BI- OR MULTIMODAL POLYETHYLENE WITH LOW UNSATURATION LEVEL

• US 20190330397A1
• Filed: 06/12/2017
• Published: 10/31/2019
• Est. Priority Date: 06/17/2016
• Status: Abandoned Application

• Current Assignee: Borealis AG (Government of ABU Dhabi)
• Original Assignee: Borealis AG (Government of ABU Dhabi)
• Inventors: Galgali, Girish Suresh
• Application Number:
  US16/310,549
• Publication Number:
  US 20190330397A1
• Time in Patent Office: Days
• CPC Class Codes: C08F 2/001 Multistage polymerisation processes characterised by a change in reactor conditions without deactivating the intermediate polymer C08F295/00, C08F297/00 take precedence
• CPC Class Codes: C08F 210/08 Butenes
• CPC Class Codes: C08F 210/14 Monomers containing five or more carbon atoms
• CPC Class Codes: C08F 210/16 Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
• CPC Class Codes: C08F 2500/05 Bimodal or multimodal molecular weight distribution
• CPC Class Codes: C08F 2500/12 Melt flow index or melt flow ratio
• CPC Class Codes: C08F 2500/28 Internal unsaturations
• CPC Class Codes: C08F 2500/29 Terminal unsaturations, e.g. vinyl or vinylidene
• CPC Class Codes: C08F 4/65912 in combination with an organoaluminium compound
• CPC Class Codes: C08F 4/65916 supported on a carrier, e.g. silica, MgCl2, polymer
• CPC Class Codes: C08F 4/65927 two cyclopentadienyl rings being mutually bridged
• CPC Class Codes: C08J 2323/08 Copolymers of ethene C08J2323/16 takes precedence
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: C08L 2203/16 used for films
• CPC Class Codes: C08L 2205/025 containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
• CPC Class Codes: C08L 23/0815 Copolymers of ethene with aliphatic 1-olefins
• CPC Class Codes: C08L 2314/06 Metallocene or single site catalysts

Abstract

New bi- or multimodal polyethylene terpolymer made with a metallocene catalyst having a narrow molecular weight distribution and a low unsaturation level.

Claims

1. A bi- or multimodal polyethylene terpolymer comprising a terpolymer of ethylene and two different comonomers, wherein the two different comonomers are selected from alpha olefins having from 4 to 10 carbon atoms, and wherein the bi- or multimodal polyethylene terpolymer is produced with a metallocene catalyst, wherein the bi- or multimodal polyethylene terpolymer has

(a) an MFR₂ of 2.0-5.0 g/10 min (according to ISO 1133 at 190°

C. under 2.16 kg load),

(b) an MWD (Mw/Mn) of 5 or less,

(c) a density of 915 to 930 kg/m³ (according to ISO

     1183),

(d) an unsaturation level Rv of below 0.40 and being defined as

2. The bi- or multimodal polyethylene terpolymer according to claim 1, wherein the two different comonomers are 1-butene and 1-hexene.

3. The bi- or multimodal polyethylene terpolymer according to claim 1, wherein the bi- or multimodal polyethylene terpolymer is bi- or multimodal with respect to comonomer type and/or comonomer content (mol %), wherein the first ethylene polymer component comprises a first alpha-olefin comonomer having from 4 to 10 carbon atoms, wherein the second ethylene polymer component comprises a second alpha-olefin comonomer having from 4 to 10 carbon atoms, and wherein the first alpha-olefin comonomer of the first ethylene polymer component is different than the second alpha-olefin comonomer of the second ethylene polymer component.

4. The bi- or multimodal polyethylene terpolymer according to claim 3, wherein the first ethylene polymer component has an amount (mol %) of comonomer, the second ethylene polymer component has an amount (mol %) of comonomer, the amount of comonomer in the first ethylene polymer component is lower than the amount of comonomer in the second ethylene polymer component, and the amount of comonomer in the first ethylene polymer component is from 0.1 to 2.5 mol %.

5. The bi- or multimodal polyethylene terpolymer according to claim 3, wherein the first alpha-olefin comonomer of the first ethylene polymer component is 1-butene and the second alpha-olefin comonomer of the second ethylene polymer component is 1-hexene.

6. The bi- or multimodal polyethylene terpolymer according to claim 1, wherein the bi- or multimodal polyethylene terpolymer is bi- or multimodal with respect to density of the first ethylene polymer component and the second ethylene polymer component, whereby the first ethylene polymer component has a first density, the second ethylene polymer component has a second density, the first density of the first ethylene polymer component is higher than the second density of the second ethylene polymer component, and the first density of the first ethylene polymer component is from 930 to 950 kg/m³.

7. A polymer composition comprising the bi- or multimodal polyethylene terpolymer according to claim 1.

8. A method of use of the bi- or multimodal polyethylene terpolymer according to claim 1, the method comprising using the bi- or multimodal polyethylene terpolymer in cast film applications.

9. A cast film comprising the bi- or multimodal polyethylene terpolymer according to claim 1.

10. The polymer composition of claim 7, further comprising a further polymer component, an additive, a filler, or a combination thereof.