Phillips Petroleum Company

Chevron Phillips Chemical Company LP

Larry L Nash

George A Moczygemba

Nathan E Stacy

William J Trepka

Ralph C Farrar, Jr

Craig Donald DePorter

Richard Peacock

Charles M Selman

John D Hottovy

Iqbal Ahmed

Carleton E Stouffer

Daniel T Fernald

Jianxin Kuang

Stephen L Ege

John R Bohannan

Luis E Reyes

Tad L Olson

Si M Nguyen

Ralph C Farrar

Craig D Deporter

We disclose a monovinylarene/conjugated diene block copolymer, comprising: (i) a random (conjugated diene/monovinylarene)block, wherein x is about 2.5 wt % to about 10 wt %, y is from about 90 wt % to about 97.5 wt %, and x+y is about 97.5 wt % to 100 wt %; and (ii) a (conjugated diene)block; wherein n is from about 20 wt % to about 30 wt %, m is from about 70 wt % to about 80 wt %, and m+n is from about 90 wt % to 100 wt %. We also disclose a method of forming the block copolymer and a method for fabricating an article from the block copolymer. The block copolymer typically exhibits a Tat least about 10&#xb0; C. less than the Tof a reference polymer differing only in that x is about 0 wt % and y is about 100 wt %.

Monovinylarene/conjugated diene copolymers having lower glass transition temperatures

This invention provides a process to produce coupled block copolymers and said coupled block copolymers.

Process to produce coupled block copolymers and said copolymers

A system and process for purifying a 1,3-butadiene feedstock containing 1,3-butadiene and various impurities by first introducing the 1,3-butadiene feedstock stream to a separation column to produce an intermediate product stream containing 1,3-butadiene and residual impurities and then introducing the produced intermediate product stream through a condenser to a suitable dryer for removing residual impurities from the intermediate product stream and thereby forming a purified 1,3-butadiene stream. The separation column separates an overhead stream, containing 1,3-butadiene and impurities such as propadiene, water and oxygen, and a bottoms stream, containing impurities such as polymerization inhibitor, ethyl acetylene, 1,3-butadiene dimer, pentane and 1,2-butadiene, from the intermediate product stream which leaves the separation column in the form of a vapor side draw stream.

Purification of 1,3-butadiene

This invention provides a process to produce a composition that comprises diluent and copolymer and also provides the composition. The process of this invention comprises: (a) producing a composition that comprises diluent and copolymer; and (b) removing a portion of said diluent from said composition. This produces a composition that has a lower amount of diluent and a lower amount of imperfections.

Copolymer production, product thereof and diluent removal therefrom

A method for preparing resinous polymodal monovinylarene-conjugated diene block copolymers and polymers produced thereby are provided. The method comprises sequentially contacting under polymerization conditions:

Block copolymers of monovinylarenes and conjugated dienes and

A process for stabilizing polymers is provided comprising:

Method for stabilizing monovinylarene/conjugated diene copolymers and a

A process for recovering a rubbery polymer from a rubber-in-solvent solution by steam-stripping the solution to produce rubber crumb in aqueous phase using a low molecular weight lactone copolymer as stripping aid.

Lactone copolymers as stripping aids in recovery of polymer from solution

A monovinyl arene, such as styrene, is polymerized with a monofunctional lithium initiator, followed by addition of a conjugated diene, such as butadiene, with additional monofunctional lithium initiator. The resultant block copolymers are coupled to give linear coupled block copolymers or radial coupled block copolymers with a random distribution of homopolymer and copolymer branches. The polymers exhibit increased tack and improved creep resistance in adhesive compositions. The amount of initiator added as the second increment with the second monomer must be greater than the amount added as the first increment with the first monomer.

Coupled block copolymers with improved tack for adhesives

Rubbery coupled conjugated diene/monovinyl-substituted aromatic hydrocarbon teleblock copolymers are prepared by incremental addition of both monovinyl-substituted aromatic hydrocarbon and initiator. The resulting copolymers can be used to produce improved pressure-sensitive adhesives.

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Bartlesville, OK, United States of America

Larry L Nash