# US 6,723,793 B2 · Blends of ethylenic polymers with improved modulus and melt strength and articles fabricated from these blends

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- Number: US 6,723,793 B2
- Document ID: US6723793B2
- Status: Granted
- Kind: B2
- Application number: 10/350,564
- Filed: 2003-01-24
- Published: 2003-09-04
- Granted: 2004-04-20
- Earliest claimed: 2001-03-09
- Assignees: Dow Global Technologies LLC
- Inventors: Thomas Oswald; Bharat I. Chaudhary; Jeffrey Weinhold
- Web page: https://patentgrep.com/patent/US6723793B2

## CPC

- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08L 23/02: not modified by chemical after-treatment
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2207/07: Long chain branching
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A blend which comprises; A) a heterogeneous or homogenous linear ethylene homopolymer or interpolymer; B) a branched homopolymer or interpolymer; wherein said blend has; 1) a melt index, I2, of about 0.05 to about 20 g/10 min; 2) a flexural modulus of ≧100,000 psi or ≦30,000 psi; 3) a melt strength of ≧2 cN; 4) a melt extensibility of ≧25 mm/sec; and 5) wherein said melt strength of said blend meets the following relationship; Melt strength≧FMS*[(f*A)+((1−f)*B)]; where: A=3.3814*(I2)−06476 and B=16.882*(I2)−06564; where I2 is the measured melt index of the blend; f is the weight fraction of the linear polyethylene in the blend and FMS is ≧1.1. Also included in the present invention are foams, films, fibers, blow molded articles, wire and cable articles and extrusion coatings comprising said blend.

## Claims

### Claim 1

A blend which comprises;
A) a heterogeneous or homogenous linear ethylene homopolymer or interpolymer;
B) a branched homopolymer or interpolymer;
wherein said blend has;
1) a melt index, I2, of about 0.05 to about 20 g/10 min;
2) a flexural modulus of ≦30,000 psi or ≦100,000 psi;
3) a melt strength of ≧2 eN;
4) a melt extensibility of ≧25 mm/sec; and
5) wherein said melt strength of said blend meets the following relationship; melt strength≧FMS*; where:
A=3.3814*(I2)−0.6476 and B=16.882(I2)−0.6564; where
I2 is the measured melt index of the blend; f is the weight fraction of the linear polyethylene in the blend and FMS is ≧1.1.

### Claim 2 (depends on 1)

The blend of claim 1 wherein
A) Component A has a melt index, I2, of less than about 60 g/10 min and is a heterogeneous or homogeneous linear ethylene homopolymer or heterogeneous or homogeneous linear interpolymer of ethylene with at least one C3-C20 α-olefin, and
B) Component B is selected from the group consisting of LDPE, EVA, and EAA; and
wherein said blend has;
1) a melt index, I2, of about 0.1 to about 10 g/10 min;
2) a flexural modulus of ≦25,000 psi;
3) a melt strength of ≧7 eN; and
4) a melt extensibility of ≧50 mm/sec; and
5) FMS is ≧1.25.

### Claim 3 (depends on 1)

The blend of claim 1 wherein
A) Component A has a melt index, I2, of less than about 30 g/10 mins, and is a linear or substantially linear ethylene homopolymer or a linear or substantially linear ethylene /C3-C8 α-olefin interpolymer; and
B) Component B is LDPE;
wherein said blend has;
1) a melt index, I2, of about 0.2 to about 7 g/10 min;
2) a flexural modulus of ≦20,000 psi.

### Claim 4 (depends on 3)

The blend of claim 3 wherein Component A has a melt index, I2, of less than about 15 g/10 min, and
wherein said blend has;
1) a melt index, I2, of about 0.5 to about 5 g/10 min; and
2) FMS is ≧2.5.

### Claim 5 (depends on 1)

A blend comprising the blend of claim 1 or claim 1, further comprising one or more additional polymers selected from the group consisting of low density polyethylene, high density polyethylene (HDPE), linear low density polyethylene (LLDPE), ethylene styrene itnerpolymers (ESI), polypropylene (PP), polystyrene (PS), ethylene-propylene rubber and styrene-butadiene rubber.