POLYMERIC COMPOSITIONS AND METHODS OF MAKING AND USING THEM

摘要

Particulate water-soluble or water-swellable polymeric material is provided with a substantially uninterrupted continuous coating of crystalline material. Single particles or aggregates having a size below 1 mm in size can be made by mixing the polymeric particles with a substantially saturated or supersaturated aqueous solution of crystallisable material (optionally a melt of hydrate crystallisable material) and thereby depositing it as a continuous crystalline coating on the particles.