EP0406440A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Production of polyether
Assignee: AGC Inc
•
Filing: 1989-12-28
•
Granted: —
•
Expires: 2009-12-28
Abstract
Abstract This invention relates to a method for producing a polyether comprising conducting ring-opening addition reaction between a hydroxyl-containing initiator and a number of monoepoxide molecules each having at least three carbon atoms, particularly alkylene oxide molecules, in the presence of a composite metal cyanide complex as a catalyst, treating the formed polyether containing the catalyst with a treatment comprising an alkali metal alcoholate to thereby deactivate the catalyst, and removing the deactivated catalyst and the remaining treatment from the polyether. The invention also relates to a method for producing a polyether comprising deactivating the catalyst with the treatment, reacting the formed polyether with ethylene oxide, and removing the deactivated catalyst and the remaining treatment from the polyether. The use of the treatment comprising an alkali metal alcoholate facilitates the removal of the composite metal cyanide complex from the polyether and the production of oxyethylene-terminated polyether.
Inventors
- 👤 Hiromitsu Takeyasu
- 👤 Takao 412-1 Iijimacho Doi
- 👤 Yoshihiro Ohtsuka
- 👤 Nobuaki Kunii
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 21:38
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2642; C08G65/2645; C08G65/2663; C08G65/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
A process for producing a polyether, which comprises treating a polyether obtained by subjecting a monoepoxide having at least 3 carbon atoms to a ring-opening addition reaction to an initiator having at least one hydroxyl group in the presence of a double metal cyanide complex catalyst, and containing said catalyst, with a treating agent composed of an alkali metal alcoholate to deactivate said catalyst, and then removing the deactivated catalyst component and the treating agent component from the polyether.
Claim 2
Dependent Claim
79 words
A process for producing a polyether, which comprises treating a polyether obtained by subjecting a monoepoxide having at least 3 carbon atoms to a ring-opening addition reaction to an initiator having at least one hydroxyl group in the presence of a double metal cyanide complex catalyst, and containing said catalyst, with a treating agent composed of an alkali metal alcoholate to deactivate said catalyst, and then removing the deactivated catalyst component and the treating agent component from the polyether.
Claim 3
Dependent Claim
41 words
The process according to Claim 1, wherein to the polyether containing the catalyst, the treating agent composed of an alkali metal alcoholate is added and heated, and then the catalyst component and the treating agent component are removed from the polyether.
Claim 4
Dependent Claim
91 words
A process for producing a polyether, which comprises treating a polyether obtained by subjecting a monoepoxide having at least 3 carbon atoms to a ring-opening addition reaction to an initiator having at least one hydroxyl group in the presence of a double metal cyanide complex catalyst, and containing said catalyst, with a treating agent composed of an alkali metal alcoholate to deactivate said catalyst, then using the polyether as an initiator, reacting ethylene oxide thereto, and thereafter removing the deactivated catalyst component and the treating agent component from the obtained polyether.
Claim 5
Dependent Claim
91 words
A process for producing a polyether, which comprises treating a polyether obtained by subjecting a monoepoxide having at least 3 carbon atoms to a ring-opening addition reaction to an initiator having at least one hydroxyl group in the presence of a double metal cyanide complex catalyst, and containing said catalyst, with a treating agent composed of an alkali metal alcoholate to deactivate said catalyst, then using the polyether as an initiator, reacting ethylene oxide thereto, and thereafter removing the deactivated catalyst component and the treating agent component from the obtained polyether.
Claim 6
Dependent Claim
25 words
The process according to Claim 3, wherein the alkali metal alcoholate is at least one alkali metal alcoholate selected from sodium alcoholate and potassium alcoholate.
Claim 7
Dependent Claim
23 words
The process according to Claim 3, wherein the alkali metal alcoholate is an alcoholate of an alcohol having at most 4 carbon atoms.
Claim 8
Dependent Claim
30 words
The process according to Claim 3, wherein the alkali metal alcoholate is an alcoholate.of an alkali metal selected from sodium and potassium, with an alcohol selected from methanol and ethanol.
Claim 9
Dependent Claim
25 words
The process according to Claim 3, wherein the monoepoxide having at least 3 carbon atoms is an alkylene oxide having 3 or 4 carbon atoms.
Claim 10
Dependent Claim
19 words
, The process according to Claim 3, wherein the monoepoxide having at least 3 carbon atoms is propylene oxide.
Claim 11
Dependent Claim
40 words
The process according to Claim 3, wherein to the polyether containing the catalyst, the treating agent composed of an alkali metal alcoholate is added and heated, then, an alcohol produced as byproduct is removed, and thereafter ethylene oxide is reacted.
Claim 12
Dependent Claim
15 words
The process according to Claim 9, wherein the heating temperature is from 100 to 150°C.
Claim 13
Dependent Claim
18 words
The process according to Claim 9, wherein the removal of the alcohol is conducted by reducing the pressure.
Claim 14
Dependent Claim
34 words
The process according to Claim 3, wherein the polyether is a polyether obtained by reacting at least 50 mols of the monoepoxide having at least 3 carbon atoms to 1 mol of the initiator.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.