Phillips Petroleum Company

Chevron Phillips Chemical Company LP

George A Moczygemba

Nathan E Stacy

William J Trepka

Ralph C Farrar, Jr

Craig Donald DePorter

Larry L Nash

Ralph C Farrar

Nancy R Knight

Henry L Hsieh

Iqbal Ahmed

Jianxin Kuang

Craig D Deporter

M Bruce Welch

Syriac J Palackal

Earl Clark, Jr

Richard Peacock

Charles M Selman

W Delmar Johnson

Floyd E Naylor

Howard B Irvin

Carleton E Stouffer

Aubrey South, Jr

Kishore Udipi

Daniel T Fernald

Vergil H Rhodes

Mark J Dreiling

Stephen L Ege

Gregory M Swisher

John R Bohannan

Ronnie L Lewis

Si M Nguyen

Frankie K Wood-Black

Luis E Reyes

Tad L Olson

This invention relates to polymer blends, which comprise at least one tapered conjugated diene-monovinylarene block copolymer and at least one styrenic polymer. The polymer blends possess good optical and mechanical properties.

Conjugated diene/monovinylarene block copolymers blends

A block copolymer comprising at least three consecutive conjugated diene/monovinylarene tapered blocks is provided. Other aspects of this invention include a polymerization process for preparing the block copolymer and polymer blends comprising the block copolymer. The block copolymer and polymer blends exhibit excellent optical and mechanical properties.

Conjugated diene/monovinylarene block copolymers, methods for preparing same, and polymer blends

A method for preparing tapered block copolymers which are particularly useful for blend components in blends with polymers of styrene. In the first embodiment of this invention the copolymers are prepared in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomers in the presence of a randomizer; (2) an initiator and monovinylaromatic monomers; (3) a mixture of monovinylaromatic and conjugated diene monomers; and (4) a coupling agent; to produce a polymodal tapered block copolymer. In a second embodiment of the invention tapered block copolymers are prepared in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomers in the presence of a randomizer; (2) an initiator and monovinylaromatic monomers; (3) a mixture of monovinylaromatic and conjugated diene monomers; (4) a mixture of monovinylaromatic and conjugated diene monomers; and (5) a coupling agent; to produce a polymodal tapered block copolymer. The invention copolymers and blends of the invention copolymers with polymers of styrene are particularly useful for applications such as packaging and food or drink containers which require transparency, low blueness, colorlessness, good impact strength and ductility.

Tapered block copolymers of monovinylarenes and conjugated dienes

A process to produce a monovinylaromatic polymer is provided. Said monovinylaromatic polymer is provided.

Process to make a monovinylaromatic polymer and said monovinylaromatic polymer

A process to produce a monovinylaromatic/monoolefin polymer is provided. Said monovinylaromatic/monoolefin polymer is provided.

Process to produce a monovinylaromatic/ monoolefin polymer and said monovinylaromatic/monoolefin polymer

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

Process to produce coupled block copolymers and said copolymers

Conjugated diene/monovinylarene block copolymers, methods for preparing

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

Tapered block copolymers of monivinylarenes and conjugated dienes

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 method for preparing blends of a copolymer in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomer in the presence of a randomizer; (2) an initiator and monovinylaromatic monomer; (3) a mixture of monovinylaromatic and conjugated diene monomers; (4) a mixture of monovinylaromatic and conjuated diene monomers; (5) conjugated diene monomer; and (6) a coupling agent; and the polymodal tapered block copolymers prepared thereby. The copolymers are particularly useful neat or in blends for applications such as packaging and food or drink containers which require transparency and good environmental stress crack resistance.

Blends of copolymers of monovinylarenes and conjugated dienes containing

A method for preparing tapered block copolymers which are particularly useful for blend components in blends with polymers of styrene. In the first embodiment of this invention the copolymers are prepared in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomers in the presence of a randomizer; (2) an initiator and monovinylaromatic monomers; (3) a mixture of monovinylaromatic and conjugated diene monomers; and (4) a coupling agent; to produce a polymodal tapered block copolymer. In a second embodiment of the Invention tapered block copolymers are prepared in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomers in the presence of a randomizer; (2) an initiator and monovinylaromatic monomers; (3) a mixture of monovinylaromatic and conjugated diene monomers; (4) a mixture of monovinylaromatic and conjugated diene monomers; and (5) a coupling agent; to produce a polymodal tapered block copolymer. The invention copolymers and blends of the invention copolymers with polymers of styrene are particularly useful for applications such as packaging and food or drink containers which require transparency, low blueness, colorlessness, good impact strength and ductility.

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Bartlesville, OK, United States of America

George A Moczygemba