Paintable, in-reactor blended, thermoplastic polyolefin
View Patent ↗A paintable impact copolymer composition is produced by in-reactor blending of a xylene insoluble polypropylene fraction and a xylene soluble ethylene-propylene rubber (EPR) fraction. The composition comprises from about 5 wt. % to about 50 wt. % a xylene-soluble portion and from about 50 wt. % to about 95 wt. % a xylene-insoluble portion. The ratio of the weight average molecular weight of said xylene-soluble portion to that of said xylene-insoluble portion is from about 0.5 to about 1.8. The intrinsic viscosity of said xylene-soluble portion is from about 0.5 to about 7.0 dL/g. The xylene-soluble portion comprises from about 30 to about 70 mole percent ethylene units.
1. A paintable impact copolymer composition comprising:
a continuous phase comprising a propylene homopolymer and a discontinuous phase comprising an ethylene-propylene rubber;
said impact copolymer composition having from about 5 wt. % to about 50 wt. % of a xylene-soluble portion and from about 50 wt. % to about 95 wt. % of a xylene-insoluble portion; wherein
the ratio of the weight average molecular weight of said xylene-soluble portion to that of said xylene-insoluble portion is from about 0.5 to about 1.8;
the intrinsic viscosity of said xylene-soluble portion is from about 0.5 to about 7.0 dL/g; and
said xylene-soluble portion comprising from about 30 to about 70 mole percent ethylene units;
wherein from about 5 to about 40 mole percent of said ethylene units in said xylene-soluble portion exist in triads;
said impact copolymer composition being produced by in-reactor blending.
2. The composition of claim 1 , wherein the ratio of the weight average molecular weight of said xylene-soluble portion to that of said xylene-insoluble portion is from about 0.8 to about 1.6.
3. The composition of claim 1 , wherein the ratio of the weight average molecular weight of said xylene-soluble portion to that of said xylene-insoluble portion is from about 0.9 to about 1.3.
4. The composition of claim 1 , wherein the intrinsic viscosity of said xylene-soluble portion is from about 1.0 to about 3.0 dL/g.
5. The composition of claim 1 , wherein the intrinsic viscosity of said xylene-soluble portion is from about 1.2 to about 1.6 dL/g.
6. The composition of claim 1 , wherein said xylene-soluble portion comprises from about 40 to about 60 mole percent ethylene units.
7. The composition of claim 1 , wherein said xylene-soluble portion comprises from about 45 to about 55 mole percent ethylene units.
8. The composition of claim 1 , wherein from about 10 to about 30 mole percent of said ethylene units exist in triads.
9. The composition of claim 8 , wherein from about 15 to about 25 mole percent of said ethylene units exist in triads.
10. The composition of claim 1 , wherein said composition has a melt flow rate in the range of 0.5 to 200 dg/min.
11. The composition of claim 10 , wherein the melt flow rate of said composition has been adjusted by controlled rheology.
12. The composition of claim 1 , wherein said composition comprises from about 10 wt. % to about 30 wt. % of a xylene-soluble portion and from about 70 wt. % to about 90 wt. % of a xylene-insoluble portion.
13. The composition of claim 12 , wherein said composition comprises from about 15 wt. % to about 25 wt. % of a xylene-soluble portion and from about 75 wt. % to about 85 wt. % of a xylene-insoluble portion.