Broad orthogonal distribution polyethylenes for films

Patent metadata

Field	Value
Publication number	US-12577334-B2
Application number	US-202017757000-A
Country	US
Kind code	B2
Filing date	Nov 18, 2020
Priority date	Dec 17, 2019
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

A polyethylene suitable for use in blown film can comprise ethylene derived units and C 3 to C 12 α-olefin derived units at 0.5 wt % to 10 wt % of the polyethylene and have a reversed-co-monomer index (RCI,m) of 35 to 100, a comonomer distribution ratio (CDR-2,m) of 1.20 to 1.80, and a weight average molecular weight (Mw) to number average molecular weight (Mn) of 5 to 7.

First claim

The invention claimed is:

1 . A method comprising:
reacting ethylene, a C 3 to C 12 α-olefin comonomer, and hydrogen in the presence of a mixed catalyst to form polyethylene comprising ethylene derived units and C 3 to C 12 α-olefin derived units at 0.5 wt % to 10 wt % of the polyethylene, wherein the polyethylene has: a reversed-co-monomer index (RCI,m) of 35 to 100; a comonomer distribution ratio (CDR-2,m) of 1.20 to 1.80; and a weight average molecular weight (Mw) to number average molecular weight (Mn) of 5 to 7; wherein the mixed catalyst comprises Compound IV and Compound V in a Compound IV and Compound V mole ratio of 70:30 to 90:10:

2 . The method of claim 1 , wherein the polyethylene has a % vinyls of 60% to 97%.

3 . The method of claim 1 , wherein the polyethylene has a % vinyls of 85% to 97%.

4 . The method of claim 1 , wherein the polyethylene has a density of 0.910 g/cm 3 to 0.940 g/cm 3 , an I 2 value of 0.8 g/10 min to 1.5 g/10 min, an I 21 value of 15 to 25 g/10 min, and an I 21 /I 2 ratio of 15 to 25.

5 . The method of claim 1 , wherein reacting is carried out at one or both of the following conditions: a reaction temperature of 150° F. (66° C.) to 200° F. (93° C.); and a reaction pressure of 200 psig to 400 psig.

6 . The method of a claim 1 , wherein reacting is carried out in a reactor wherein mole % ratio of comonomer to ethylene in the reactor is 0.005 to 0.030.

7 . The method of claim 1 , wherein reacting is carried out in a reactor wherein a ratio of ppm hydrogen to mole % ethylene in the reactor is 3.0 to 5.5.

8 . The method of claim 1 , wherein the polyethylene has one or more of the following properties:
(a) a Mw of 80,000 g/mol to 250,000 g/mol; (b) a Mn of 10,000 g/mol to 100,000 g/mol; (c) a Z-average molecular weight (Mz) of 200,000 g/mol to 300,000 g/mol; (d) a long chain branching factor (g′ vis ) of 0.9 to 1.1; and (e) a T 75 -T 25 value of 10° C. to 25° C.

9 . The method of claim 8 , wherein the polyethylene has all of the properties (a)-(f).

10 . The method of claim 1 , further comprising forming a film with a compound comprising the polyethylene.

11 . A film comprising:
polyethylene comprising ethylene derived units and C 3 to C 12 α-olefin derived units at 0.5 wt % to 10 wt % of the polyethylene wherein the polyethylene has a reversed-co-monomer index (RCI,m) of 35 to 100; a comonomer distribution ratio (CDR-2,m) of 1.20 to 1.80; a density of 0.910 g/cm 3 to 0.940 g/cm 3 , an I 2 value of 0.8 g/10 min to 1.5 g/10 min, an I 21 value of 15 to 25 g/10 min, and an I 21 /I 2 ratio of 15 to 25; and a weight average molecular weight (Mw) to number average molecular weight (Mn) of 5 to 7; wherein the film has a 1% secant flexural modulus in a machine direction (MD) of 30,000 psi to 45,000 psi, an Elmendorf tear in the MD of 200 g to 350 g, and a dart drop value of 200 g/mil to 1,000 g/mil.

12 . The film of claim 11 , wherein the film has a tensile yield strength in the MD of 1,000 psi to 2,000 psi.

13 . The film of claim 12 , wherein the polyethylene has one or more of the following properties:
(a) a Mw of 80,000 g/mol to 250,000 g/mol; (b) a Mn of 10,000 g/mol to 100,000 g/mol; (c) a Z-average molecular weight (Mz) of 200,000 g/mol to 300,000 g/mol; (d) a long chain branching factor (g′ vis ) of 0.9 to 1.1; and (e) a T 75 -T 25 value of 10° C. to 25° C.

14 . The film of claim 13 , wherein the polyethylene has all of the properties (a)-(f).

15 . A composition comprising:
polyethylene comprising ethylene derived units and C 3 to C 12 α-olefin derived units at 0.5 wt % to 10 wt % of the polyethylene and having a reversed-co-monomer index (RCI,m) of 55 to 70, a comonomer distribution ratio (CDR-2,m) of 1.20 to 1.80, and a ratio of weight average molecular weight to number average molecular weight (Mw/Mn) of 5 to 7.

16 . The composition of claim 15 , wherein the polyethylene further has one or more of the following properties:
(a) a Mw of 80,000 g/mol to 250,000 g/mol; (b) a Mn of 10,000 g/mol to 100,000 g/mol; (c) a Z-average molecular weight (Mz) of 200,000 g/mol to 300,000 g/mol; (d) a long chain branching factor (g′ vis ) of 0.9 to 1.1; and (e) a T 75 -T 25 value of 10° C. to 25° C.

17 . The composition of claim 16 , wherein the polyethylene has all of the properties (a)-(f).

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Holtcamp Matthew W
• Li Dongming
• Stevens Kevin A
• Mccullough Laughlin G

Classifications

• C08J2323/08

  Copolymers of ethene (C08J2323/16 takes precedence) · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08F2420/07

  Heteroatom-substituted Cp, i.e. Cp or analog where at least one of the substituent of the Cp or analog ring is or contains a heteroatom · CPC title

• C08F4/65912

  in combination with an organoaluminium compound · CPC title

• C08F4/65916

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