EP0383333A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for purifying a polyoxyalkylene alcohol
Assignee: AGC Inc
•
Filing: 1990-02-15
•
Granted: —
•
Expires: 2010-02-15
Abstract
Abstract A method for purifying a polyoxyalkylene alcohol, which comprises treating with a treating agent consisting essentially of a pH buffer, a polyoxyalkylene alcohol containing a double metal cyanide complex catalyst, synthesized by ring-opening polymerization of an alkylene oxide in the presence of said catalyst, and then removing the catalyst and the treating agent from the polyoxyalkylene alcohol.
Inventors
- 👤 Takashi Watabe
- 👤 Hiromitsu Takeyasu
- 👤 Takao Doi
- 👤 Nobuaki Kunii
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 12:44
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2642; C08G65/2645; C08G65/2663; C08G65/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
57 words
A method for purifying a polyoxyalkylene alcohol, which comprises treating with a treating agent consisting essentially of a pH buffer, a polyoxyalkylene alcohol containing a double metal cyanide complex catalyst, synthesized by ring-opening polymerization of an alkylene oxide in the presence of said catalyst, and then removing the catalyst and the treating agent from the polyoxyalkylene alcohol.
Claim 2
Independent Claim
57 words
A method for purifying a polyoxyalkylene alcohol, which comprises treating with a treating agent consisting essentially of a pH buffer, a polyoxyalkylene alcohol containing a double metal cyanide complex catalyst, synthesized by ring-opening polymerization of an alkylene oxide in the presence of said catalyst, and then removing the catalyst and the treating agent from the polyoxyalkylene alcohol.
Claim 3
Dependent Claim
16 words
The method according to Claim 1, wherein ammonia is used in combination with the pH buffer.
Claim 4
Dependent Claim
14 words
The method according to Claim 1, wherein the pH buffer is an ammonium salt.
Claim 5
Dependent Claim
65 words
The method according to Claim 1, wherein the removal of the catalyst and the treating agent is conducted by an adsorption removal method by means of a solid adsorbent, wherein the solid adsorbent contains a structure of an oxide or hydroxide of at least one metal selected from the group consisting of magnesium, aluminum and silicon, or the solid adsorbent is an ion exchange resin.
Claim 6
Dependent Claim
23 words
The method according to Claim 6, wherein removal of volatile components under reduced pressure is conducted in combination with the adsorption removal method.
Claim 7
Independent Claim
81 words
A method for purifying a polyoxyalkylene alcohol, which comprises treating with a treating agent consisting essentially of at least one member selected from the group consisting of a pH buffer and an aqueous ammonia solution, a polyoxyalkylene alcohol containing a double metal cyanide complex catalyst, synthesized by ring-opening polymerization of an alkylene oxide in the presence of said catalyst, reacting simultaneously or subsequently a metal ion chelating agent, and then removing the catalyst and the treating agent from the polyoxyalkylene alcohol.
Claim 8
Independent Claim
81 words
A method for purifying a polyoxyalkylene alcohol, which comprises treating with a treating agent consisting essentially of at least one member selected from the group consisting of a pH buffer and an aqueous ammonia solution, a polyoxyalkylene alcohol containing a double metal cyanide complex catalyst, synthesized by ring-opening polymerization of an alkylene oxide in the presence of said catalyst, reacting simultaneously or subsequently a metal ion chelating agent, and then removing the catalyst and the treating agent from the polyoxyalkylene alcohol.
Claim 9
Dependent Claim
14 words
The method according to Claim 6, wherein the pH buffer is an ammonlum salt.
Claim 10
Dependent Claim
37 words
The method according to Claim 6, wherein the metal ion chelating agent is at least one member selected from the group consisting of an amino carboxylic acid compound and a salt of an amino carboxylic acid compound.
Claim 11
Dependent Claim
66 words
The method according to Claim 6, wherein the removal of the catalyst and the treating agent is conducted by an adsorption removal method by means of a solid adsorbent, wherein the solid adsorbent contains a structure of an oxide or a hydroxide of at least one metal selected from the group consisting of magnesium, aluminum and silicon, or the solid adsorbent is an ion exchange resin.
Claim 12
Dependent Claim
23 words
The process according to Claim 9, wherein removal of volatile components under reduced pressure is conducted in combination with the adsorption removal method.
References Cited (Backward Citations)
GB2085457A
Cited
US4721818A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.