Thermoplastic polyolefin blends including block composites as compatibilizers

Patent metadata

Field	Value
Publication number	US-11292897-B2
Application number	US-201716306130-A
Country	US
Kind code	B2
Filing date	May 24, 2017
Priority date	May 31, 2016
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A composition comprising (A) from 10 wt % to 90 wt % of a propylene component including at least one propylene based polymer having a propylene content of at least 50.0 wt %, based on the total weight of the propylene based polymer, and a melt flow rate from 0.5 g/10 min to 200.0 g/10 min (ASTM D-1238 at 230° C., 2.16 kg); (B) from 1 wt % to 60 wt % of a polyolefin elastomer; (C) from 1 wt % to 20 wt % of a block composite comprising (i) an ethylene-propylene copolymer, (ii) an isotactic polypropylene copolymer, and (iii) a block copolymer including an ethylene-propylene soft block that has a same composition as the ethylene-propylene copolymer of the block composite and an isotactic polypropylene hard block that has a same composition as the isotactic polypropylene copolymer of the block composite; and (D) optionally, from 0.1 wt % to 10 wt % of an antioxidant.

First claim

What is claimed is:

1. A composition comprising:
(A) from 10 wt % to 90 wt % of a propylene component including at least one propylene based polymer having a propylene content of at least 50.0 wt %, based on the total weight of the propylene based polymer, and a melt flow rate from 0.5 g/10 min to 200.0 g/10 min (ASTM D-1238 at 230° C., 2.16 kg);
(B) from 1 wt % to 60 wt % of a polyolefin elastomer; and
(C) from 1 wt % to 20 wt % of a block composite comprising (i) an ethylene-propylene copolymer, (ii) an isotactic polypropylene copolymer, and (iii) a block copolymer including an ethylene-propylene soft block that has a same composition as the ethylene-propylene copolymer of the block composite and an isotactic polypropylene hard block that has a same composition as the isotactic polypropylene copolymer of the block composite,
wherein the composition further comprises a melt flow rate of greater than or equal to 7.0 g/10 min (ASTM D-1238 at 230°C., 2.16 kg).

2. The composition of claim 1 , further comprising (D) from 0.1 wt % to 10 wt % of an antioxidant.

3. The composition of any of the preceding claims, wherein the block composite has a density of from 0.860 to 0.890 g/cc (ASTM D792) and a melt flow rate of from 1 g/10 min to 20 g/10 min (ASTM D-1238 at 230° C., 2.16 kg).

4. The composition of any of the preceding claims, wherein the polyolefin elastomer has a density of from 0.855 to 0.875 g/cc (ASTM D792) and a melt index of from 0.1 g/10 min to 20 g/10 min (ASTM D-1238 at 230° C., 2.16 kg).

5. The composition of any of the preceding claims, further comprising a notched impact of greater than or equal to 70.0 kJ/m 2 at −30° C.

6. The composition of any of the preceding claims, further comprising a notched impact of greater than or equal to 85.0 kJ/m 2 at −35° C.

7. The composition of any of the preceding claims, further comprising a notched impact of greater than 70.0 kJ/m 2 at −40° C.

8. The composition of any of the preceding claims, further comprising a notched impact of greater than or equal to 52.0 kJ/m 2 at −45° C.

9. The composition of any of the preceding claims, further comprising:
a flexural modulus of greater than 370 MPa;
a flexural yield strength of greater than 10 MPa;
a tensile yield strength of greater than or equal to 12 MPa at room temperature; and
a tensile yield strength of greater than or equal to 33 MPa at −40° C.

10. An article made from the composition of any of the preceding claims.

Assignees

• Dow Global Technologies Llc

Inventors

• Henschke Olaf
• Zhang Yahong
• Li Wei
• Wu Hang
• Ohmura Takahiko
• Hu Yushan
• Ming Ming
• Jeltsch Krischan

Classifications

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title

• C08L23/16

  Ethylene-propylene or ethylene-propylene-diene copolymers · CPC title

• C08L23/10 Primary

  Homopolymers or copolymers of propene · CPC title

• C08L2207/02

  Heterophasic composition · CPC title

• C08F10/06

  Propene · CPC title