Profile extrusion method, article, and composition
View Patent ↗A glass fiber-filled poly(arylene ether)/polyamide composition exhibits reduced die build-up during profile extrusion. The composition includes specific amounts of polyamide, poly(arylene ether), glass fibers, and polypropylene. The reduced die build-up means that the profile extrusion equipment needs to be shut down and cleaned less often, resulting in a substantial productivity improvement.
1. A method of profile extrusion, comprising:
extruding through a die a thermoplastic composition having a temperature of about 275 to about 310° C.; and
cooling the extruded composition to form an extruded thermoplastic article;
wherein the thermoplastic composition comprises the product of melt blending
about 35 to about 55 weight percent of a polyamide,
about 30 to about 50 weight percent of a poly(arylene ether),
about 5 to about 15 weight percent of glass fibers,
about 0.5 to about 4 weight percent of a polypropylene, and
one or both of
about 0.5 to about 2 weight percent of low density polyethylene, and
about 0.02 to about 0.5 weight percent of a copolymer of vinylidene fluoride and hexafluoropropylene, the copolymer having a fluorine content of about 60 to about 70 weight percent based on the total weight of the copolymer;
wherein all weight percents are based on the total weight of the thermoplastic composition unless a different weight basis is specified.
2. The method of claim 1 , wherein the polypropylene is a homopolypropylene having a weight average molecular weight of at least 15,000 atomic mass units.
3. The method of claim 1 , wherein the polyamide comprises a polyamide-6,6.
4. The method of claim 1 , wherein the poly(arylene ether) comprises a poly(2,6-dimethyl-1,4-phenylene ether) having an intrinsic viscosity of about 0.35 to about 0.5 deciliter per gram measured at 25° C. in chloroform.
5. The method of claim 1 , wherein the thermoplastic composition comprises the low density polyethylene.
6. The method of claim 1 , wherein the thermoplastic composition comprises the copolymer of vinylidene fluoride and hexafluoropropylene.
7. The method of claim 1 , wherein the thermoplastic composition comprises the low density polyethylene and the copolymer of vinylidene fluoride and hexafluoropropylene.
8. The method of claim 1 , wherein the thermoplastic composition comprises less than or equal to 0.5 weight percent of an unhydrogenated or hydrogenated block copolymer of an alkenyl aromatic compound and a conjugated diene.
9. The method of claim 1 , wherein the thermoplastic composition comprises less than or equal to 5 weight percent of homopolystyrene.
10. The method of claim 1 , wherein the thermoplastic composition comprises less than or equal to 1 weight percent of impact modifiers.
11. The method of claim 1 , wherein the thermoplastic composition comprises less than or equal to 0.3 weight percent of electrically conductive agents.
12. The method of claim 1 , wherein the composition thermoplastic comprises a continuous phase comprising the polyamide and a disperse phase comprising the poly(arylene ether).
13. The method of claim 1 ,
wherein the thermoplastic composition is extruded through the die at a temperature of about 280 to about 300° C.;
wherein the thermoplastic composition comprises
about 40 to about 50 weight percent of the polyamide,
about 35 to about 45 weight percent of the poly(arylene ether),
about 7 to about 13 weight percent of the glass fibers,
about 1 to about 3 weight percent of the polypropylene,
about 0.5 to about 2 weight percent of the low density polyethylene, and
about 0.02 to about 0.5 weight percent of the copolymer of vinylidene fluoride and hexafluoropropylene;
wherein the polyamide comprises a polyamide-6,6;
wherein the poly(arylene ether) comprises a poly(2,6-dimethyl-1,4-phenylene ether) having an intrinsic viscosity of about 0.35 to about 0.46 deciliter per gram measured at 25° C. in chloroform; and
wherein the polypropylene is a homopolypropylene having a weight average molecular weight of about 20,000 to about 500,000 atomic mass units.
14. A profile-extruded article produced by the method of claim 1 .
15. A thermoplastic composition, comprising:
about 35 to about 55 weight percent of a polyamide,
about 30 to about 50 weight percent of a poly(arylene ether),
about 5 to about 15 weight percent of glass fibers,
about 0.5 to about 4 weight percent of a polypropylene, and
one or both of
about 0.5 to about 2 weight percent of low density polyethylene, and
about 0.02 to about 0.5 weight percent of a copolymer of vinylidene fluoride and hexafluoropropylene, the copolymer having a fluorine content of about 60 to about 70 weight percent based on the total weight of the copolymer;
wherein all weight percents are based on the total weight of the thermoplastic composition unless a different weight basis is specified.
16. The thermoplastic composition of claim 15 , wherein the polypropylene is a homopolypropylene having a weight average molecular weight of at least 15,000 atomic mass units.
17. The thermoplastic composition of claim 15 , wherein the polyamide comprises a polyamide-6,6.
18. The thermoplastic composition of claim 15 , wherein the poly(arylene ether) comprises a poly(2,6-dimethyl-1,4-phenylene ether) having an intrinsic viscosity of about 0.35 to about 0.5 deciliter per gram measured at 25° C. in chloroform.
19. The thermoplastic composition of claim 15 , comprising the low density polyethylene.
20. The thermoplastic composition of claim 15 , comprising the copolymer of vinylidene fluoride and hexafluoropropylene.
21. The thermoplastic composition of claim 15 , comprising the low density polyethylene and the copolymer of vinylidene fluoride and hexafluoropropylene.
22. The thermoplastic composition of claim 15 , comprising less than or equal to 0.5 weight percent of an unhydrogenated or hydrogenated block copolymer of an alkenyl aromatic compound and a conjugated diene.
23. The thermoplastic composition of claim 15 , comprising less than or equal to 5 weight percent of homopolystyrene.
24. The thermoplastic composition of claim 15 , comprising less than or equal to 1 weight percent of impact modifiers.
25. The thermoplastic composition of claim 15 , comprising less than or equal to 0.3 weight percent of electrically conductive agents.
26. The thermoplastic composition of claim 15 , comprising a continuous phase comprising the polyamide and a disperse phase comprising the poly(arylene ether).
27. The thermoplastic composition of claim 15 ,
wherein the thermoplastic composition comprises
about 40 to about 50 weight percent of the polyamide,
about 35 to about 45 weight percent of the poly(arylene ether),
about 7 to about 13 weight percent of the glass fibers, and
about 1 to about 3 weight percent of the polypropylene,
about 0.5 to about 2 weight percent of the low density polyethylene, and
about 0.02 to about 0.5 weight percent of the copolymer of vinylidene fluoride and hexafluoropropylene;
wherein the polyamide comprises a polyamide-6,6;
wherein the poly(arylene ether) comprises a poly(2,6-dimethyl-1,4-phenylene ether) having an intrinsic viscosity of about 0.35 to about 0.46 deciliter per gram measured at 25° C. in chloroform; and
wherein the polypropylene is a homopolypropylene having a weight average molecular weight of about 20,000 to about 500,000 atomic mass units.
28. A profile-extruded article comprising the composition of claim 15 .