Compositions of polypropylene and polyamide
The invention relates to thermoplastic compositions in which (A) an isotactic polypropylene, optionally containing comonomer, with a melting point of at least 110° C. and (B) a polyamide, (A) and (B) constituting at least 70 wt %, are blended with (C) at least 2 wt % of a grafted functionalized propylene-based elastomer having isotactic crystallinity and containing at least 0.25 wt % of MAH-derived units based on the total weight of (C). Optionally (D) an ungrafted polyolefin may be added with a melting point of less than 100° C., (C) and (D) combined being at least 8 wt % and the wt % of (A), (B), (C) and (D) being calculated on the basis of the total polymer weight of the thermoplastic composition.
1. A thermoplastic composition comprising:
(A) an isotactic polypropylene having a melting point of at least 110° C.;
(B) a polyamide;
(C) at least 2% by weight, based on the total polymer weight of the thermoplastic composition, of a grafted functionalized propylene-based elastomer having isotactic crystallinity, a heat of fusion of less than 40 J/g, and a melting point of less than 110° C.; and containing at least 0.25% by weight, based on the total weight of the propylene-based elastomer, of maleic anhydride-derived units; and optionally
(D) an ungrafted polyolefin having a melting point of less than 100 ° C.;
wherein the combined wt % of (A) and (B) is at least 70%, based on the total polymer weight of the thermoplastic composition, and the combined wt % of (C) and (D) is at least 8% based on the total polymer weight of the thermoplastic composition.
2. The thermoplastic composition of claim 1 , wherein the thermoplastic composition comprises at least 4% by weight of the propylene-based elastomer(C), based on the total polymer weight of the thermoplastic composition; and wherein the combined wt % of (C) and (D) is less than 30%, based on the total polymer weight of the thermoplastic composition.
3. The thermoplastic composition of claim 1 , wherein the propylene-based elastomer (C) has crystallinity derived from stereoregularly arranged propylene units.
4. The thermoplastic composition of claim 3 , wherein the propylene-based elastomer (C) has crystallinity derived from isotactically arranged propylene units.
5. The thermoplastic composition of claim 1 , wherein the propylene-based elastomer (C) contains from 0.1% to 2% by weight, based on the total weight of the propylene-based elastomer, of maleic anhydride-derived units.
6. The thermoplastic composition of claim 1 , wherein the propylene-based elastomer (C) contains from 0.5% to 1.5% by weight, based on the total weight of the propylene-based elastomer, of maleic anhydride-derived units.
7. The thermoplastic composition of claim 1 , wherein the propylene-based elastomer (C) contains from 5 to 40 mol % of ethylene-derived units and has a heat of fusion of from 5 to 30 J/g.
8. The thermoplastic composition of claim 1 , wherein the propylene-based elastomer (C) contains from 12.5 to 25 mol % ethylene-derived units.
9. The thermoplastic composition of claim 1 , wherein the ungrafted polyolefin (D) is an ethylene alpha-olefin copolymer having a density of from 0.85 to 0.89 g/cc.
10. The thermoplastic composition of claim 9 , wherein the ethylene alpha-olefin copolymer contains from 45 to 65 wt % ethylene-derived units.
11. The thermoplastic composition of claim 1 , wherein the ungrafted polyolefin (D) is an ethylene propylene copolymer containing from 45 to 65 wt % ethylene-derived units, based on the total weight of the copolymer.
12. The thermoplastic composition of claim 11 , wherein the ungrafted polyolefin (D) is used in an amount of from 60% to 20% by weight, based on the total combined weight of(C) and (D).
13. The thermoplastic composition of claim 1 , wherein the ungrafted polyolefin (D) is a propylene-based elastomer having isotactic crystallinity and containing a comonomer in an amount within 10 mol % of the amount of comonomer present in (C).
14. The thermoplastic composition of claim 13 , wherein the comonomer of the ungrafted polyolefin (D) is ethylene and the comonomer of(C) is ethylene.
15. The thermoplastic composition of claim 1 , wherein the isotactic polypropylene (A) is selected from the group consisting of a polypropylene homopolymer, and a polypropylene random copolymer containing less than 10 wt % of crystallinity-disrupting comonomer.
16. The thermoplastic composition of claim 1 , wherein the polyamide (B) is selected from the group consisting of nylon 6, nylon 12, and nylon 6,6.
17. The thermoplastic composition of claim 15 , wherein the polyamide (B) is selected from the group consisting of nylon 6, nylon 12, and nylon 6,6.
