Shell Oil Comapny

Technical Development Associates

Other

Cary Alan Veith

James R Erickson

Robert Lawrence Blackbourn

Robert Q Kluttz

Thomas C Forschner

Craig A Stevens

Michael Wayne Potter

James Laurel Buechele

David Eric Gwyn

William Charles Malven

Bhaskar P Rao

David Shawn Cushing

An asphalt blend is presented in which asphalt is blended with a phenolic tar. The phenolic tar is primarily cumyl phenol and phenolic materials having a molecular weight of between about 300 and 1000. The tar is obtained as the bottoms product of a phenol heavy ends separation process and may also include phenol and acetophenone. A process for preparing this blend is also presented.

Phenolic asphalt blends

Protected functional initiator initiated elastomer solutions are deprotected and optionally ionic impurities removed by contact with a molten component such as sodium bisulphate monohydrate. This allows deprotection and removal of metal contaminants such as the initiator or residue from hydrogenation catalysts without the introduction of significant amounts of additional water which cause emulsion formation. In accordance with this invention, better metal removal is achieved and the process of metal removal operates more smoothly because of the absence of emulsion formation. Separation of the molten component containing the extracted metal contaminants can easily be carried out by simple liquid-liquid phase separation on either a continuous or batch basis.

Deprotection with molten salt

Poly-p-dioxanone is prepared in a process comprising:

Method for preparing poly-p-dioxanone polymer

A process for the concurrent epoxidation of, and catalyst residue extraction from, anionically polymerized diene-containing polymers which have been hydrogenated using a Group VIII metal catalyst, said process comprising:

Concurrent epoxidation and catalyst residue extraction

A class of catalysts for the anionic copolymerization of cyclic lactams in the presence of .omega.-(N-acyllactam)polyorganosiloxanes, .alpha.,.omega.-di-(N-acyllactam)polyorganosiloxanes or star-shaped .omega.-(N-acyllactam)polyorganosiloxanes is disclosed. The catalysts successfully protect the siloxane prepolymer from harmful depolymerization reactions at elevated temperatures while anionically polymerizing the cyclic lactams via ring-opening. Diblock, triblock, multiblock and star-block copolymers, e.g., of a polyorganosiloxane and a polyamide, with advantageously high polyorganosiloxane and polyamide block molecular weights and superior heat resistance can be synthesized with the catalysts. The composition of these block copolymers, with the structure AB, ABA, and star-(BA).sub.r, r .gtoreq.3, where A=polyamide and B=polyorganosiloxane, and the process for producing them are also described.

Polyorganosiloxane-polyamide block copolymers

A class of catalysts for the anionic copolymerization of cyclic lactams in the presence of .omega.-(N-acyllactam)polyorganosiloxanes, .alpha.,.omega.-di-(N-acyllactam)polyorganosiloxanes or star-shaped .omega.-(N-acyllactam)polyorganosiloxanes is disclosed. The catalysts successfully protect the siloxane prepolymer from harmful depolymerization reactions at elevated temperatures while anionically polymerizing the cyclic lactams via ringopening. Diblock, triblock, multiblock and star-block copolymers, e.g., of a polyorganosiloxane and a polyamide, with advantageously high polyorganosiloxane and polyamide block molecular weights and superior heat resistance can be synthesized with the catalysts. The composition of these block copolymers, with the structure AB, ABA, and star-(BA).sub.r, r .gtoreq.3, where A=polyamide and B=polyorganosiloxane, and the process for producing them are also described.

Growing community of inventors

Houston, TX, United States of America

Cary Alan Veith