| http://www.w3.org/ns/prov#value | - Viewed from a second aspect, the present invention provides 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, e.g. 0.75 to 1.2 ??m, especially approximately 1 ??m, with at least one polyisocyanate, e.g. di
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