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 .mu.m with at least one polyisocyanate and at least one diol or at least one epoxide.

 
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> Method to improve high temperature cohesive strength with adhesive having multi-phase system

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