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Silicone enhanced ethylene/alpha-olefin interpolymers for improved stiffness-toughness balance

An olefin interpolymer, ethylene technology, applied in the field of silicone-reinforced ethylene/α-olefin interpolymers for improving rigidity-toughness balance, can solve problems such as inability to improve physical properties of TPO compositions

Pending Publication Date: 2021-05-14
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such PDMS / silicone-incorporated formulations failed to improve other physical properties of TPO compositions, such as stiffness-toughness balance and melt flow

Method used

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  • Silicone enhanced ethylene/alpha-olefin interpolymers for improved stiffness-toughness balance
  • Silicone enhanced ethylene/alpha-olefin interpolymers for improved stiffness-toughness balance
  • Silicone enhanced ethylene/alpha-olefin interpolymers for improved stiffness-toughness balance

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Embodiment Construction

[0009] As described herein, compositions have been found to provide excellent low temperature impact (toughness), excellent stiffness (flexural modulus), and improved melt flow (melt flow rate) in TPO applications. These compositions have excellent rigidity and low temperature toughness while significantly increasing melt flow rate to maintain good processability.

[0010] As discussed above, there is provided a composition comprising:

[0011] A) Ethylene / α-olefin interpolymers having from 0.854 to 0.890 g / cc, or from 0.855 g / cc to 0.885 g / cc, or from 0.860 g / cc to 0.880 g / cc, or from 0.865 g / cc to 0.875 g / cc(1g / cc=1g / cm 3 ) density and a melt index (I2) of 0.2 to 30g / 10min, or 0.3 to 20g / 10min, or 0.4 to 10g / 10min, or 0.5 to 5.0g / 10min, or 0.5 to 2.0g / 10min;

[0012] B) a silicone oil having a viscosity at 25°C of ≤ 5000 cSt, or ≤ 4000 cSt, or ≤ 3000 cSt, or ≤ 2000 cSt, or ≤ 1000 cSt, or ≤ 500 cSt; and

[0013] Wherein component B is present in an amount of 1.0 wt% to 5....

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Abstract

A composition comprising the following: A) an ethylene / alpha-olefin interpolymer having a density from 0.854 to 0.890 g / cc, and a melt index (I2) from 0.2 to 30 g / 10 min; B) a silicone oil having a viscosity <= 5000 cSt, at 25oC; and wherein component B is present in an amount from 1.0 wt% to 5.0 wt%, based on the weight of the sum weight of components A and B.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Application No. 62 / 724,113, filed August 29, 2018, which is incorporated herein by reference in its entirety. Background technique [0003] Ethylene / alpha-olefin elastomers have been used as impact modifiers for polypropylene for decades, especially for talc-filled polypropylene compositions commonly referred to as TPO compositions. TPO compositions are ubiquitous in the automotive industry, where they are used to make interior and exterior automotive parts such as bumpers, interior door panels, air bag covers, and many other components. Elastomeric compositions are needed to further improve the low temperature impact properties and melt flow of TPO compositions. Currently, lower density and higher melt index elastomers have been developed for this purpose; however, such elastomers often reduce TPO stiffness and are difficult to maintain in free-flowing pellet form due to Es...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16
CPCC08L23/16C08L2205/035C08L23/12C08L83/04C08K3/34C08L23/0815
Inventor 吴高翔J·C·芒罗
Owner DOW GLOBAL TECH LLC
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