Method of manufacturing polyalkylene carbonate

• US 9,447,236 B2
• Filed: 05/27/2014
• Issued: 09/20/2016
• Est. Priority Date: 05/27/2013
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kim, Yoon-Jung, Park, Seung Young, Jung, Taek-Jun, Cho, Yun-Ki
• Primary Examiner(s): Fang, Shane
• Application Number:
  US14/421,091
• Publication Number:
  US 20150218310A1
• Time in Patent Office: 847 Days
• Field of Search: 558/277, 558/260, 568/905, 528/395, 528/405
• US Class Current: 1/1
• CPC Class Codes: B01J 2231/14 Other (co) polymerisation, e.g. of lactides, epoxides "ROMP", i.e. ring-opening metathesis polymerisation B01J2231/54
• CPC Class Codes: B01J 2531/025 Ligands with a porphyrin ring system or analogues thereof, e.g. phthalocyanines, corroles
• CPC Class Codes: B01J 2531/845 Cobalt
• CPC Class Codes: B01J 31/22 Organic complexes
• CPC Class Codes: B01J 31/2243 At least one oxygen and one nitrogen atom present as complexing atoms in an at least bidentate or bridging ligand
• CPC Class Codes: C08G 64/34 and cyclic ethers

Abstract

The present invention relates to a method of manufacturing polyalkylene carbonate. More specifically, the method of manufacturing polyalkylene carbonate includes solution-polymerizing an epoxide compound and carbon dioxide in the presence of a cobalt complex having a neutral singe-site as a catalyst and a solvent, thereby providing stability and adjusting degree of polymerization and being advantageous for performing a post-treatment process after polymerization.

Claims

1. A method of manufacturing polyalkylene carbonate comprising:

solution-polymerizing an epoxide compound and continuously or non-continuously injected carbon dioxide in the presence of a catalyst represented by the following Chemical Formula 1 and 1,2-ethylene dichloride as a solvent,

wherein the solvent is used at a weight ratio of 1;

0.1 to 1;

0.51 based on the epoxide compound;

2. The method of claim 1, wherein in Chemical Formula 1, R₁, R₃, R₅ and R₇ are each independently hydrogen or a C1-C20 alkyl group, R₂, R₄ and R₆ are each independently a C1-C20 alkyl group, Q is C3-C20 cycloalkylene, n is an integer of 1 to 10, and X is —

Cl, —

NO₃ or —

OAc.

3. The method of claim 2, wherein in Chemical Formula 1, R₁, R₃, R₅ and R₇ are each independently hydrogen, R₂, R₄ and R₆ are each independently a tert-butyl group, and Q is C3-C20 cycloalkylene.

4. The method of claim 1, wherein the carbon dioxide is injected at a weight ratio of 0.5:

1 to 10;

1 based on the epoxide compound.

5. The method of claim 1, wherein the solution-polymerizing is performed at a temperature of 50 to 100°

C. for 30 minutes to 9 hours.

6. The method of claim 1, wherein in the solution-polymerizing, an ammonium salt selected from the group consisting of (n-Bu)₄NY (wherein Y═

Cl or OAc), [PPN]Cl, [PPN]Br and [PPN]N₃ is further included as a cocatalyst.

7. The method of claim 1, wherein the epoxide compound is at least one kind selected from the group consisting of C2-C20 alkylene oxide substituted or unsubstituted with halogen or a C1-C5 alkyl group;

C4-C20 cycloalkylene oxide substituted or unsubstituted with halogen or a C1-C5 alkyl group; and

C8-C20 styrene oxide substituted or unsubstituted with halogen or a C1-C5 alkyl group.

8. The method of claim 1, wherein the epoxide compound includes C2-C20 alkylene oxide substituted or unsubstituted with halogen or a C1-C5 alkyl group, and has a carbonate linkage selectivity of 99% or more.

9. The method of claim 1, wherein the polyalkylene carbonate includes polyethylene carbonate having a weight average molecular weight of 1000 to 500,000.