Ethylene polymer, stretched molded article and microporous membrane

Patent metadata

Field	Value
Publication number	US-10947361-B2
Application number	US-201715778706-A
Country	US
Kind code	B2
Filing date	Oct 25, 2017
Priority date	Nov 8, 2016
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

The present invention presents an ethylene polymer, wherein the ethylene polymer has a weight average molecular weight (Mw) of 200,000 or more and 3,000,000 or less, a proportion of a component (α130) with the lowest mobility of 40% or more and 60% or less, and a ratio β/γ of a middle motion component (β) to a component (γ) with the highest mobility of 1.0 or more and 4.0 or less when a three-component approximation of free induction decay at 130° C. measured by a solid echo method of pulse NMR is performed.

First claim

The invention claimed is:

1. An ethylene polymer, wherein the ethylene polymer has
a weight average molecular weight (Mw) of 200,000 or more and 3,000,000 or less,
a proportion of a component (α130) with the lowest mobility of 40% or more and 60% or less and a ratio β/γ of a proportion of a middle motion component (β) to a proportion of a component (γ) with the highest mobility of 1.0 or more and 4.0 or less when a three-component approximation of free induction decay at 130° C. measured by a solid echo method of pulse NMR is performed, wherein the ethylene polymer has a molecular weight distribution (Mw/Mn) of 5 or more and 15 or less, and wherein the ethylene polymer has a content of one or more selected from the group consisting of Ti, Mg and Al of 50 ppm or less.

2. The ethylene polymer according to claim 1 , wherein the ethylene polymer has a ratio (α130/(α30) of a proportion of the component (α130) with the lowest mobility measured at 130° C. to a proportion of a component (α30) with the lowest mobility measured at 30° C. by the solid echo of pulse NMR of 0.1 or more and 0.65 or less.

3. The ethylene polymer according to claim 1 , wherein the ethylene polymer has a weight average molecular weight (Mw) of 250,000 or more and 800,000 or less.

4. The ethylene polymer according to claim 1 , wherein a shape of the ethylene polymer is powder.

5. The ethylene polymer according claim 1 , wherein the ethylene polymer has a particle size ratio D90/D10 measured using a laser particle size meter of 1.30 to 1.80.

6. A stretched molded article, comprising the ethylene polymer according to claim 1 .

7. A microporous membrane, comprising the ethylene polymer according to claim 1 .

8. A stretched molded article, comprising the ethylene polymer according claim 2 .

9. A microporous membrane, comprising the ethylene polymer according claim 2 .

10. A stretched molded article, comprising the ethylene polymer according claim 3 .

11. A microporous membrane, comprising the ethylene polymer according claim 3 .

12. A stretched molded article, comprising the ethylene polymer according claim 4 .

13. A microporous membrane, comprising the ethylene polymer according claim 4 .

14. A stretched molded article, comprising the ethylene polymer according claim 5 .

15. A microporous membrane, comprising the ethylene polymer according claim 5 .

Assignees

• Asahi Chemical Ind

Inventors

• Mochizuki Shinsuke
• Takeyama Hidenobu

Classifications

• G01N24/08

  by using nuclear magnetic resonance (G01N24/12 takes precedence) · CPC title

• C08J3/12

  Powdering or granulating · CPC title

• C08F2420/02

  Cp or analog bridged to a non-Cp X anionic donor · CPC title

• C08F2410/01

  Additive used together with the catalyst, excluding compounds containing Al or B · CPC title

• C08F4/65916

  supported on a carrier, e.g. silica, MgCl2, polymer · CPC title