Thermoplastic polyimide as flow promoter and flame retardant synergist for filled polyamide compositions
View Patent ↗Disclosed herein are compositions comprising polyamides, thermoplastic polyimides, and inorganic fillers. The compositions can also comprise a flame retardant additive. Also disclosed are materials and devices made thereof. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.
1. A composition comprising:
(a) about 30% to about 80% by weight polyamide;
(b) about 2% to about 15% by weight thermoplastic polyimide; and
(c) about 30% to about 50% by weight inorganic filler,
wherein the composition has a melt viscosity that is at least 10% lower as compared to a substantially identical composition but without the thermoplastic polyimide as determined by test method ISO 11443 at the same temperature and at the same shear rate.
2. The composition of claim 1 , further comprising above 0% to about 20% by weight of at least one flame retardant additive.
3. The composition of claim 1 , wherein the thermoplastic polyimide is a polyetherimide.
4. The composition of claim 1 , wherein the thermoplastic polyimide is present in an amount of about 2% to about 10% by weight of the composition.
5. The composition of claim 1 , wherein the polyamide is present in an amount of about 40% to about 60% by weight of the composition.
6. The composition of claim 2 , wherein the flame retardant additive is present in an amount of about 10% to about 16% by weight of the composition.
7. The composition of claim 2 , wherein the flame retardant additive is selected from the group consisting of halogen-free phosphinate, halogen-free disphosphinate, reaction product of melamine with phosphoric acid, phosphazene compounds, and mixtures thereof.
8. The composition of claim 2 , wherein the flame retardant additive comprises aluminum phosphinate and melamine polyphosphate.
9. The composition of claim 3 , wherein the polyetherimide is selected from the group consisting of polyetherimide homopolymer, copolymer, and mixtures thereof.
10. The composition of claim 1 , wherein the inorganic filler is selected from the group consisting of glass fiber, carbon fiber, glass flake, ceramic fiber, and mixtures thereof.
11. The composition of claim 1 , wherein the inorganic filler is selected from the group consisting of glass fiber, carbon fiber, and mixtures thereof.
12. The composition of claim 1 , wherein the polyamide is polyphthalamide.
13. The composition of claim 1 , wherein the polyamide is selected from the group consisting of PA9T, PA6T, PA6I, PA6-6T, PA6-6IT, PA6M-T, and mixtures thereof.
14. A device comprising the composition of claim 1 .
15. The device of claim 14 , wherein the device is a computer.
16. The composition of claim 1 , wherein the composition has a melt viscosity that is at least 20% lower as compared to a substantially identical composition but without the thermoplastic polyimide as determined by test method ISO 11443 at a the same temperature and at the same shear rate.
17. The composition of claim 2 , wherein the composition has a flammability rating of V0 as determined by test method UL 94.
18. A new composition comprising:
(d) about 30% to about 80% by weight polyamide;
(e) about 2% to about 15% by weight thermoplastic polyimide; and
(f) about 30% to about 50% by weight inorganic filler,
wherein the composition has a notched IZOD impact strength that is at least 100% of the notched IZOD impact strength of a substantially identical composition but without the thermoplastic polyimide as determined by test method ASTM D256.
19. A composition comprising:
(g) about 30% to about 80% by weight polyamide;
(h) about 2% to about 15% by weight thermoplastic polyimide; and
(i) about 30% to about 50% by weight inorganic filler,
wherein the composition has a notched IZOD impact strength that is at least 90% of the notched IZOD impact strength of a substantially identical composition but without the thermoplastic polyimide as determined by test method ASTM D256 and wherein the composition has a melt viscosity that is at least 10% lower as compared to a substantially identical composition but without the thermoplastic polyimide as determined by test method ISO 11443 at same temperature and at the same shear rate.