Thermoplastic vulcanizate compositions

Patent metadata

Field	Value
Publication number	US-11905401-B2
Application number	US-202217728367-A
Country	US
Kind code	B2
Filing date	Apr 25, 2022
Priority date	Apr 10, 2018
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

In an embodiment, a thermoplastic vulcanizate (TPV) composition is provided. The TPV composition includes a thermoplastic polyolefin; and an ethylene based copolymer rubber, wherein the ethylene based copolymer rubber has: a Mw of from 500,000 g/mol to 3,000,000 g/mol, a Mw/Mn of 4.0 or lower, and a g′ vis of 0.90 or greater. In another embodiment, a TPV composition includes a thermoplastic phase and an ethylene-propylene-diene terpolymer, wherein the thermoplastic vulcanizate composition has: a hardness of from 20 Shore A to 60 Shore D; and a stress relaxation slope of −1 to −5 (l/min) as measured by an Elastocon stress relaxation instrument.

First claim

We claim:

1. A thermoplastic vulcanizate composition comprising:
a thermoplastic phase and an ethylene-propylene-diene terpolymer, wherein the thermoplastic vulcanizate composition has:
a hardness of from 20 Shore A to 60 Shore D; and
a stress relaxation slope of −1 to −5 (1/min) as measured according to ISO 3384A using a stress relaxation instrument.

2. The thermoplastic vulcanizate composition of claim 1 , wherein the composition has:
a hardness of from 40 Shore A to 80 Shore A; and
a stress relaxation slope of −2 to −4.5 (1/min) as measured according to ISO 3384A using a stress relaxation instrument.

3. The thermoplastic vulcanizate composition of claim 1 , wherein the composition has a G′ value (at 90° C., 0.6 rad/s, and 1% strain) of from 600 kPa to 2000 kPa.

4. The thermoplastic vulcanizate composition of claim 1 , wherein the composition has a tan δ value (at 215° C., 5.0 rad/s, and 100% strain) of from 0.25 to 1.0.

5. The thermoplastic vulcanizate composition of claim 1 , wherein the composition has a tan δ (at 90° C., 5 rad/s, and 1% strain) of from 0.3 to 1.

6. An extruded tape comprising:
the thermoplastic vulcanizate composition of claim 5 , wherein the thermoplastic vulcanizate composition has a surface roughness of from 30 μm to 150 μm.

7. The extruded tape of claim 6 , wherein the thermoplastic vulcanizate composition has a surface roughness of from 50 μm to 100 μm.

8. A method of forming an article comprising:
extruding, injection molding, blow molding, compression molding, or thermoforming the thermoplastic vulcanizate composition of claim 5 ; and
forming the article.

9. An article comprising the thermoplastic vulcanizate composition of claim 5 .

10. The article of claim 9 , wherein the article comprises a weather seal, a door panel, a gasket, a pipe seal, a hose, a belt, or a boot.

Assignees

• Celanese Int Corp

Inventors

• Doufas Antonios K
• Anantha Narayana Iyer Krishnan
• Jourdain Eric P
• Goncy Michael J
• Kirkendall Kelly
• Reyna Katya N

Classifications

• C08L23/16 Primary

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

• C08L23/30

  by oxidation · CPC title

• C08L23/32

  by reaction with compounds containing phosphorus or sulfur · CPC title

• C08L23/36

  by reaction with nitrogen-containing compounds, e.g. by nitration · CPC title

• C08L2205/22

  Mixtures comprising a continuous polymer matrix in which are dispersed crosslinked particles of another polymer · CPC title