Surface isocyanate groups process for providing solid particles with a coating having reactive
Abstract
Abstract SOLID PARTICLES ARE PROVIDED WITH A CROSS-LINKED POLYMERIC COATING HAVING A HIGH CONCENTRATION OF REACTIVE SURFACE ISOCYANATE GROUPS. AN ORGANIC POLYISOCYANATE WITH AN NCO FUNCTIONALITY OF AT LEAST 3 IS DISSOLVED IN AN APROTIC SOLVENT, INERT TO THE PARTICLES TO BE COATED AND THEN MIXED WITH A LIMITED AMOUNT OF WATER. THE PARTICLES TO BE COATED ARE CONTACTED WITH THE REACTION MIXTURE FORMED ABOVE UNTIL A CROSS-LINKED POLYMER IS ABSORBED OVER THE ENTIRE SURFACE OF THE PARTICLES. THE PARTICLES ARE THEN RECOVERED FROM THE REACTION MIXTURE AND STORED IN AN INERT ATMOSPHERE UNTIL FURTHER USE. A CATALYST MAY BE USED. THE SOLID PARTICLES COATED MAY BE ORGANIC, INORGANIC, POLYMERIC OR SILCEOUS. THE COATED PARTICLES ARE USEFUL AS FILLERS IN POLYMERIC SYSTEMS.
Inventors
- 👤 H Dehm
Bibliographic Details
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