Polymer blend composition for electronic communication devices
Compositions formed from a blend of polyetherimide, siloxane/bisphenol-A polyester/polycarbonate copolymer, polycyclohexylenedimethylene terephthalate, polycarbonate/siloxane copolymer, and styrene-ethylene-butadiene-styrene are disclosed that provide superior performance in terms of notched Izod impact, glass transition temperature (Tg), strength after aging, ability to withstand secondary processing conditions, and in other respects. Such compositions exceed critical-to-quality requirements for use in manufacturing components for electronic communication devices.
1. A polymer blend composition comprising:
(a) 15-25% by weight polyetherimide (PEI);
(b) 5-20% siloxane/bisphenol-A polyester/polycarbonate copolymer;
(c) 5-35% by weight polycyclohexylenedimethylene terephthalate (PCT);
(d) 15-45% by weight polycarbonate/siloxane copolymer; and
(e) 1-7% by weight styrene-ethylene-butadiene-styrene (SEBS);
wherein % by weight is calculated on the basis of the total weight of (a), (b), (c), (d), and (e), wherein a combined weight percent value of all components does not exceed 100 wt %, and
wherein the composition displays a Tg higher than 110° C. as tested with a Dynamic Mechanical Analyzer.
2. The composition according to claim 1 comprising 18-22% by weight PEI.
3. The composition according to claim 1 comprising about 20% by weight PEI.
4. The composition according to claim 1 comprising 7-15% by weight siloxane/bisphenol-A polyester/polycarbonate copolymer.
5. The composition according to claim 1 comprising about 11% by weight siloxane/bisphenol-A polyester/polycarbonate copolymer.
6. The composition according to claim 1 comprising 10-30% by weight PCT.
7. The composition according to claim 1 comprising about 25% by weight PCT.
8. The composition according to claim 1 comprising 15-35% by weight polycarbonate/siloxane copolymer.
9. The composition according to claim 1 comprising about 25% by weight polycarbonate/siloxane copolymer.
10. The composition according to claim 1 comprising about 3% by weight SEBS.
11. The composition according to claim 1 , further comprising an acrylic impact modifier.
12. The composition according to claim 1 , further comprising an antioxidant, antistatic agent, chain extender, de-molding agent, flow modifier, light stabilizer, lubricant, mold release agent, pigment, quenching agent, heat stabilizer, ultraviolet light absorber, ultraviolet reflectant substance, ultraviolet stabilizer, or any combination thereof.
13. The composition according to claim 1 , wherein said composition possesses an improvement in high temperature environmental stress crack resistance relative to an otherwise identical composition that comprises, in place of the PCT, a component that is formed from a lower % mol cyclohexylene dimethanol than PCT having 100% mol cyclohexylene dimethanol.
14. The composition according to claim 1 , wherein the composition has a notched Izod impact at 23° C. that is greater than 534 J/m as tested in accordance with ASTM D256.
15. The composition according to claim 1 , wherein the composition has a ductility of at least 60% as tested in accordance with ASTM D256.
16. An article comprising the composition according to claim 1 .
17. The article according to claim 16 , wherein said article is an antenna device, or an antenna coating, cover, or sheath.
18. A method for making a polymer blend composition comprising:
combining 15-25% by weight polyetherimide (PEI), 5-20% siloxane/bisphenol-A polyester/polycarbonate copolymer, 5-35% by weight polycyclohexylenedimethylene terephthalate (PCT), 15-45% by weight polycarbonate/siloxane copolymer, and 1-7% by weight styrene-ethylene-butadiene-styrene (SEBS); and,
extruding said combination to form said composition,
wherein % by weight is calculated on the basis of the total weight of all components,
wherein a combined weight percent value of all components does not exceed 100 wt %, and
wherein the composition displays a Tg higher than 110° C. as tested with a Dynamic Mechanical Analyzer.
19. The method according to claim 18 comprising combining 18-22% by weight of said PEI, 7-15% by weight of said siloxane/bisphenol-A polyester/polycarbonate copolymer, 10-30% by weight of said PCT, 15-35% by weight of said polycarbonate/siloxane copolymer, and about 3% by weight of said SEBS.
20. The method according to claim 18 comprising combining about 20% by weight of said PEI, about 11% by weight of said siloxane/bisphenol-A polyester/polycarbonate copolymer, about 25% by weight of said PCT, about 25% by weight of said polycarbonate/siloxane copolymer, and about 3% by weight of said SEBS.
21. The method according to claim 20 , further comprising combining an acrylic impact modifier with said PEI, said siloxane/bisphenol-A polyester/polycarbonate copolymer, said PCT, said polycarbonate/siloxane copolymer, and said SEBS.
22. An article comprising a polymer blend composition that is produced according to the method of claim 18 .