Thermoplastic Resin Having Excellent Heat Resistance and Impact Strength and Method of Preparing the Same

A method of preparing a thermoplastic resin composition that can have excellent heat resist and impact strength comprising:

• continuously feeding a first feed stream including a first reactant comprising a conjugated diene rubber, an aromatic rubbery copolymer, a heat resistant aromatic vinyl compound, an aromatic vinyl compound, a multi-functional vinyl compound and an initiator and a second feed stream that is different from the first feed stream including a second reactant comprising an unsaturated nitrile compound, a N-substituted maleimide compound and an aromatic vinyl compound to a reactor that is part of a plurality of reactors linked in series;
• and
• thereafter polymerizing the first reactant and the second reactant to prepare a polymer.

The method of 16, wherein the temperature of each of said reactors is maintained at about 90 to about 150° C.

The method of 16, wherein the plurality of reactors includes a final polymerization reactor, and wherein the final polymerization reactor is maintained at a temperature of about 110 to about 140° C.

The method of 16, further comprising delivering a polymer from the final polymerization reactor to a devolatizer apparatus and removing volatile components of the polymer.

The method of 19, wherein the polymer delivered from the final polymerization reactor to the devolatizer at a temperature of about 140 to about 160° C.

The method of 19, wherein said devolatizer apparatus is operated under the conditions of a temperature of about 230 to about 260° C. and a pressure of about 100 torr or less.

The method of 16, wherein the number of the plurality of reactors is about 2 to about 5.

The method of 16, wherein the first reactant and the second reactant are fed into the same reactor and polymerized.

The method of 16, wherein the first reactant is fed into a first reactor and polymerization thereof is initiated in the first reactor to form a polymer, the second reactant is fed into a downstream reactor, the polymer from the first reactor is directed into the downstream reactor, and the second reactant participates in additional polymerization of the polymer in the downstream reactor.

The method of 16, wherein said first reactant further comprises an organic solvent.