| 摘要 |
There are provided internally cross-linked, stable polymeric materials, in t he form of substantially spherical particles, each particle consisting essentially of a single macromolecule. They have the unusual property of bei ng soluble or dispersible in a liquid medium without significantly increasing t he viscosity of the medium, rendering them potentially useful in imaging applications such as ink jet printers. They can be prepared by dissolving polymeric material in a solvent system to form a solution of the polymeric material at a concentration therein of less than the critical concentration for the polymer, causing the polymeric material to contract into an approximately spheroidal conformation in solution, cross-linking the polymer ic material in solution in said spheroidal conformation so assumed, and recovering stable, cross-linked approximately spheroidal polymeric particles from the solution.
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