The Dow Chemical Company

Other

Dow Global Technolgoies LLC

Virginia Tech Intellectual Properties Inc

Center for Innovative Technology

Virginia Polytechnic Institute and State University

Dow Deutschland Inc.

Snap Block Corp.

Duane B Priddy, Sr

Mehmet Demirors

William C Pike

Virginia A Dais

James M Roe

Jose M Rego

Irene Q Li

Robert A Koster

Michael Pirc

Kevin D Sikkema

James J O'Brien

Kyung W Suh

Ray E Drumright

James E McGrath

Eugene R Moore

William Gerald Stobby

Chau Van Vo

H James Harwood

Andrew N Paquet

Jerry L Hahnfeld

Steven R Mitchell

Carrington Duane Smith

Robert H Terbrueggen

Edmund J Stark

Brian R Maurer

Sheila M Tinetti

Albert J Heuvelsland

Van I Stuart

Nicolaas M Hermans

Peter Hendrikus Vollenberg

John R Schroeder

Rudi H Veraart

Robert Kitchen

Alan Letton

Ludo Aerts

Eric J Shero

Timothy Pickering

This invention is a process to manufacture high quality vinyl aromatic polymer that is essentially free of unreacted vinyl aromatic monomer using retarded anionic polymerization wherein the retardant is insoluble and can be removed from the polymerization at an intermediate stage so that the polymerization can be carried to completion in the absence of the retardant.

Retarded anionic polymerization of vinyl aromatic monomers using insoluble or heterogeneous retardants

A kit for forming a hollow block assembly to be used to construct a wall, the kit consisting of two face panels and a plurality of fasteners, each face panel comprising a plurality of spaced apart flanges extending perpendicularly from and attached to each panel so that a hollow block structure is assembled when the flanges of the face panels are connected together, directly or indirectly, by the fasteners.

Wall construction

The present invention relates to a polymer produced by polymerizing a vinyl aromatic monomer in the presence of a small amount of furfuryl (alkyl)acrylate.

High molecular weight monovinylidene aromatic polymers with good processability

Disclosed are cyclic phosphate esters of fumarate- or maleic acids suitable for use as a comonomer, capable of being copolymerized with a monovinylidene aromatic compounds to impart flame resistant properties to the resultant copolymers.

Phosphorous-containing monomers and flame retardant high impact monovinylidene aromatic polymer compositions derived therefrom

The present invention is an improved process for producing high molecular weight monovinylidene aromatic polymers and polymodal compositions by free radical polymerization of a vinyl aromatic monomer in the presence of a vinyl acid, wherein the improvement comprises neutralizing the acid after production of the desired amount of high molecular weight monovinylidene aromatic polymer by adding a base.

Process for producing high molecular weight monovinylidene aromatic polymers and polymodal compositions

Production of branched polymers

The present invention is a process for producing a high molecular weight monovinylidene aromatic polymer, comprising free radically polymerizing a vinyl aromatic monomer in the presence of less than 10 ppm of a vinyl acid having a pKa at 25.degree. C. of less than 2.0.

Catalyzed process for producing high molecular weight monovinylidene

The present invention is a free radical bulk polymerization process for the preparation of high molecular weight polymers from vinyl aromatic monomers, characterized in that the polymerization is conducted in the presence of a vinyl acid containing either a sulfur or phosphorus atom within the acid functional group.

High molecular weight polysytrene production by vinyl acid catalyzed

High molecular weight polystyrene production by vinyl acid catalyzed

The present invention is directed to rubber modified polymers which contain a non-block grafted rubber having a degree of grafting of at least 30 percent at the point of phase inversion and a specified amount of grafted vinyl aromatic polymer.

Polymers containing highly grafted rubbers

The present invention is an improvement in a free radical bulk polymerization process for preparing a high molecular weight polymer from a vinyl aromatic monomer characterized in that the polymerization is conducted in the presence of an acid catalyst having a pKa at 25.degree. C. of less than 2, or salt thereof, wherein the improvement comprises dispersing the acid catalyst, or salt thereof, in a (meth)acrylic acid or ester thereof, prior to contact with the vinyl aromatic monomer. The (meth)acrylic acid or ester allows the acid catalyst to be dispersed within the vinyl aromatic monomer without causing cationic polymerization. The acid catalyst, or salt thereof, catalyzes the free radical polymerization reaction such that high molecular weight polymers are produced in reasonable reaction times.

Acid catalyzed polymerization

The present invention is a free radical bulk polymerization process for producing a rubber modified polymer from a vinyl aromatic monomer comprising:

In situ block copolymer formation during polymerization of a vinyl

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 free radical polymerization process for producing a branched polymer from a vinyl aromatic monomer comprising polymerizing a vinyl aromatic monomer in the presence of a free radical initiator of the formula: ##STR1## wherein R is H, alkyl, or aralkyl, and R' is alkyl or aryl.

Process for preparing a branched polymer from a vinyl aromatic monomer

Disclosed is an extruded, linear, bimodal monovinyl aromatic polymer foam having a weight average molecular weight of from about 100,000 to about 200,000, greater than 5 percent by weight of its polymer chains having a weight average molecular weight of 500,000 to 1,000,000, and less than 5 percent by weight of its polymer chains having a weight average molecular weight of greater than 1,000,000. Use of the polymer enables process pressure drop to be significantly reduced and allows the formation of a foam of lower density and larger cross-section. Further disclosed is a process for making the extruded foam.

Extruded foams having a monovinyl aromatic polymer with a broad

Growing community of inventors

Midland, MI, United States of America

Duane B Priddy, Sr