| 摘要 |
<p>This invention relates to a novel product, fibrils of cross- linked polyester resin having a vesiculated structure, and to a process of making them.</p><p>Vesiculated fibrils of crosslinked polyester resin of length 50µm - 5 cm, diameter 1 µm - 2mm and aspect ratio of 10-50 are prepared by pouring into water with stirring a selected solution in unsaturated monomer of a carboxylated unsaturated polyester resin of acid value 10-90 mg KOH per g., the water containing both a base having a pK<Sub>b</Sub> value of 8 maximum and a dispersion stabiliser, and initiating polymerise- tion. The polyester solution is selected for suitability for fibril formation by means of a buoyancy test.</p><p>The fibrils are useful in a number of applications, for example, as fillers for paints and putties, viscosity modifiers in liquids and replacements in some applications for fibrous mineral extenders such as asbestos.</p> |
