Method of preparing catalyst for polymerization of aliphatic...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From heterocyclic reactant containing as ring atoms oxygen,...

Reexamination Certificate

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C502S150000, C525S072000, C525S080000, C525S181000, C525S185000, C525S331200, C525S331200, C525S340000, C525S346000, C528S196000, C528S198000, C528S405000

Reexamination Certificate

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10519176

ABSTRACT:
Disclosed is a method of preparing a catalyst for polymerization of aliphatic polycarbonates and a method of polymerizing an aliphatic polycarbonate. This method includes reacting a zinc precursor and organic dicarboxylic acid in a non-ionic surfactant-included solution.

REFERENCES:
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patent: 4960862 (1990-10-01), Carroll et al.
patent: 5605981 (1997-02-01), Imamura et al.
patent: 2003425 (1990-01-01), None
patent: WO 99/11694 (1999-03-01), None
Li-Chen, et al. Copolymerization of carbon dioxide and propylene oxide and zince catlaysts supprted on carbonayl containing-polymer, Guangzhou Instit. of Chem. Acad. Sinica Guangzhou, China J,. Macromol. Sci. chem. A24 (3&4), pp. 253-260 (1987).
Rhee et al., “A New Copolymerization Process Leading to Poly (Propylene Carbonate) With a Highly Enhanced Yield From Carbon Dioxide and Propylene Oxide,” J. of Polymer Science: Part A: Polymer Chemistry, 37:1883-1876 (1999).
Chen et al., “Copolymerization of Carbon Dioxide and Propylene Oxide With Zinc Catalysts Supported on Carboxyl-Containing Polymers,” J. Macromol. Sci.-Chem., A24 (3&4):253-260 (1987).

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