Processes of controlling molecular weight distribution in ethylene/α-olefin compositions

Patent metadata

Field	Value
Publication number	US-8969495-B2
Application number	US-201313744689-A
Country	US
Kind code	B2
Filing date	Jan 18, 2013
Priority date	Dec 9, 2005
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

The present invention relates to compositions and processes of making ethylene/α-olefins. More particularly, the invention relates to processes of producing ethylene/α-olefin compositions having a controlled molecular weight distribution. The molecular weight distribution is controlled, for example, by controlling the relative monomer concentrations during contact with a pre-catalyst and/or using a catalyst comprising a catalytic amount of a molecule having the structure:

wherein M=group 2-8 metal, preferably group 4 as a neutral or charged moiety;
Y=any substituent including fused rings;
L=any ligating group, especially a pyridyl or pyridylamide;
X=alkyl, aryl, substituted alkyl, H or hydride, halide, or other anionic moiety;
y=an integer from 0 to the complete valence of M;
R=alkyl, aryl, haloalkyl, haloaryl, hydrogen, etc;
x=1-6, especially 2;
Dashed line=optional bond, especially a weak bond; and
X and (CR 2 ) x may be tethered or part of a ring.

First claim

What is claimed is:

1. A composition comprising:
an ethylene/α-olefin interpolymer composition with a multi-modal molecular weight distribution and one or more molecules having a gram molecular weight equal to about ((the molecular weight of an aryl or hydrocarbyl-ligand of a pre-catalyst)+28+14*X), wherein X represents an integer from zero to 10, and
the ethylene/α-olefin interpolymer is formed from a single catalyst under continuous polymerization conditions and the ethylene/α…

Assignees

• Dow Global Technologies Llc

Inventors

• Hustad Phillip D
• Kuhlman Roger L
• Froese Robert D J
• Wenzel Timothy T
• Coalter Iii Joseph N

Classifications

• C08F4/64079

  Chemistry & Metallurgy · mapped topic

• C08F210/14

  Chemistry & Metallurgy · mapped topic

• C08F4/64144

  Chemistry & Metallurgy · mapped topic

• C08F2500/04

  Chemistry & Metallurgy · mapped topic

• C08F210/16 Primary

  Chemistry & Metallurgy · mapped topic