Flame retardant poly(hexano-6-lactam)
View Patent ↗Poly(hexano-6-lactam) (also known as Nylon 6) compounds that are flame retardant using non-halogenated ingredients are disclosed. Polyphenylene ether acts as a synergist when used in specific amounts in combination with polyphosphonate to achieve a V-0 rating in a UL 94 test at thicknesses of about 3.18 mm.
1. A flame retardant nylon compound consisting of:
(a) poly(hexano-6-lactam);
(b) polyphosphonate homopolymer in an amount ranging from about 35 to about 40 weight percent, by weight of the compound;
(c) polyphenylene ether in an amount ranging from about 20 to about 25 weight percent, by weight of the compound;
(d) maleic anhydride compatibilizer;
(e) polytetrafluoroethylene; and
(f) stabilizer, wherein the stabilizer is a blend of trisarylphosphite and sterically hindered phenolic antioxidant;
wherein the compound, when injection molded at a thickness of about 3.18 mm, has a UL 94 rating of V-0.
2. The flame retardant nylon compound of claim 1 , wherein the polyphosphonate homopolymer has a phosphorus content of greater than about 8 weight percent, a glass transition temperature of at least about 100° C., and a limiting oxygen index of about 50% or higher.
3. A plastic article shaped from the flame retardant nylon compound of claim 1 .
4. A flame retardant nylon compound consisting of:
(a) poly(hexano-6-lactam) in an amount ranging from about 34.1 to about 44.1 weight percent, by weight of the compound;
(b) polyphosphonate homopolymer in an amount ranging from about 35 to about 40 weight percent, by weight of the compound;
(c) polyphenylene ether in an amount ranging from about 20 to about 25 weight percent, by weight of the compound;
(d) maleic anhydride compatibilizer in an amount of about 0.3 weight percent, by weight of the compound;
(e) polytetrafluoroethylene in an amount of about 0.5 weight percent, by weight of the compound; and
(f) stabilizer in an amount of about 0.1 weight percent, by weight of the compound, wherein the stabilizer is a blend of trisarylphosphite and sterically hindered phenolic antioxidant;
wherein the compound, when injection molded at a thickness of about 3.18 mm, has a UL 94 rating of V-0.
5. The flame retardant nylon compound of claim 4 , wherein the polyphosphonate homopolymer has a phosphorus content of greater than about 8 weight percent, a glass transition temperature of at least about 100° C., and a limiting oxygen index of about 50% or higher.
6. A plastic article shaped from the flame retardant nylon compound of claim 4 .
7. A flame retardant nylon compound consisting of:
(a) poly(hexano-6-lactam);
(b) polyphosphonate homopolymer in an amount ranging from about 35 to about 40 weight percent, by weight of the compound;
(c) polyphenylene ether in an amount ranging from about 20 to about 25 weight percent, by weight of the compound;
(d) maleic anhydride compatibilizer;
(e) polytetrafluoroethylene;
(f) stabilizer, wherein the stabilizer is a blend of trisarylphosphite and sterically hindered phenolic antioxidant; and
(g) optionally pigment, colorant, or dye;
wherein the compound, when injection molded at a thickness of about 3.18 mm, has a UL 94 rating of V-0.
8. The flame retardant nylon compound of claim 7 , wherein the polyphosphonate homopolymer has a phosphorus content of greater than about 8 weight percent, a glass transition temperature of at least about 100° C., and a limiting oxygen index of about 50% or higher.
9. A plastic article shaped from the flame retardant nylon compound of claim 7 .