Sintef

Dynal Biotech Asa

Sinvent As

Life Technologies As

Invitrogen Dynal As

Nyfotek A/s

Norskhydro Asa

Invitrogen Corporation

Arvid Trygve Berge

John Ugelstad

Geir Fonnum

Elin Marie Aksnes

Lars Kilaas

Ruth Schmid

Tom-Nils Nilsen

Turid Ellingsen

Steinar Pedersen

Per Martin Stenstad

Ellen Weng

Rolf Nordal

Kari-Anne Leth-Olsen

Finn Hansen

Oddvar Aune

Solveig Staale

Jon Olav Bjorgum

Nini Kjus Hofsløkken

Henning Pettersen

Astrid Evenroed Molteberg

Anne Dalager Dyrli

Silje Nordbø

Arne Jørgedal

John Ugelstad Deceased

Tollef Taarneby

Oskar B Helgee

John Bjørgum

Grete Irene Modahl

B&aring;rd S&aelig;thre

Harald Jacobsen

Astrid Evenrød Molteberg

Jon-Olav Bjo Slashedrgum

Astrid Evenrod Molteberg

Silje Nordbo

Viola Ugelstad, Legal Representative

John Ugelstad, Deceased

Arvid Tryge Berge, Legal Representative

Turid Ellingsen, Deceased

John Bjorgum

Arne Jorgedal

Tollef Tårneby

Finn Knut Hansen

Solveig Marie Staale

Nini Kjus Hofsloekken

Jon Olav Bjoergum

Silje Steinbakk Nordbo

Jon Olav Bjørgum

A process for the preparation of monodisperse polymer particles which are formed by contacting monomers with aqueous dispersions comprising monodisperse swellable seed polymers/oligomers, and initiating polymerization in the presence of a steric stabilizer. The resulting swollen seed particles are characterized by the particle mode diameter.

Process for the preparation of monodisperse polymer particles

A process for the preparation of coated polymer particles containing superparamagnetic crystals, said process comprising reacting surface-functionalized, superparamagnetic crystal-containing polymer particles of diameter less than 0.5 &#x3bc;m with at least one polyisocyanate and at least one diol.

Process for preparation of coated polymer particles containing superparamagnetic crystals

A process for the preparation of coated polymer particles containing superparamagnetic crystals, said process comprising reacting porous, surface-functionalized, superparamagnetic crystal-containing polymer particles of diameter 0.5 to 1.8 &#x3bc;m with at least one polyisocyanate and at least one diol or at least one epoxide.

Process for the preparation of coated polymer particles

Process

The invention provides electroconductive particles comprising a styrene copolymer core and an external gold coating, characterised in that as said copolymer core is used a styrene copolymer comprising less than 50 wt. % styrene residues.

Particles

A procedure for the production of PVC particles with a narrow size distribution in the range 10-50 &mgr;m, preferably 10-30 &mgr;m, in which, in a first stage, a vinyl monomer or a mixture of monomers is polymerised to form a polymer/oligomer seed particle in the range 1-10 &mgr;m. In a second stage, another vinyl monomer or mixture of monomers is swelled into the polymer/oligomer seed particles and polymerisation takes place in such a way that they grow into polymer particles of the desired size. It is preferable to use aromatic vinyl monomers or acrylates as the monomer in the seed particles. The seed particles in the first stage can be produced in a two-stage swelling process or by dispersion polymerisation.

Two-stage seed swelling procedure for producing monodisperse PVC particles

Process for preparing an aqueous emulsion with narrow droplet size

Immobilization and separation of cells and other particles

Process for preparing a dispersion and for preparing polymer particles

Magnetic polymer particles prepared by treating compact or porous polymer particles with a solution of iron salts and, if desired, salts of other metals which are capable of forming magnetic ferrites, in which the solution swells or penetrates into the particles. Iron hydroxide and possible other metal hydroxides are precipitated, for instance by raising the pH value, and the particles are optionally heated. In the iron salts used the ratio between di- and trivalent iron is suitably such that magnetic iron oxide is formed directly. It is also possible to use oxidizing or reducing groups or additives to obtain such a ratio. When other metal salts are used in addition to iron salts, the operation is carried out in the same manner. For instance, when Mn.sup.++, Co.sup.++ or Ni.sup.++ salts are used in addition to Fe.sup.++ salts, the divalent iron is oxidized to trivalent so that magnetic ferrite is obtained. The polymer particles which are treated with metal salts preferably contain metal-binding groups. Such groups are incorporated for instance by using monomers which contain said groups for the preparation of the polymer particles, or the groups are incorporated in the polymer particles prepared. The magnetic polymer particles are spherical and have a uniform concentration of magnetic material. They may be used for medical, diagnostic or other purposes.

Process for preparing magnetic polymer particles

Magnetic polymer particles and process for the preparation thereof

Growing community of inventors

Trandheim, Norway

Arvid Trygve Berge