Process for producing low-dust transparent thermoplastic resin solution.

摘要

A transparent thermoplastic resin, e.g. polystyrene, is dissolved in a water-immiscible solvent, preferably of lower solubility than water, such as an aliphatic or aromatic hydrocarbon, the solution preferably having a viscosity of 10 to 3000 cps and concentration of 10 to 25 wt %; pure water of a low dust content may be mixed in amount of 1 to 200 wt %.
<??>The solution is centrifuged at 3000 G or more and allowed to stand to separate into an aqueous phase and a resin solution. The dust particles are mainly left on the interface on the aqueous side so that the resin solution is recovered containing less than 10,000 particles of dust of a size of at least 0.5 mu m per gram of solid resin.
<??>The centrifuging can be repeated if necessary. Conventional microfiltration can also be used.