Copolymer, Preparation Method Thereof, And Thermoplastic Resin Composition Including The Copolymer

Abstract: Provided in the present invention is an acryl-imide-based copolymer, which comprises: an alkyl (meth)acrylate-based monomer unit; an aromatic vinyl-based monomer unit; and an imide-based monomer unit, includes multiple copolymer chains, and has a glass transition temperature of 109? to 133?, wherein the imide-based monomer unit is contained in a content of 20 parts by weight or less relative to 100 parts by 100 parts by weight of the entire copolymer, and the content of residual monomers in the copolymer is 1.3 wt% or less. The copolymer has a small deviation in composition and a glass transition temperature that can be implemented to an appropriate level compared with the imide-based monomer, thereby ensuring excellent heat resistance and transparency.

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