Method for preparing resin composition for expandable polypropylene carbonate and expandable polypropylene carbonate prepared therefrom

A method for preparing a resin composition for an expandable polypropylene carbonate, the method comprising:

• 1) providing components consisting of polypropylene carbonate resin (a1), a thermoplastic resin (a2), a compatibilizer (B), a cross-linking agent, a chain extender, or a mixture thereof (C), an inorganic material (D), and a heat stabilizer (E);
• 2) cross-linking the polypropylene carbonate resin (a1), the thermoplastic resin (a2), and the cross-linking agent, the chain extender, or the mixture thereof (C) provided in step 1);
• and
• 3) mixing the obtained material in step 1), step 2) and the compatibilizer (B), the inorganic material (D), and the heat stabilizer (E) provided in step 1) with one another,
• wherein the compatibilizer (B) compatibilizes between the polypropylene carbonate resin (a1) and the thermoplastic resin (a2).