Polymer coated powders

B - Operations – Transporting – 01 – J

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B01J 2/30 (2006.01) C05G 3/10 (2006.01) C09C 3/10 (2006.01)

Patent

CA 2230892

A process for coating a solid with a water-insoluble or slightly water-soluble coating material consisting essentially of a high-viscosity polymer and/or wax and/or grease, or mixtures thereof, comprises dissolving the said coating material in one or more materials selected from among carboxylic acids, carboxylic acid anhydrides, carboxylic acid halides and/or mixtures thereof, to form a low-viscosity "polymer solution", contacting the solid to be coated with the said "polymer solution", and chemically or physically modifying the "polymer solution" to cause the formation of a coating of increased viscosity.

Cette invention concerne un procédé permettant d'enrober un solide d'une matière de revêtement, insoluble dans l'eau ou légèrement soluble dans l'eau, constituée principalement d'un polymère et/ou de cire et/ou de graisse à viscosité élevée, ou de mélanges de ceux-ci. Ledit procédé consiste à dissoudre la matière de revêtement dans une ou plusieurs matières sélectionnées parmi des acides carboxyliques, des anhydrides d'acides carboxyliques, des halogénures d'acides carboxyliques et/ou des mélanges de ceux-ci, de manière à former une "solution polymère" à faible viscosité, puis à mettre en contact ledit solide à enrober avec ladite "solution polymère" et enfin à modifier chimiquement ou physiquement la "solution polymère" de façon à provoquer la formation d'un revêtement à viscosité accrue.

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