Fluorinated elastomer composition and method for its production, molded product, cross-linked product, and covered electric wire
View Patent ↗To provide a fluorinated elastomer composition which is excellent in flexibility, heat resistance and flame retardance, and a molded product, cross-linked product and covered electric wire, using such a fluorinated elastomer composition. A fluorinated elastomer composition comprising a tetrafluoroethylene/propylene copolymer (a), an ethylene/tetrafluoroethylene copolymer (b), an ethylene copolymer (c) containing epoxy groups and a flame retardant (d), wherein the mass ratio [(a)/(b)] of (a) to (b) is from 70/30 to 40/60, the mass ratio [(b)/(c)] of (b) to (c) is from 100/0.1 to 100/10, and the content of (d) is from 0.1 to 30 parts by mass per 100 parts by mass of the total content of (a), (b) and (c).
1. A fluorinated elastomer composition comprising a tetrafluoroethylene/propylene copolymer (a), an ethylene/tetrafluoroethylene copolymer (b), an ethylene copolymer (c) containing epoxy groups and a flame retardant (d), wherein
the mass ratio [(a)/(b)] of the tetrafluoroethylene/propylene copolymer (a) to the ethylene/tetrafluoroethylene copolymer (b) is from 70/30 to 40/60,
the mass ratio [(b)/(c)] of the ethylene/tetrafluoroethylene copolymer (b) to the ethylene copolymer (c) containing epoxy groups is from 100/0.1 to 100/10, and
the content of the flame retardant (d) is from 0.1 to 30 parts by mass per 100 parts by mass of the total content of the tetrafluoroethylene/propylene copolymer (a), the ethylene/tetrafluoroethylene copolymer (b) and the ethylene copolymer (c) containing epoxy groups.
2. The fluorinated elastomer composition according to claim 1 , wherein the flame retardant (d) is at least one member selected from the group consisting of antimony trioxide, a phosphoric acid ester and polytetrafluoroethylene.
3. The fluorinated elastomer composition according to claim 1 , wherein the tetrafluoroethylene/propylene copolymer (a) is a copolymer comprising from 35 to 70 mol % of units derived from tetrafluoroethylene, from 25 to 55 mol % of units derived from propylene, and from 0 to 40 mol % of units derived from other monomer, and
the ethylene/tetrafluoroethylene copolymer (b) is a copolymer comprising from 45 to 70 mol % of units derived from tetrafluoroethylene, from 30 to 55 mol % of units derived from ethylene, and from 0 to 10 mol % of units derived from other monomer.
4. The fluorinated elastomer composition according to claim 1 , wherein the ethylene copolymer (c) containing epoxy groups is at least one member selected from the group consisting of an ethylene/glycidyl methacrylate copolymer, an ethylene/glycidyl methacrylate/vinyl acetate copolymer, an ethylene/methyl acrylate/glycidyl methacrylate copolymer and an ethylene/ethyl acrylate/glycidyl methacrylate copolymer.
5. The fluorinated elastomer composition according to claim 1 , which has a melt flow rate of from 4 to 50 g/10 min. as measured at a temperature of 297° C. under a load of 49N.
6. A method for producing the fluorinated elastomer composition as defined in claim 1 , which comprises a step of kneading the tetrafluoroethylene/propylene copolymer (a), the ethylene/tetrafluoroethylene copolymer (b), the ethylene copolymer (c) containing epoxy groups and the flame retardant (d) under a heating condition of from 250 to 320° C.
7. A molded product obtained by molding the fluorinated elastomer composition as defined in claim 1 .
8. A cross-linked product obtained by cross-linking the fluorinated elastomer composition as defined in claim 1 .
9. A covered electric wire comprising a conductor and a covering material for covering the conductor, wherein the covering material is the fluorinated elastomer composition as defined in claim 1 .
10. A covered electric wire comprising a conductor and a covering material for covering the conductor, wherein the covering material is the cross-linked product as defined in claim 8 .