Abstract: 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 ?m with at least one polyisocyanate and at least one diol.

Abstract: 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 ?m with at least one polyisocyanate and at least one diol or at least one epoxide.

Abstract: The invention provides a method for the treatment of a hydrocarbon well which method comprises administering, down said well, polymeric particles having covalently bound to a polymeric component thereof a well treatment chemical or a precursor thereof, wherein the particles contain covalent bonds scissile in an aqueous environment to release or expose said chemical or precursor.

Abstract: A process for the preparation of polymer magnetic particles, which comprises: providing polymer particles having a porous interior, and contacting the polymer particles with a magnetic fluid comprising a homogeneous dispersion of magnetic particles, whereby the magnetic particles are incorporated into the porous interior to produce polymer magnetic particles.

Abstract: A tracer system comprising a tracer compound for a fluid system, the tracer compound comprising one or more polyether alcohol compounds. The one or more polyether alcohol compounds is arranged for being placed in contact with a first part of said fluid system. The one or more polyether alcohol compounds is truly monodisperse. The polyether alcohol compounds comprises one or more functional groups. The one or more truly monodisperse polyether alcohol compounds is arranged for being detected in a second part of the fluid system in fluid communication with said first part of said fluid system. The tracer compound is detectable in very low concentrations.

Abstract: A process for the preparation of polymer magnetic particles, which comprises: (a) providing a water phase containing magnetic components homogeneously dispersed therein; (b) wherein the water phase is contacted with or further contains a polymerisable metal-containing or organic monomer which is soluble in the water phase; and (c) polymerizing the monomer in the presence of the magnetic in which the magnetic components are substantially uniformly distributed; wherein at least a part of the polymerizing step (c) is carried out in a water-in-oil emulsion in which the water phase containing the magnetic components homogeneously dispersed therein is present as a discontinuous phase in a continuous oil phase.

Abstract: 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 ?m with at least one polyisocyanate and at least one diol.

Abstract: Method and agent for reducing water production from oil and gas wells. The agent comprises polymer, cross-linked particles which are stable in water-free solvents. The particles are manufactured in an oil-in-oil emulsion and are cross-linked with at least one water-stable cross-liner and at least one water-labile cross-linker. The water-labile cross-linker is chosen so that when it is opened or broken in a reaction with water a hydrophilic seat is formed which increases the particle's ability to swell in water. The particles furthermore comprise a controlled amount of an immobilized chemical compound which by means of said reaction between water and reactive groups in the polymer skeleton, become able to form chemical bonds to another particle, to another reactive seat in the same particle or to another compounds thereby increasing the agent's stability in the formation.

Abstract: A process for the preparation of polymer magnetic particles, which comprises: providing a water phase containing magnetic components homogeneously dispersed therein, wherein the water phase is contacted with or further contains a polymerisable metal-containing or organic monomer which is soluble in the water phase, and polymerizing the monomer in the presence of the magnetic components so as to form polymer magnetic particles in which the magnetic components are substantially uniformly distributed; wherein at least a part of the polymerizing step is carried out in a water-in-oil emulsion in which the water phase containing the magnetic components homogenously dispersed therein is present as a discontinuous phase in a continuous oil phase.

Abstract: The invention provides a method for the treatment of a hydrocarbon well which method comprises administering, down said well, polymeric particles having covalently bound to a polymeric component thereof a well treatment chemical or a precursor thereof, wherein the particles contain covalent bonds scissile in an aqueous environment to release or expose said chemical or precursor.

Abstract: The invention provides a method for the treatment of a hydrocarbon well which method comprises administering, down said well, polymeric particles having covalently bound to a polymeric component thereof a well treatment chemical or a precursor thereof, wherein the particles contain covalent bonds scissile in an aqueous environment to release or expose said chemical or precursor.

Abstract: The invention provides a method for the treatment of a hydrocarbon well which method comprises administering, down the well, inverse suspension polymerized polymer particles having immobilized therein a well treatment chemical or a precursor or generator thereof.

Abstract: A method for the treatment of a hydrocarbon well comprising administering down the well polymeric particles impregnated with a well treatment chemical or precursor or generator thereof. The particles have a pore volume of at least 20%, and are prepared by a process which comprises preparing an aqueous dispersion of polymer particles containing from 0.05 to 10 times by volume, based on the polymer, of one or more specific first material(s) adding a partly water-soluble second material having a water-solubility of at least ten times that of first material(s) under conditions which prevent or hinder transport of first material(s) through the aqueous phase, whereby second material diffuses into the polymer particles swelled with first material(s) and increases the volume of said particles by from 20 to 1000 times, based on the polymer.

Abstract: 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 ?m with at least one polyisocyanate and at least one diol or at least one epoxide.

Abstract: 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 ?m with at least one polyisocyanate and at least one diol or at least one epoxide.

Abstract: 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 ?m with at least one polyisocyanate and at least one diol.

Abstract: Magnetic particles capable of binding a target substance, which comprise a magnetic material and a matrix material, wherein the magnetic material is remanent upon exposure to a magnetic field and the matrix material has a surface comprising functional groups which promote disaggregation of the particles in the presence of a liquid phase.

Abstract: 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 ?m with at least one polyisocyanate and at least one diol or at least one epoxide.

Abstract: 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 ?m with at least one polyisocyanate and at least one diol or at least one epoxide.

Abstract: 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 ?m with at least one polyisocyanate and at least one diol or at least one epoxide.