Patent ID: 6224794
Filing Date: 2001-05-01
Classification: B01J,C08J,Y10T

Abstract:
A process wherein microspheres are formed, comprising,passing a first fluid composition comprising a polymer and a solvent through an orifice and directly into a second fluid composition comprising water and a microsphere-stabilizing agent, under at least one of conditions (a) and (b), wherein(a) the first composition flows through a first conduit along a first path and exits the first conduit at the orifice, the second composition flows through a second conduit along a second path in an upstream to downstream direction, the first conduit is connected to the second conduit and terminates at the orifice, the first and second paths being orientated at an angle .theta. relative to each other, wherein 0.degree.<.theta.<180.degree.;(b) the first composition being at a first temperature and comprising a solvent having a boiling point, the second composition being at a second temperature, the boiling point of the solvent being less than or near to the second temperature; andforming a composition comprising water and microspheres, the microspheres comprising the polymer.