18. A molded article made from the thermoplastic composition of claim 1 .
19. An extruded article made from the thermoplastic composition of claim 1 .
20. A thermoplastic composition comprising:
(A) at least 60% by weight, based on the total polymer weight of the thermoplastic composition, of an isotactic polypropylene having a melting point of at least 100° C.;
(B) at least 10 by weight, based on the total polymer weight of the thermoplastic composition, of a polyamide;
(C) at least 2% by weight, based on the total polymer weight of the thermoplastic composition, of a grafted functionalized propylene-based elastomer having isotactic crystallinity and containing at least 0.25% by weight, based on the total weight of the propylene-based elastomer, of maleic anhydride-derived units; and optionally
(D) an ungrafted polyolefin having a melting point of less than 100° C.;
wherein the combined wt % of (C) and (D) is at least 8% by weight, based on the total polymer weight of the thermoplastic composition; the thermoplastic composition has a matrix formed by the isotactic polypropylene (A); and the thermoplastic composition has a Flexural modulus of from 800 to 1600 MPa.
21. The thermoplastic composition of claim 20 , wherein the thermoplastic composition has a Flexural modulus of from 900 to 1200 MPa.
22. The thermoplastic composition of claim 20 , wherein the thermoplastic composition comprises at least 4% by weight, based on the total polymer weight of the thermoplastic composition, of the grafted functionalized propylene-based elastomer (C), and wherein the combined wt % of (C) and (D) is less than 30%.
23. The thermoplastic composition of claim 20 , wherein the thermoplastic composition has a ratio
[Izod Impact J/m 2 ]/[Flexural Modulus in MPa] conforming to the relationship:
12<[Izod Impact J/m 2 ]) /[Flexural Modulus in MPa]×1000<50.
24. The thermoplastic composition of claim 20 , wherein the thermoplastic composition has a ratio
[Izod Impact J/m 2 ]/[Flexural Modulus in MPa] conforming to the relationship:
15<[Izod Impact J/m 2 ]/ [Flexural Modulus in MPa]×1000<45.
25. The thermoplastic composition of claim 20 , wherein the propylene-based elastomer (C) has crystallinity derived from stereoregularly arranged propylene units, a heat of fusion of less than 40 J/g, and a melting point of less than 110° C.
26. The thermoplastic composition of claim 25 , wherein the propylene-based elastomer (C) has crystallinity derived from isotactically arranged propylene units.
27. The thermoplastic composition of claim 20 , wherein the propylene-based elastomer (C) contains from 0.1% to 2% by weight, based on the total weight of the propylene-based elastomer, of maleic anhydride-derived units.
28. The thermoplastic composition of claim 20 , wherein the propylene-based elastomer (C) contains from 0.5% to 1.5% by weight, based on the total weight of the propylene-based elastomer, of maleic anhydride-derived units.
29. The thermoplastic composition of claim 20 , wherein the propylene-based elastomer (C) contains from 5 to 40 mol % of ethylene-derived units and has a heat of fusion of from 5 to 30 J/g.
30. The thermoplastic composition of claim 20 , wherein the propylene-based elastomer (C) contains from 12.5 to 25 mol % of ethylene-derived units.
31. The thermoplastic composition of claim 20 , wherein the ungrafted polyolefin (D) is an ethylene alpha-olefin copolymer having a density of from 0.85 to 0.89 g/cc.
32. The thermoplastic composition of claim 31 , wherein the ethylene alpha-olefin copolymer contains from 45 to 65 wt % ethylene-derived units.
33. The thermoplastic composition of claim 20 , wherein the ungrafted polyolefin (D) is an ethylene propylene copolymer containing from 45 to 65 wt % ethylene-derived units.
34. The thermoplastic composition of claim 33 , wherein the ungrafted polyolefin (D) is used in an amount of from 60% to 20% by weight, based on the total combined weight of(C) and (D).
35. The thermoplastic composition of claim 20 , wherein the ungrafted polyolefin (D) is a propylene-based elastomer having isotactic crystallinity and containing a comonomer in an amount within 10 mol % of the amount of comonomer present in (C).
36. The thermoplastic composition of claim 35 , wherein the comonomer of the ungrafted polyolefin (D) is ethylene and the comonomer of (C) is ethylene.
37. The thermoplastic composition of claim 20 , wherein the isotactic polypropylene (A) is selected from the group consisting of a polypropylene homopolymer, and a polypropylene random copolymer containing less than 10 wt % of crystallinity-disrupting comonomer.
38. The thermoplastic composition of claim 20 , wherein the polyamide (B) is selected from the group consisting of nylon 6, nylon 12, and nylon 6,6.
39. The thermoplastic composition of claim 37 , wherein the polyamide (B) is selected from the group consisting of nylon 6, nylon 12, and nylon 6,6.
