US4987271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for purifying a polyoxyalkylene alcohol
Assignee: AGC Inc
•
Filing: 1990-02-14
•
Granted: 1991-01-22
•
Expires: 2010-02-14
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
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:20
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2642; C08G65/2645; C08G65/2663; C08G65/30
Claims Analysis
Total Claims: 21
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
20 words
The method according to claim 1, wherein the treating agent is an aqueous solution containing an ammonium salt and ammonia.
Claim 6
Dependent Claim
37 words
The method according to claim 1, wherein the treating agent is an aqueous solution containing ammonia and at least one pH buffer selected from the group consisting of ammonium chloride, ammonium sulfate, ammonium acetate and ammonium formate.
Claim 7
Dependent Claim
29 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.
Claim 8
Dependent Claim
33 words
The method according to claim 6, 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.
Claim 9
Dependent Claim
15 words
The method according to claim 6, wherein the solid adsorbent is an ion exchange resin.
Claim 10
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 11
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 12
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 13
Dependent Claim
14 words
The method according to claim 10, wherein the pH buffer is an ammonium salt.
Claim 14
Dependent Claim
20 words
The method according to claim 10, wherein the treating agent is an aqueous solution containing an ammonium salt and ammonia.
Claim 15
Dependent Claim
37 words
The method according to claim 10, wherein the treating agent is an aqueous solution containing ammonia and at least one pH buffer selected from the group consisting of ammonium chloride, ammonium sulfate, ammonium acetate and ammonium formate.
Claim 16
Dependent Claim
37 words
The method according to claim 10, 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 17
Dependent Claim
29 words
The method according to claim 14, wherein the amino carboxylic acid compound is at least one member selected from the group consisting of ethylenediamine tetraacetic acid and nitrilotriacetic acid.
Claim 18
Dependent Claim
29 words
The method according to claim 10, wherein the removal of the catalyst and the treating agent is conducted by an adsorption removal method by means of a solid adsorbent.
Claim 19
Dependent Claim
34 words
The method according to claim 16, 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.
Claim 20
Dependent Claim
15 words
The method according to claim 16, wherein the solid adsorbent is an ion exchange resin.
Claim 21
Dependent Claim
23 words
The process according to claim 16, 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
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-21 | 1994-07-23 | 1995-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-21 | 1998-07-23 | 1999-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-21 | 2002-07-23 | 2003-01-22 | $7700.00 | Window Closed / Lapsed |