Ethylene-propylene copolymers with amorphous and semi-crystalline components
This invention relates to a polyolefin composition with (a) 80 to 90 wt % of an amorphous ethylene-propylene copolymer having either no crystallinity or crystallinity derived from ethylene, having about 30 wt % or more units derived from ethylene; (b) 5 to 15 wt % of a semi-crystalline ethylene-propylene copolymer having substantial crystallinity derived from ethylene and having 70 wt % or more units derived from ethylene; and (c) 1 to 5 wt % of a propylene-based elastomer having within the range from 5 to 25 wt % ethylene derived units and having a melting point temperature of less than 110° C. and a Mw/Mn within the range from 2.0 to 4.0.
1. A polyolefin composition comprising:
a. about 75 wt % to about 90 wt % based on the total weight of the composition of an amorphous ethylene-propylene copolymer having either no crystallinity or crystallinity derived from ethylene, having about 30 wt % or more units derived from ethylene;
b. about 5 wt % to about 25 wt % based on the total weight of the composition of a semi-crystalline ethylene-propylene copolymer having substantial crystallinity derived from ethylene and having about 70 wt % or more units derived from ethylene; and
c. about 1 wt % to about 5 wt % based on the total weight of the composition of a propylene-based elastomer having within the range from 5 to 25 wt % ethylene derived units and having a melting point temperature of less than 110° C. and a Mw/Mn within the range from 2.0 to 4.0.
2. The composition of claim 1 , wherein composition is a reactor blend of the amorphous ethylene-propylene copolymer, the semi-crystalline ethylene-propylene copolymer, and the propylene-based elastomer.
3. The composition of claim 1 , wherein the composition is a physical blend of the amorphous ethylene-propylene copolymer, the semi-crystalline ethylene-propylene copolymer, and the propylene-based elastomer.
4. The composition of claim 1 , wherein the composition has greater about 70 wt % to about 80 wt % units derived from ethylene.
5. The composition of claim 1 , wherein the composition is substantially free of diene units.
6. The composition of claim 1 , wherein the propylene-based elastomer has a melting point temperature within the range of from 80° C. to 110° C.
7. The composition of claim 1 , wherein the composition has a total ethylene content within the range of 6 to 25 wt %.
8. The composition of claim 1 , wherein the amorphous ethylene-propylene copolymer has a melt flow rate of about 0.01 g/10 min to about 1 g/10 min.
9. The composition of claim 1 , wherein the semi-crystalline ethylene-propylene copolymer has a melt flow rate of about 0.1 g/10 min to about 15 g/10 min.
10. The composition of claim 1 , wherein the amorphous ethylene-propylene copolymer has about 35 wt % to about 55 wt % of units derived from ethylene.
11. The composition of claim 1 , wherein the semi-crystalline ethylene-propylene copolymer has about 70 wt % to about 80 wt % of units derived from ethylene.
12. An automotive component made from the composition of claim 1 .
13. A polyolefin composition comprising:
a. about 80 wt % to about 90 wt % based on the total weight of the composition of an amorphous ethylene-propylene copolymer having either no crystallinity or crystallinity derived from ethylene, having from about 35 wt % to about 55 wt % units derived from ethylene;
b. about 5 wt % to about 15 wt % based on the total weight of the composition of a semi-crystalline ethylene-propylene copolymer having substantial having substantial crystallinity derived from ethylene, having from about 70 wt % to about 80 wt % units derived from ethylene; and
c. about 1.5 wt % to about 3.5 wt % based on the total weight of the composition of a propylene-based elastomer having within the range from 6 to 20 wt % ethylene derived units and having a melting point temperature of less than 110° C., a melt flow rate of about 0.1 g/10 min to about 3 g/10 min, and a Mw/Mn within the range from 2.0 to 4.0.
14. The composition of claim 13 , wherein the amorphous ethylene-propylene copolymer has a melt flow rate of about 0.01 g/10 min to about 1 g/10 min.
15. The composition of claim 13 , wherein the semi-crystalline ethylene-propylene copolymer has a melt flow rate of about 0.1 g/10 min to about 15 g/10 min.
16. An automotive component made from the composition of claim 13 .