Polyolefin compositions having improved volume resistivity

Patent metadata

Field	Value
Publication number	US-12384906-B2
Application number	US-201917638431-A
Country	US
Kind code	B2
Filing date	Aug 30, 2019
Priority date	Aug 30, 2019
Publication date	Aug 12, 2025
Grant date	Aug 12, 2025

Abstract

The present disclosure relates to a curable composition comprising: (A) a polyolefin; (B) siliceous earth; (C) a crosslinking agent; (D) a crosslinking co-agent; and, optionally, (E) an additive component, where the curable composition demonstrates improved electrical properties. The present disclosure further relates to a crosslinked polymer composition that is the reaction product of the curable composition, where improved electrical properties are demonstrated as well.

First claim

What is claimed is:

1. A curable composition comprising, based on the weight of the curable composition:
from 40 wt % to 84 wt % of a non-Ziegler Natta catalyzed polyolefin having a Mooney viscosity ML 1+4 at 125° C. from 5 MU to 50 MU, in accordance with ASTM 1646;
from 15 wt % to 40 wt % of siliceous earth;
from 0.01 wt % to 8 wt % of a crosslinking agent consisting of one or more organic peroxides;
from 0.01 wt % to 5 wt % of a crosslinking co-agent selected from the group consisting of: trimethylolpropane trimethacrylate (TRIM); triallyl cyanurate (TAC); triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione also known as triallyl isocyanurate (TAIC); hexaallyl melamine; triallyl phosphate (TAP); triallyl ortho formate; tetra-allyloxy-ethane; triallyl benzene-1,3,5-tricarboxylate; diallyl phthalate; diallyl terephthalate; zinc dimethacrylate; ethoxylated bisphenol A dimethacrylate, and combinations thereof; and
from 0.01 wt % to 20 wt % of an additive component comprising of an oxide of calcium, zinc, iron, titanium, and aluminum and further comprising an antioxidant and wherein the curable composition has a volume resistivity of greater than 3.0E+15 ohm·cm.

2. The curable composition of claim 1 , wherein the non-Ziegler Natta catalyzed polyolefin is selected from the group consisting of an ethylene/alpha-olefin/diene interpolymer, an ethylene/alpha-olefin interpolymer, an ethylene/alpha-olefin multi-block interpolymer, and a propylene/alpha-olefin interpolymer.

3. The curable composition of claim 1 , wherein the non-Ziegler Natta catalyzed polyolefin is an ethylene/propylene/diene interpolymer.

4. The curable composition of claim 1 , wherein the non-Ziegler Natta catalyzed polyolefin comprises vanadium in an amount of 0.4 ppm or less.

5. The curable composition of claim 1 , wherein the non-Ziegler Natta catalyzed polyolefin comprises a Group 4 metal in an amount of 0.3 ppm or greater.

6. The curable composition of claim 1 , wherein the polyolefin has a Mooney viscosity (ML 1+4 at 125° C.) from 10 MU to 40 MU, in accordance with ASTM D1646.

7. The curable composition of claim 1 , wherein the curable composition has a volume resistivity of greater than 7.0E+15 ohm·cm.

8. A crosslinked polymer composition comprising the reaction product of the curable composition of claim 1 .

9. The crosslinked polymer composition of claim 8 , wherein the crosslinked polymer composition has a volume resistivity of greater than 5E+15 ohm·cm.

10. An article comprising the crosslinked polymer composition of claim 8 .

11. An article comprising the curable composition of claim 1 .

12. The article of claim 11 , wherein the article has a volume resistivity of greater than 3.0E+15 ohm·cm.

Assignees

• Dow Global Technologies Llc

Inventors

• Yang Yunfeng
• Wu Xiaosong
• Lyu Bo
• Chen Yong
• Xu Xianmin
• Han Tao

Classifications

• C08L2312/00

  Crosslinking · CPC title

• C08L23/0815 Primary

  with aliphatic 1-olefins containing one carbon-to-carbon double bond · CPC title

• C08L23/16

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

• C08K3/22

  of metals · CPC title

• C08K5/0025

  Crosslinking or vulcanising agents; including accelerators · CPC title