The Dow Chemical Company

Robert A Koster

Duane B Priddy, Sr

Irene Q Li

Ray E Drumright

Robert H Terbrueggen

Philip J Brondsema

William C Sumner

Tom D Traugott

Willis J Pennington

Susan E Vilmer

A living free-radical polymerization process for preparing polymers from vinyl aromatic monomers comprising polymerizing the vinyl aromatic monomer in the presence of a difunctional nitroxyl initiator.

Difunctional living free radical polymerization initiators

A process of polymerizing a monomer capable of undergoing free radical polymerization, comprising contacting the monomer with a diradical initiator at a temperature sufficient to initiate free radical polymerization, wherein said diradical initiator contains sites of C--C unsaturation which cyclize to form a diradical.

Free radical polymerization

Ortho-aromatic diaryl ethers, such as o-biphenylyl phenyl ether, are hydrolyzed to corresponding phenolic compounds, such as o-phenylphenol and phenol, when contacted with water in the presence of ceria or thoria at a temperature of between about 250.degree. C. and 700.degree. C.

Process for hydrolysis of ortho-aromatic di-aryl ethers

Impact-resistant transparent polymeric compositions are prepared comprising particulate diene-monovinylidene aromatic block copolymer elastomer dispersed in a matrix comprising polymerized monovinylidene aromatic and acrylate monomers. These compositions can be advantageously prepared by adding the elastomeric block copolymer to an agitated polymerization system at a point where the elastomer will become dispersed as particles immediately or nearly immediately after addition.

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Midland, MI, United States of America

Robert A Koster