Copolymerization of propylene oxide and carbon dioxide without production of propylene carbonate

Patent metadata

Field	Value
Publication number	US-9683077-B2
Application number	US-201514669882-A
Country	US
Kind code	B2
Filing date	Mar 26, 2015
Priority date	Aug 24, 2006
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

Copolymers of propylene oxide and carbon dioxide and homopolymers of propylene oxide are made using two dimensional double metal cyanide complexes having the formula Co[M(CN) 4 ] or hydrated or partially dehydrated form thereof. There is no propylene carbonate by product in the copolymerization.

First claim

What is claimed is:

1. A method of preparing a double metal catalyst of formula Co[M(CN) 4 ] comprising:
a. reacting Co(SO 4 ) with K 2 [M(CN) 4 ] to form a hydrated Co[M(CN) 4 ]; and
b. dehydrating the hydrated Co[M(CN) 4 ] to produce the double metal catalyst of formula Co[M(CN) 4 ];
wherein M is selected from Ni, Pt, and Pd.

2. The method of claim 1 , wherein M is Ni.

3. The method of claim 1 , wherein M is Pt.

4. The method of claim 1 , wherein M is Pd.

Assignees

• Cornell Res Foundation Inc

Inventors

• Coates Geoffrey W
• Lee Stephen
• Qin Zengquan
• Robertson Nicholas J

Classifications

• C01C3/08

  Simple or complex cyanides of metals {(C01C3/001, C01C3/002 take precedence)} · CPC title

• C08G65/2663

  Metal cyanide catalysts, i.e. DMC's · CPC title

• C08G64/34

  and cyclic ethers · CPC title

• C08G64/0208 Primary

  saturated · CPC title

• C08G65/2603

  the other compounds containing oxygen · CPC title