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AssigneeMitsubishi Chemical Corporation
InventorsKiyoji Takagi, Koji Nishida, Megumi Kojima
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In a process for producing an amorphous thermoplastic resin composition comprising melt-kneading at least one amorphous thermoplastic resin, an improvement comprising melt-kneading the amorphous thermoplastic resin in the presence of not less than 1% by weight, based on the amorphous thermoplastic resin, of an organic solvent in a kneader having a vent hole(s) while maintaining at least one vent hole of the kneader under reduced pressure by means of an evacuator to remove the organic solvent so as to reduce the organic solvent content in the final composition to less than 1% by weight. Thermal deterioration of the resin during melt-kneading can be inhibited to provide a resin composition having well-balanced impact resistance and heat resistance and excellent hue.
A process for producing an amorphous thermoplastic resin composition comprising melt-kneading at least two amorphous resins which are selected from the group consisting of only amorphous resins and wherein said two amorphous resins are different from each other, in which said melt-kneading is conducted in the presence of not less than 1% by weight, based on the amorphous thermoplastic resin, of an organic solvent in a kneader having a vent hole(s) while maintaining at least one vent hole of the kneader under reduced pressure by means of an evacuator to remove the organic solvent so as to reduce the organic solvent content in the final composition to less than 1% by weight, wherein said organic solvent is added in an amount of from 2 to 30% by weight based on the amorphous resin and wherein said at least two amorphous resins have a glass transition point of not lower than 50.degree. C. and a heat of fusion of less than 1 cal/g.
Dependencies are inferred from the claim text.