Patent ID: 7981950

Claim:
A process for preparing an encapsulated particulate solid comprising cross-linking a dispersant with a cross-linking agent in the presence of a particulate solid and a liquid medium, thereby encapsulating the particulate solid within the cross-linked dispersant characterised in that: a) the dispersant has at least one cross-linkable group selected from keto, aldehyde and beta-diketoester groups, b) the cross-linking agent has at least two groups reactive towards said cross-linkable groups; wherein the cross-linking reaction is performed by mixing the following ingredients: i) the liquid medium; ii) the particulate solid in a weight ratio of 1:100 to 1:3; iii) the dispersant in a weight ratio of 1:100 to 1:3.3; and iv) the cross-linking agent in a weight ratio of 1:10000 to 1:10; wherein all weight ratios are relative to the weight of the liquid medium.