40. A molded article made from the thermoplastic composition of claim 20 .
41. An extruded article made from the thermoplastic composition of claim 20 .
42. A thermoplastic composition comprising;
(A) at least 10% by weight, based on the total polymer weight of the thermoplastic composition, of an isotactic polypropylene having a melting point of at least 110° C.;
(B) at least 60% by weight, based on the total polymer weight of the thermoplastic composition, of a polyamide;
(C) at least 2% by weight, based on the total polymer weight of the thermoplastic composition, of a grafted functionalized propylene-based elastomer having isotactic crystallinity and containing at least 0.25% by weight, based on the total weight of the propylene-based elastomer, of maleic anhydride-derived units; and optionally
(D) an ungrafted polyolefin having a melting point of less than 100° C.;
wherein the combined wt % of (C) and (D) is at least 8% by weight, based on the total polymer weight of the thermoplastic composition; the thermoplastic composition has a matrix formed by the polyamide (B); and the thermoplastic composition has a Flexural modulus of from 1200 to 2000 MPa.
43. The thermoplastic composition of claim 42 , wherein the thermoplastic composition has a Flexural modulus of from 1400 to 1800 MPa.
44. The thermoplastic composition of claim 42 , wherein the thermoplastic composition comprises at least 4% by weight, based on the total polymer weight of the thermoplastic composition, of the grafted functionalized propylene-based elastomer (C), and wherein the combined wt % of (C) and (D) is less than 30%.
45. The thermoplastic composition of claim 42 , wherein the thermoplastic composition has a ratio
[Izod Impact J/m 2 ]/[Flexural Modulus in MPa] conforming to the relationship:
14<[Izod Impact J/m 2 ]/[Flexural Modulus in MPa]×1000<80.
46. The thermoplastic composition of claim 42 , wherein the thermoplastic composition has a ratio
[Izod Impact J/m 2 ]/[Flexural Modulus in MPa] conforming to the relationship:
18<[Izod Impact J/m 2 ]/[Flexural Modulus in MPa]×1000<60.
47. The thermoplastic composition of claim 42 , wherein the propylene-based elastomer (C) has crystallinity derived from stereoregularly arranged propylene units, a heat of fusion of less than 40 J/g, and a melting point of less than 110° C.
48. The thermoplastic corn position of claim 47 , wherein the propylene-based elastomer (C) has crystallinity derived from isotactically arranged propylene units.
49. The thermoplastic composition of claim 42 , wherein the propylene-based elastomer (C) contains from 0.1% to 2% by weight, based on the total weight of the propylene-based elastomer, of maleic anhydride-derived units.
50. The thermoplastic composition of claim 42 , wherein the propylene-based elastomer (C) contains from 0.1% to 1.5% by weight, based on the total weight of the propylene-based elastomer, of maleic anhydride-derived units.
51. The thermoplastic composition of claim 42 , wherein the propylene-based elastomer (C) contains from 0.5% to 1.5% by weight, based on the total weight of the propylene-based elastomer, of maleic anhydride-derived units.
52. The thermoplastic composition of claim 42 , wherein the propylene-based elastomer (C) contains from 5 to 40 mol % of ethylene-derived units and has a heat of fusion of from 5 to 30 J/g.
53. The thermoplastic composition of claim 42 , wherein the propylene-based elastomer (C) contains from 12.5 to 25 mol % of ethylene-derived units.
54. The thermoplastic composition of claim 42 , wherein the ungrafted polyolefin (D) is an ethylene alpha-olefin copolymer having a density of from 0.85 to 0.89 g/cc.
55. The thermoplastic composition of claim 54 , wherein the ethylene alpha-olefin copolymer contains from 45 to 65 wt % ethylene-derived units.
56. The thermoplastic composition of claim 42 , wherein the ungrafted polyolefin (D) is an ethylene propylene copolymer containing from 45 to 65 wt % ethylene-derived units.
57. The thermoplastic composition of claim 56 , wherein the ungrafted polyolefin (D) is used in an amount of from 60% to 20% by weight, based on the total combined weight of(C) and (D).
58. The thermoplastic composition of claim 42 , wherein the ungrafted polyolefin (D) is a propylene-based elastomer having isotactic crystallinity and containing a comonomer in an amount within 10 mol % of the amount of comonomer present in (C).
59. The thermoplastic composition of claim 58 , wherein the comonomer of the ungrafted polyolefin (D) is ethylene and the comonomer of (C) is ethylene.
60. The thermoplastic composition of claim 42 , wherein the isotactic polypropylene (A) is selected from the group consisting of a polypropylene homopolymer, and a polypropylene random copolymer containing less than 10 wt % of crystallinity-disrupting comonomer.
61. The thermoplastic composition of claim 42 , wherein the polyamide (B) is selected from the group consisting of nylon 6, nylon 12, and nylon 6,6.
62. The thermoplastic composition of claim 60 , wherein the polyamide (B) is selected from the group consisting of nylon 6, nylon 12, and nylon 6,6.
63. A molded article made from the thermoplastic composition of claim 42 .
64. An extruded article made from the thermoplastic composition of claim 42 .