Unlock instant, AI-driven research and patent intelligence for your innovation.

Copolymerization of ethylene oxide and carbon dioxide

Inactive Publication Date: 2019-07-04
CORNELL UNIVERSITY
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes methods for making poly(ethylene carbonate) polymers by reacting ethylene oxide and carbon dioxide in the presence of a specific metal complex. The resulting polymers have low ether content. The technical effect is that these methods provide a new and effective way to produce these polymers with improved properties.

Problems solved by technology

Various systems for EO / CO2 copolymerization based on Zn, Al, or double metal cyanide species have been reported; however, they require high CO2 pressure and suffer from low catalytic activities.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Copolymerization of ethylene oxide and carbon dioxide
  • Copolymerization of ethylene oxide and carbon dioxide
  • Copolymerization of ethylene oxide and carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

example 1

tive Cobalt Catalysts for Alternating Copolymerization of Ethylene Oxide and Carbon Dioxide

[0287]The inventors have recently found that (salcy)CoOBzF5 (salcy=N,N′-bis(3,5-di-tert-butylsalicylidene)-1,2-diaminocyclohexane; OBzF5=pentafluorobenzoate; 1) efficiently copolymerizes cyclohexene oxide (CHO) or propylene oxide (PO) with CO2. However, there has been no report using 1 for the copolymerization of EO and CO2 to make PEC. Herein is reported the development of highly active Co(salcy) catalysts for the copolymerization of EO / CO2 under low CO2 pressure to produce copolymers with high carbonate percentages.

[0288]The recent success using 1 with bis(triphenylphosphoranylidene)ammonium chloride ([PPN]Cl) to copolymerize PO and CO2 led us to investigate this catalytic system for the copolymerization of EO and CO2 (Scheme 1 and Table 2) (see (a) Moore, D. R.; Cheng, M.; Lobkovsky, E. B.; Coates, G. W. Angew. Chem. Int. Ed. 2002, 41, 2599-2602. (b) Cheng, M.; Moore, D. R.; Reczek, J. J.; ...

example 2

ation of Ethylene Oxide (PEO)

[0303](Salcy)CoOBzF5 induced ethylene oxide (EO) polymerization in the presence of PPNCl. The activity was strongly depended on the PPNCl / Co ratio (see Table 7 and FIG. 3).

TABLE 7Effect of [PPNCl] / [Co][PPNCl] / [Co]Product Mass, gYield, %TOF, h−10.20.15353.58360.30.32527.417770.50.20654.711250.70.19174.4104410.10302.3561[EO]0 = 20M,[Co]0 = 5.0 mM,[PPNCl]0 = 1.0-5.0 mM, rt 10 min.

example 3

of Block Copolymer of PEO-b-PEC

[0304]The one-pot PEO-b-PEC synthesis was then examined. PEO was polymerized in a glass autoclave first, and then the reaction solution was pressurized with CO2 to undergo EO / CO2 copolymerization. This polymer consists of hard segment (PEO) / soft segment (PEC), and is thus considered to have a new function (see FIGS. 4A-4B depicting the TGA and DSC analyses of PEO-b-PEC).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Fractionaaaaaaaaaa
Fractionaaaaaaaaaa
Fractionaaaaaaaaaa
Login to View More

Abstract

The present disclosure is directed, in part, to methods of synthesizing a poly(ethylene carbonate) polymer from the reaction of ethylene oxide (EO) and carbon dioxide (CO2) in the presence of a metal complex. The present disclosure also provides novel metal complexes. In one aspect, the metal complex is of the formula (I), wherein R1, R2, R3, M, X and Ring A are as defined herein.

Description

PRIORITY CLAIM[0001]This application is a continuation of U.S. patent application Ser. No. 14 / 627,733, filed Feb. 20, 2015, which is a continuation of U.S. application Ser. No. 13 / 915,320, filed Jun. 11, 2013, which is a continuation of U.S. application Ser. No. 12 / 990,202, filed Dec. 17, 2010, which is a United States National Stage entry of International Application Number PCT / US09 / 42926, filed May 6, 2009, which claims priority to U.S. Provisional Patent Application Ser. No. 61 / 052,061, filed May 9, 2008, the entire contents of each of which is incorporated herein by reference.BACKGROUND[0002]Poly(ethylene carbonate) (PEC) is a flexible, biocompatible, and biodegradable material with high gas barrier properties, particularly for O2. It is made via the ring opening polymerization of ethylene carbonate (EC) or by the copolymerization of ethylene oxide (EO) and CO2. Ring opening polymerization of EC initiated by KOH or Sn(OAc)2 at high temperature leads to poly(ethylene oxide-co-eth...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08G64/34C08G64/18C07F15/06C08G64/02
CPCC08G64/34C08G64/183C07F15/065C08G64/0208
Inventor COATES, GEOFFREY W.ALLEN, SCOTT D.ANDO, TSUYOSHI
Owner CORNELL UNIVERSITY
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com