Polyolefin compositions, articles thereof, and methods thereof

Patent metadata

Field	Value
Publication number	US-11555104-B2
Application number	US-202016829748-A
Country	US
Kind code	B2
Filing date	Mar 25, 2020
Priority date	Apr 8, 2019
Publication date	Jan 17, 2023
Grant date	Jan 17, 2023

Abstract

The present disclosure relates to polymer compositions, articles formed from polymer compositions, methods of making polymer compositions, and methods of making articles including polymer compositions. In at least one embodiment, a composition includes: (1) an ethylene polymer, (2) a vinyl alcohol polymer or a polyamide, and (3) a polar polymer or a grafted polyolefin. A composition of the present disclosure may further include a polypropylene polymer. A polar polymer may be an ethylene-acrylic-acid-copolymer, ethylene acrylate copolymer, a polyvinyl acetate, or combination(s) thereof. In at least one embodiment, a film includes a composition having: (1) an ethylene polymer, (2) a vinyl alcohol polymer or a polyamide, and (3) a polar polymer or a grafted polyolefin.

First claim

What is claimed is:

1. A composition comprising:
(i) one or more ethylene polymers;
(ii) one or more vinyl alcohol polymers, one or more polyamides, or a combination thereof; and
(iii) at least one grafted propylene-based elastomer.

2. The composition of claim 1 , further comprising one or more polypropylene polymers.

3. The composition of claim 1 , further comprising one or more propylene-based elastomers.

4. The composition of claim 1 , wherein the composition further comprises a polar polymer selected from an ethylene-acrylic-acid-copolymer, ethylene acrylate copolymer, an ethylene polyvinyl acetate, and combination(s) thereof.

5. The composition of claim 4 , wherein the composition comprises an ethylene-acrylic-acid-copolymer having an acrylic acid content of from about 11 wt % to 15 wt %.

6. The composition of claim 1 , wherein the propylene-based elastomer is the grafted product of a propylene-based elastomer and a maleic anhydride grafting monomer.

7. The composition of claim 1 , wherein the propylene-based elastomer has an ethylene content from about 14 mole % to 21 mole %.

8. The composition of claim 1 , wherein the propylene-based elastomer has a weight average molecular weight of from about 80,000 g/mol to about 500,000 g/mol.

9. The composition of claim 1 , wherein the propylene-based elastomer has a Mooney viscosity ML (1+4)@125° C. less than 30.

10. The composition of claim 1 , wherein the propylene-based elastomer has a density of from about 0.85 g/cm 3 to about 0.9 g/cm 3 , according to ASTM D1505.

11. The composition of claim 1 , wherein the propylene-based elastomer has one or more of the following properties:
(1) an ethylene content of about 16 wt % with the balance being propylene,
(2) a density of about 0.862 g/cm 3 (ASTM D1505),
(3) a melt index of about 1.4 g/10 min (ASTM D1238; 190° C., 2.16 kg), and
(4) a melt mass flow rate of about 3 g/10 min (230° C., 2.16 kg).

12. The composition of claim 1 , wherein the grafted propylene-based elastomer has a maleic anhydride concentration of from about 0.4 wt % to about 2 wt %, based on the total weight of the grafted propylene-based elastomer.

13. The composition of claim 1 , wherein the grafted propylene-based elastomer has a melt flow rate of from about 20 g/min to about 52 g/min, per ASTM D1238 (190° C.; 2.16 kg).

14. The composition of claim 1 , wherein the composition further comprises a grafted ethylene-based plastomer and/or a grafted high-density polyethylene.

15. The composition of claim 1 , wherein the composition further comprises a grafted ethylene-based plastomer.

16. The composition of claim 1 , wherein the composition further comprises grafted high-density polyethylene.

17. The composition of claim 1 , wherein the composition further comprises a grafted polypropylene homopolymer having one or more of the following properties:
a density of from about 0.89 g/cm 3 to about 0.91 g/cm 3 ,
an MFR (190° C., 1.2 kg) of from about 80 g/10 min to about 170 g/10 min, and
a grafting level of from about 0.5 wt % to about 1 wt %.

18. The composition of claim 2 , wherein the composition comprises a combined amount of the polyethylene and the polypropylene from about 60 wt % to about 95 wt %, based on the total weight of the composition.

