Polymer compositions and articles made therefrom

Patent metadata

Field	Value
Publication number	US-9908981-B2
Application number	US-201414902212-A
Country	US
Kind code	B2
Filing date	Aug 20, 2014
Priority date	Sep 30, 2013
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

Provided are blend compositions comprising a propylene-based elastomer and a polyalphaolefin. The blend compositions may be particularly useful in elastic film compositions, and especially useful as elastic film layers in nonwoven laminates. The film may comprise a blend of from about 0.5 to about 60 wt % of a polyalphaolefin and 40 to 99.5 wt % of a propylene-based elastomer. The film may comprise a blend of a propylene-base elastomer that comprises propylene and from 5 to 30 wt % of an α-olefin and a polyalphaolefin having a kinematic viscosity (KV) at 100° C. of from 3 to 3000 cSt.

First claim

What is claimed is:

1. A film comprising a blend of from about 0.5 to about 60 wt % of a polyalphaolefin and 40 to 99.5 wt % of a propylene-based elastomer,
where the propylene-based polymer elastomer is a reactor blend of a first polymer component and a second polymer component, wherein the first polymer component comprises propylene and an α-olefin and has an α-olefin content R 1 of from greater than 5 to less than 30 wt % α-olefin, where the percentage by weight is based upon the total weight of the propylene-derived and α-olefin derived units of the first polymer component, and wherein the second polymer component comprises propylene and α-olefin and has an α-olefin content R 2 of from greater than 1 to less than 10 wt % α-olefin, where the percentage by weight is based upon the total weight of the propylene-derived and α-olefin derived units of the second polymer component, wherein the propylene-based elastomer has a melt temperature less than or equal to about 120° C.

2. The film of claim 1 , wherein the total α-olefin content of the propylene-based elastomer is from 5 to 30 wt % α-olefin, where the percentage by weight is based upon the total weight of the propylene-derived and α-olefin derived units of the propylene-based elastomer.

3. The film of claim 1 , wherein the first polymer component has an α-olefin content R 1 of from 10 to 25 wt % α-olefin.

4. The film of claim 1 , wherein the second polymer component has an α-olefin content R 2 of from greater than 2 to less than 8 wt % α-olefin.

5. The film of claim 1 , wherein the propylene-based elastomer comprises from 1 to 25 wt % of the second polymer component and from 75 to 99 wt % of the first polymer component, based on the weight of the propylene-based elastomer.

6. The film of claim 1 , wherein the propylene-based elastomer has a triad tacticity greater than about 75%.

7. The film of claim 1 , wherein the propylene-based elastomer has a heat of fusion less than about 75 J/g.

8. The film of claim 1 , wherein the α-olefin of the first reactor component is ethylene.

9. The film of claim 1 , wherein the α-olefin of the second reactor component is ethylene.

10. The film of claim 1 , wherein the polyalphaolefin comprises oligomers of α-olefins having from 5 to 24 carbon atoms.

11. The film of claim 1 , wherein the polyalphaolefin comprises oligomers of 1-octene, 1-decene, 1-dodecene, and blends thereof.

12. The film of claim 1 , wherein the polyalphaolefin has a weight average molecular weight (Mw) of less than 5,000 g/mole.

13. The film of claim 1 , wherein the polyalphaolefin has a kinematic viscosity (KV) at 100° C. of from 3 to 3000 cSt.

14. The film of claim 1 , wherein the polyalphaolefin has a kinematic viscosity (KV) at 100° C. of from 5 to 1000 cSt.

15. The film of claim 1 , wherein the polyalphaolefin has a kinematic viscosity (KV) at 100° C. of from 5 to 100 cSt.

16. The film of claim 1 , wherein the film comprises 1 to about 40 wt % of the polyalphaolefin and 60 to 99 wt % of the propylene-based elastomer.

17. The film of claim 1 , wherein the film comprises 1 to 20 wt % of the polyalphaolefin and 80 to 99 wt % of the propylene-based elastomer.

18. The film of claim 1 , wherein the film consists essentially of the polyalphaolefin and the propylene-based elastomer.

19. The film of claim 1 , wherein the film has a first-cycle hysteresis loading stress at 100% strain of less than 5 MPa.

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Williams M Glenn

Classifications

• B32B27/327

  comprising polyolefins obtained by a metallocene or single-site catalyst · CPC title

• B29K2023/10

  Polymers of propylene · CPC title

• C08L23/16

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

• B32B27/32

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

• B32B2270/00

  Resin or rubber layer containing a blend of at least two different polymers · CPC title