US 8,415,442 B2 · High pressure low density polyethylene resins with improved optical properties produced through use of highly active chain transfer agents

Abstract

Disclosed is an ethylene-based polymer with a density from about 0.90 to about 0.94 in grams per cubic centimeter, with a molecular weight distribution (Mw/Mn) from about 2 to about 30, a melt index (I2) from about 0.1 to about 50 grams per 10 minutes, and further comprising sulfur from about 5 to about 4000 parts per million. The amount of sulfur is also determined based upon the total weight of the ethylene-based polymer. Also disclosed is process for making an ethylene-based polymer which includes the steps of splitting a process fluid for delivery into a tubular reactor; feeding an upstream process feed stream into a first reaction zone and at least one downstream process feed stream into at least one other reaction zone, where the process fluid has an average velocity of at least 10 meters per second; and initiating a free-radical polymerization reaction.

Claims7

Dependent claims

An ethylene-based polymer with a density from about 0.90 to about 0.94 in grams per cubic centimeter, a molecular weight distribution (Mw/Mn,) from about 2 to about 30, a melt index (I2) from about 0.1 to about 50 grams per 10 minutes, and further comprising from about 5 to about 4000 parts per million by weight of sulfur as determined using a Total Sulfur Concentration method and based upon the total weight of the ethylene-based polymer, and

wherein the ethylene-based polymer is formed from a reaction mixture comprising a “sulfur containing compound” containing a -S- functional group, in addition to carbon atoms substituted with hydrogen atoms, and where a portion of the hydrogen atoms may optionally be substituted by inert substituents or moieties.

Dependencies are inferred from the claim text.

Facts

Application

13/063,960Filed 1 Oct 2009 · us provisional application

Priority

7 Oct 2008

Published

US 2011/0178253 A121 Jul 2011

Granted

9 Apr 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

C08F 10/02
Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond: ethene
C08F 110/02
Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond: ethene
Y10S 526/917
Synthetic resins or natural rubbers -- part of the class 520 series: manipulative processes involving a sulfur-containing treating agent
C08F
Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds

High pressure low density polyethylene resins with improved optical properties produced through use of highly active chain transfer agents

Life of this patent

High pressure low density polyethylene resins with improved optical properties produced through use of highly active chain transfer agents

Life of this patent

Abstract

Claims7