Amorphous high performance polyamide
The disclosure relates to an improved method of producing MPMD based amorphous, semi-aromatic polyamides in order to improve their mechanical properties. It also relates to improved formulations of these polyamides which have further improved mechanical properties by the incorporation of greater amounts of isophthalic acid. The disclosure relates to an improved method of producing MPMD based amorphous, semi-aromatic polyamides in order to improve their mechanical properties. It also relates to improved formulations of these polyamides which have further improved mechanical properties by the incorporation of greater amounts of isophthalic acid.
1. A composition comprising from about 65 to about 95 wt. % of an aliphatic polyamide and a copolyamide containing about 40 to about 60 mol % 2-methyl-1,5-pentamethyleneterephthalamide (“MPMD-T”) units and about 40 to about 60 mol % 2-methyl-1,5-pentamethyleneisophthalamide (“MPMD-I”) units,
wherein the copolyamide has a relative viscosity (“RV”) of more than 1.90, and
wherein the copolyamide has a glass transition temperature of at least 145° C.
2. The composition of claim 1 , wherein the copolyamide contains about 50 to about 60 mol % MPMD-T units and about 40 to about 50 mol % MPMD-I units.
3. The composition of claim 1 , wherein the tensile strength of the copolyamide is more than 80 MPa.
4. The composition of claim 1 , wherein the notched Izod impact strength of the copolyamide is more than 5 kJ/m 2 .
5. The composition of claim 1 , wherein the unnotched Izod impact strength of the copolyamide is more than 30 kJ/m 2 .
6. The composition of claim 1 , wherein the copolyamide has a tensile modulus of more than 3.0.
7. The composition of claim 1 , wherein the copolyamide has a flexural modulus of more than 3.0.
8. The composition of claim 1 , wherein the copolyamide has a flexural strength of more than 130.
9. The composition of claim 1 , wherein, in the presence of a solvent, the copolyamide is preserved.
10. The composition of claim 9 , wherein the solvent is a polar solvent.
11. The composition of claim 9 , wherein the solvent is an alcohol.
12. The composition of claim 11 , wherein the solvent is methanol, ethanol, propanol, butanol, pentanol or hexanol.
13. The composition of claim 9 , wherein the copolyamide is preserved in the presence of a solvent for at least 5 hours.
14. A composition comprising polymeric resins in a ratio of from about 65 to about 95 wt. % of an aliphatic polyamide and from about 5 to about 40 wt. % of a copolyamide containing about 40 to about 60 mol % 2-methyl-1,5-pentamethyleneterephthalamide (“MPMD-T”) units and about 40 to about 60 mol % 2-methyl-1,5-pentamethylene-isophthalamide (“MPMD-I”) units,
wherein the copolyamide has a relative viscosity (“RV”) of more than 1.90, and
wherein the copolyamide has a glass transition temperature of at least 145° C.
15. The composition of claim 14 , wherein the copolyamide is present from about 10 to about 35 wt. %.
16. The composition of claim 14 , wherein the copolyamide is present at from about 15 to about 30 wt. %.
17. The composition of claim 14 , wherein the aliphatic polyamide is selected from the group consisting of polyhexamethlyeneadipamide (N66), polycaproamide (N6), polyenanthamide (nylon 7), polylaurolactamide (nylon 12), polyundecaneamide (nylon 11), polyhexamethylenedodecamide (nylon 612), and combinations thereof.
18. The composition of claim 1 , further comprising a reinforcing material selected from glass fiber, inorganic filler or a rubber component.
19. The composition of claim 14 , further comprising a reinforcing material selected from glass fiber, inorganic filler or a rubber component.
20. The composition of claim 18 , wherein the reinforcing material is glass fiber.
21. The composition of claim 19 , wherein the reinforcing material is glass fiber.
22. The composition of claim 1 , wherein the composition as-molded is transparent.
23. The composition of claim 14 , wherein the composition as-molded is transparent.
24. The composition of claim 14 , wherein, in the presence of a solvent, the copolyamide is preserved.