19. The composition of claim 1 , wherein the amount of the propylene-based elastomer in the composition is about 1 wt % to about 7 wt %, based on the total weight of the composition.

20. The composition of claim 1 , wherein the composition comprises an amount of the vinyl alcohol polymer or polyamide of from about 0.2 wt % to about 36 wt %.

21. The composition of claim 2 , wherein the composition has a ratio (by weight) of (polyethylene+polypropylene) to (grafted propylene-based elastomer) from about 95:5 to about 75:25.

22. The composition of claim 1 , wherein the composition has a ratio (by weight) of (vinyl alcohol polymer or polyamide) to (grafted propylene-based elastomer) from about 89:11 to about 66:34.

23. The composition of claim 1 , wherein a ratio (by weight) of (polyethylene+polypropylene) to (vinyl alcohol polymer or polyamide) from about 75:25 to about 50:50.

24. The composition of claim 1 , wherein the composition comprises a vinyl alcohol polymer that is EVOH, and the composition comprises a polyamide, wherein a ratio (by weight) of the polyamide to EVOH is from about 100:0 to about 0:100.

25. The composition of claim 1 , wherein a portion of the composition having an area of 1 mm 2 has a submicron domain content of 90% or greater per mm 2 , based on the total number of microdomains of the portion, according to Scanning Electron Microscopy.

26. A film comprising the composition of claim 1 .

27. The film of claim 26 , wherein the melt from such film has a melt strength of from about 5 to about 540 cN, when measured at 190° C.

28. The film of claim 26 , wherein the melt from such film has an averaged 1% Secant Modulus (M), at 23° C. according to modified ASTM D882-18, of from about 170 MPa to about 520 MPa.

29. The film of claim 26 , wherein the film has one or more of the following properties:
(a) an Elmendorf Tear (MD) value, in accordance with ASTM D-1922, of from about 15 g/mil to about 250 g/mil;
(b) an Elmendorf Tear (TD) value, in accordance with ASTM D-1922, of from about 200 g/mil to about 760 g/mil;
(c) a Dart Drop Impact, in accordance with ASTM D-1709, method A, of from about 25 g/mil to about 190 g/mil;
(d) an Elongation at Break (MD) of from about 350% to about 750%, in accordance with modified ASTM D882-18;
(e) an Elongation at Break (TD) of from about 9% to about 720%, in accordance with modified ASTM D882-18;
(f) a puncture energy at break energy, in accordance with CEN 14477, of about 0.0.033 mJ/μm to about 0.012 mJ/μm;
(g) a force at break energy (MD), in accordance with modified ASTM D882-18, of from about 20 MPa to about 45 MPa;
(h) a force at break energy (TD), in accordance with modified ASTM D882-18, of from about 91 MPa to about 40 MPa;
(i) a puncture maximum, in accordance with CEN 14477, of from about 25 mN/μm to about 47 mN/μm;
(j) a puncture ε break, in accordance with CEN 14477, of from about 1.8 mm to about 3.9 mm;
(k) a haze value of 15% or less, in accordance with ASTM D-1003;
(l) a clarity of about 90% or greater, in accordance with ASTM D1746; and
(m) a gloss of about 50% or greater, in accordance with ASTM D-2457.

30. The composition of claim 1 , wherein the amount of the propylene-based elastomer in the composition is about 0.2 wt % to about 20 wt %, the propylene-based elastomer comprises about 68 mol % to about 92 mol % propylene-derived units and about 8 mol % to about 32 mol % ethylene-derived units, based upon the entire weight of the propylene-based elastomer, and wherein the propylene-based elastomer has a triad tacticity of greater than 80%, a melt enthalpy, as determined by DSC, of about 1 J/g to about 50 J/g, and a melting point, as measured by DSC, of about 50° C. to about 120° C.

Assignees

• Exxonmobil Chemical Patents Inc
• Exxonmobil Chemicals Patents Inc

Inventors

• Szala Caroline N
• Machado Martin
• Martin-Gatius Michael
• Laun Joachim F
• Van Den Bossche Linda M

Classifications

• C08L2207/062

  HDPE · CPC title

• C08L29/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L23/0869

  with unsaturated acids, e.g. [meth]acrylic acid; with unsaturated esters, e.g. [meth]acrylic acid esters · CPC title

• C08L51/003

  grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds (C08L51/04, C08L51/06 take precedence) · CPC title