least a temperature where the ethylene/tetrafluoroethylene copolymers are dissolved in the solvent to obtain a solution state; and removing the solvent.
Abstract:
A fluorinated resin composition includes a copolymer (A); and a copolymer (B). A mass ratio (A/B) of the copolymer (A) to the copolymer (B) is from 60/40 to 99/1, and a volume flow rate is from 0.5 to 100 mm3/sec. The copolymer (A) comprises: units derived from a monomer (a) which is tetrafluoroethylene; units derived from a monomer (b) which is at least one member selected from ethylene, hexafluoropropylene and a perfluoro(alkyl vinyl ether). The copolymer (A) has carbonyl groups. The copolymer (B) comprises: units derived from the monomer (a); units derived from the monomer (b); and units derived from the monomer (c) having two or more polymerizable carbon-carbon double bonds. A content of the units derived from the monomer (c) is from 0.1 to 2 mol % based on total units in the copolymer (B).
Abstract:
To provide a fluorinated elastomer composition which is excellent in heat discoloration resistance and moldability, and a molded product, cross-linked product and covered electric wire, using such a fluorinated elastomer composition.A fluorinated elastomer composition comprising a fluorinated rubber (a) and a fluorinated copolymer (b), wherein the fluorinated copolymer (b) has units (A) derived from tetrafluoroethylene and units (B) derived from ethylene in a molar ratio [(A)/(B)] of the units (A) to the units (B) of from 25/75 to 80/20; the fluorinated copolymer (b) has a crystallization temperature of from 100 to 210° C. and a melt flow rate of from 0.1 to 1,000 g/10 min.; and the mass ratio [(a)/(b)] of the fluorinated rubber (a) to the fluorinated copolymer (b) is from 80/20 to 20/80.
Abstract:
To provide a covering material for a heat resistant electric wire, which can cover a core wire without breakage from a weld line and which is excellent in the stress crack resistance at high temperature.A covering material for a heat resistant electric wire, which comprises a fluorinated copolymer composition containing a melt-moldable fluorinated copolymer (A) and a non-fluorinated thermoplastic resin (B1) in a volume ratio of (A)/(B1)=99/1 to 60/40, wherein the non-fluorinated thermoplastic resin (B1) is contained in the fluorinated copolymer composition in the form of fine particles having an average dispersed particle size of at most 8 μm, and the fluorinated copolymer composition has a storage elastic modulus of at least 90 MPa by dynamic viscoelasticity measurement at 200° C. Instead of the non-fluorinated thermoplastic resin (B1), a non-fluorinated resin (B2) having no melting point at 450° C. or below may be contained in the form of fine particles having an average dispersed particle size of at most 8 μm.