| 摘要 |
A process for preparing a dispersion of encapsulated solid particles in a liquid medium comprising: i) comminuting a composition comprising a solid, a liquid medium and a polyurethane dispersant having an acid value of from 0.55 to 3.5 mmoles per g of dispersant, said composition comprising from 5 to 40 parts of polyurethane dispersant per 100 parts of solid, the parts being by weight; and ii) cross-linking the polyurethane dispersant in the presence of the solid and the liquid medium so as to encapsulate the solid particles; wherein the polyurethane dispersant contains less than 10% by weight of repeat units from polymeric alcohols, each polymeric alcohol having a number averaged molecular weight of more than 500 daltons. |
