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

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.

Claims5

Dependent claims

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.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application

10/350,564Filed 24 Jan 2003 · division

Priority

9 Mar 2001

Published

US 2003/0032731 A14 Sep 2003

Granted

20 Apr 2004

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

C08L 23/0815
With unsaturated hydrocarbons only containing four or more carbon atoms: with aliphatic 1-olefins containing one carbon-to-carbon double bond
C08L 23/02
Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of…:…
C08L 2205/02
Polymer mixtures characterised by other features: containing two or more polymers of the same C08L -group
C08L 2207/07
Properties of polyethylene: long chain branching

Family

Application60/274,789Us provisional application · filed 9 Mar 2001

Application09/927,908Parent of this division · filed 9 Aug 2001

US 2003/0166782 A1Pre-grant publication · published 4 Sep 2003

US 6,545,094 B2Parent of this division

US 2003/0032731 A1Published application

US 6,723,793 B2This patent

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

Blends of ethylenic polymers with improved modulus and melt strength and articles fabricated from these blends

Life of this patent

Blends of ethylenic polymers with improved modulus and melt strength and articles fabricated from these blends

Life of this patent

Abstract

Claims5