US 12,503,534 B2 · Bimodal linear low density polyethylene copolymer

Abstract

Provided are bimodal linear low density polyethylene copolymers (B-LLDPE copolymers) that have a combination of improved properties comprising at least one processability characteristic similar or better than that of an unblended monomodal ZN-LLDPE and a dart impact property similar or better than that of an unblended monomodal MCN-LLDPE. For the various aspects, the B-LLDPE copolymer has a density from 0.8900 to 0.9300 g/cm3; a melt index (I2) from 0.1 g/10 min. to 5 g/10 min.; a Mz from 600,000 to 1,900,000 g/mol; and a SHI from 5.35 to 75 η*(1.0)/η*(100). The B-LLDPE copolymer can be further characterized by a first melt flow ratio (I21/I2) from 32 to 140 and a first molecular weight ratio (Mz/Mw) from 4.5 to 11.

Claims15

Dependent claims

A bimodal linear low density polyethylene copolymer comprising:

a density from 0.915 to 0.920 gram per cubic centimeter (g/cm3) measured according to ASTM D792-13, Method B;
a melt index (I2) from 3.2 grams per 10 minutes (g/10 min.) to 3.6 g/10 min., measured according to the Melt Index Test Method at 190° C. and 2.16 kilograms according to ASTM D1238-13;
a melt flow ratio (I21/I2) from 60 to 140, measured according to the Melt Index Test Method at 190° C. and 21.6 and 2.16 kilograms, respectively, according to ASTM D1238-13;
a Mz from 800,000 to 1,200,000 grams per mole (g/mol), measured according to a Gel Permeation Chromatography (GPC) Test Method;
and
a shear thinning index (SHI) from 10 to 12 η*(1.0)/η*(100) measured according to SHI Test Method.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/915,575Filed 30 Mar 2021 · us provisional application

Priority

1 Apr 2020

Published

US 2023/0127331 A127 Apr 2023

Granted

23 Dec 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification12 codes

C08F 210/02
Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond: ethene
C08F 210/16
Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond: copolymers of ethene with alpha-alkenes, e.g. EP…
C08J 5/18
Manufacture of articles or shaped materials containing macromolecular substances: manufacture of films or sheets
C08F 4/659
Titanium, zirconium, hafnium or compounds thereof: component covered by group C08F4/64 containing a transition metal-carbon bond

Family

Application63/003,288Us provisional application · filed 1 Apr 2020

Application63/031,776Us provisional application · filed 29 May 2020

Application63/031,801Us provisional application · filed 29 May 2020

US 2023/0127331 A1Pre-grant publication · published 27 Apr 2023

US 12,503,534 B2This patent

From the US filing history. Foreign family members aren’t listed.

Bimodal linear low density polyethylene copolymer

Life of this patent

Bimodal linear low density polyethylene copolymer

Life of this patent

Abstract

Claims15