Low coefficient of friction ethylene-based compositions

Patent metadata

Field	Value
Publication number	US-11466147-B2
Application number	US-201816619852-A
Country	US
Kind code	B2
Filing date	Jun 4, 2018
Priority date	Jun 9, 2017
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

The present disclosure provides a composition containing a polymeric blend. The polymeric blend contains (A) from 50 wt % to 90 wt % of a first ethylene-based polymer having a density from 0.895 g/cc to 0.905 g/cc; and a melt index from 0.1 g/10 min to 50 g/10 min; (B) from 8 wt % to 48 wt % of a second ethylene-based polymer having a density from 0.935 g/cc to 0.967 g/cc; and a melt index from 0.1 g/10 min to 180 g/10 min; and from 0.01 wt % to 2.0 wt % of a slip agent, based on the total weight of the polymeric blend. The polymeric blend has (i) an overall density from 0.900 g/cc to 0.925 g/cc; and (ii) a coefficient of friction (COF) after aging for 1 week at 60° C. from 0.001 to 0.400. The present disclosure also provides a multilayer film with a first layer containing the composition.

First claim

We claim:

1. A composition comprising:
a polymeric blend comprising
(A) from 50 wt % to 90 wt % of a first ethylene-based polymer having a density from 0.895 g/cc to 0.905 g/cc; and a melt index from 0.1 g/10 min to 50 g/10 min;
(B) from 8 wt % to 48 wt % of a second ethylene-based polymer having a density from 0.935 g/cc to 0.967 g/cc; and a melt index from 0.1 g/10 min to 180 g/10 min;
(C) from 0.01 wt % to 2.0 wt % of a slip agent, based on the total weight of the polymeric blend;

the polymeric blend having (i) an overall density from 0.900 g/cc to 0.925 g/cc; and (ii) a coefficient of friction (COF) after aging for 1 week at 60° C. from 0.001 to 0.400.

2. The composition of claim 1 , wherein the polymeric blend has a difference between the density of the first ethylene-based polymer and the density of the second ethylene-based polymer (Δ Density) from 0.039 g/cc to 0.065 g/cc.

3. The composition of claim 1 , wherein the polymeric blend has a difference between the melt index of the first ethylene-based polymer and the melt index of the second ethylene-based polymer (Δ MI) from 0 g/10 min to 155 g/10 min.

4. The composition of claim 1 , wherein the slip agent is selected from the group consisting of a fatty acid amide, a silicone, and combinations thereof.

5. The composition of claim 1 , wherein the slip agent is a fatty acid amide.

6. The composition of claim 1 , wherein the first ethylene-based polymer is an ethylene/octene copolymer having a density from 0.897 g/cc to 0.902 g/cc, and the second ethylene-based polymer is an ethylene/octene copolymer having a density from 0.942 g/cc to 0.958 g/cc.

7. The composition of claim 1 , wherein the polymeric blend comprises:
(A) from 50 wt % to 85 wt % of the first ethylene-based polymer, the first ethylene-based polymer having a density from 0.897 g/cc to 0.902 g/cc;
(B) from 8 wt % to 30 wt % of the second ethylene-based polymer, the second ethylene-based polymer having a density from 0.942 g/cc to 0.958 g/cc;
(C) from 0.01 wt % to 2.0 wt % erucamide; and

the overall density of the polymeric blend is from 0.905 g/cc to 0.920 g/cc.

8. A multilayer film comprising a first layer comprising the composition of claim 1 .

9. The multilayer film of claim 8 , wherein the first layer has a coefficient of friction (COF) after aging for 1 week at 60° C. from 0.050 to 0.400.

10. The multilayer film of claim 8 , wherein the first layer has an initial COF from 0.001 to 0.400.

11. The multilayer film of claim 8 , wherein the first layer has an initial surface roughness from 10 nm to 40 nm.

12. The multilayer film of claim 8 , wherein the first layer has a surface roughness after aging for 1 week at 60° C. from 10 nm to 45 nm.

13. The multilayer film of claim 8 , wherein the first layer has a light transmission from 90% to 100% and a haze from 0.5% to 30%.

14. The multilayer film of claim 8 , wherein the first layer is a seal layer.

15. The composition of claim 2 wherein the composition has an initial coefficient of friction from 0.001 to 0.200.

16. A composition comprising:
a polymeric blend comprising
(A) from 50 wt % to 90 wt % of a first ethylene-based polymer having a density from 0.895 g/cc to 0.905 g/cc; and a melt index from 0.1 g/10 min to 50 g/10 min;
(B) from 8 wt % to 48 wt % of a second ethylene-based polymer having a density from 0.935 g/cc to 0.967 g/cc; and a melt index from 0.1 g/10 min to 180 g/10 min;
(C) from 0.01 wt % to 2.0 wt % of a slip agent, based on the total weight of the polymeric blend;

the polymeric blend having
(i) an overall density from 0.900 g/cc to 0.925 g/cc;
(ii) a difference between the density of the first ethylene-based polymer and the density of the second ethylene-based polymer (Δ Density) from 0.039 g/cc to 0.065 g/cc;
(iii) an initial coefficient of friction from 0.001 to 0.200; and
(iv) a coefficient of friction (COF) after aging for 1 week at 60° C. from 0.001 to 0.400.

17. The composition of claim 16 comprising 0.01 wt % to 1.0 wt % of the slip agent that is a fatty acid amide.

18. The composition of claim 17 wherein the polymeric blend has a difference between the melt index of the first ethylene-based polymer and the melt index of the second ethylene-based polymer (Δ MI) from 0 g/10 min to 155 g/10 min.

19. A multilayer film comprising a first layer comprising the composition of claim 18 , the first layer having a heat seal initiation temperature from 65° C. to 85° C.

20. The multilayer film of claim 19 , wherein the first layer has a surface roughness after aging for 1 week at 60° C. from 10 nm to 45 nm.

Assignees

• Dow Global Technologies Llc

Inventors

• Sharma Rahul
• Lee Jong-Young
• Weinhold Jeffrey D
• Kapur Mridula Babli

Classifications

• B32B2307/31

  Heat sealable · CPC title

• C08L23/0815 Primary

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

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• B32B2307/538

  Roughness · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title