Method of preparing polyalkylene carbonate resin
First Claim
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1. A method of preparing a polyalkylene carbonate resin, the method comprising the sequential steps of:
- preparing a reaction mixture comprising polyalkylene carbonate, a catalyst residue, unreacted residual monomers, a chlorinated solvent, and alkylene carbonate-comprising by-products by polymerizing monomers comprising carbon dioxide and an epoxide compound in the presence of the catalyst and the chlorinated solvent;
recovering residual monomers from the reaction mixture;
removing the by-products from the reaction mixture, from which the residual monomers have been removed, by using 200 parts by weight to 1000 parts by weight of water with respect to 100 parts by weight of the monomers;
removing the catalyst residue from the reaction mixture, from which the residual monomers and the by-products have been removed, by using a filter having a pore size of less than 50 um; and
removing the chlorinated solvent from the reaction mixture, from which the residual monomers and the catalyst residue have been removed.
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Abstract
A method of preparing a polyalkylene carbonate resin is provided. More particularly, a method of preparing a polyalkylene carbonate resin capable of preventing polymer degradation and improving physical properties and quality of a final resin product, in which, after polymerization of polyalkylene carbonate, by-products are removed by using a large amount of water to purify a reaction mixture, and in a subsequence process of removing a catalyst residue, a primary purification method is conducted by using a filter so that a content of the catalyst in the reaction mixture is less than 1% by weight, is provided.
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Citations
12 Claims
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1. A method of preparing a polyalkylene carbonate resin, the method comprising the sequential steps of:
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preparing a reaction mixture comprising polyalkylene carbonate, a catalyst residue, unreacted residual monomers, a chlorinated solvent, and alkylene carbonate-comprising by-products by polymerizing monomers comprising carbon dioxide and an epoxide compound in the presence of the catalyst and the chlorinated solvent; recovering residual monomers from the reaction mixture; removing the by-products from the reaction mixture, from which the residual monomers have been removed, by using 200 parts by weight to 1000 parts by weight of water with respect to 100 parts by weight of the monomers; removing the catalyst residue from the reaction mixture, from which the residual monomers and the by-products have been removed, by using a filter having a pore size of less than 50 um; and removing the chlorinated solvent from the reaction mixture, from which the residual monomers and the catalyst residue have been removed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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