US4946939A
Expired / Lapsed
US
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High purity polyether polyols
Assignee: Dow Chemical Co
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Filing: 1989-05-30
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Granted: 1990-08-07
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Expires: 2009-05-30
Abstract
Abstract High purity polyether polyol compositions such as polyethylene glycol are made having small amounts of impurities such as oligomers of active hydrogen compounds with alkylene oxides. The high purity is achieved by subjecting the polyether polyol compositions to membrane filtration to get less than about 10 parts per million of the low molecular weight oligomers.
Inventors
- 👤 Frank H. Murphy
- 👤 Robert T. Jernigan
- 👤 Jeff G. Grierson
- 👤 Wayne G. Wessels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:01
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/30
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
60 words
A high purity polyalkylene polyol composition having a weight average molecular weight range from about 400 to about 15,000 and having as the major impurity a mixture comprising low molecular weight and high molecular weight polyalkylene polyol oligomers wherein said low molecular weight oligomer portion from dimer to pentamer is less than about 10 parts per million for each oligomer.
Claim 2
Dependent Claim
60 words
A high purity polyalkylene polyol composition having a weight average molecular weight range from about 400 to about 15,000 and having as the major impurity a mixture comprising low molecular weight and high molecular weight polyalkylene polyol oligomers wherein said low molecular weight oligomer portion from dimer to pentamer is less than about 10 parts per million for each oligomer.
Claim 3
Dependent Claim
24 words
A high purity composition as set forth in claim 1 wherein the weight average molecular weight range is from about 600 to about 8,000.
Claim 4
Dependent Claim
24 words
A high purity composition as set forth in claim 1 wherein the weight average molecular weight range is from about 800 to about 4,000.
Claim 5
Dependent Claim
29 words
A high purity composition as set forth in claim 1 wherein said low molecular weight oligomer portion from dimer to decamer is less than about 10 part per million.
Claim 6
Dependent Claim
29 words
A high purity composition as set forth in claim 1 wherein said low molecular weight oligomer portion from dimer to pentamer is less than about 1 part per million.
Claim 7
Dependent Claim
29 words
A high purity composition as set forth in claim 1 wherein said low molecular weight oligomer portion from dimer to decamer is less than about 1 part per million.
Claim 8
Dependent Claim
82 words
A high purity polyether polyol composition made from alkylene oxides of two to four carbons and active hydrogen compound initiators, said polyol composition having a weight average molecular weight range from about 400 to about 100,000 and having as the major impurity a mixture comprising low molecular weight and high molecular weight oligomers of said initiators with said alkylene oxides wherein said low molecular weight oligomer portion from dimer to pentamer is less than about 10 parts per million for each oligomer.
Claim 9
Dependent Claim
82 words
A high purity polyether polyol composition made from alkylene oxides of two to four carbons and active hydrogen compound initiators, said polyol composition having a weight average molecular weight range from about 400 to about 100,000 and having as the major impurity a mixture comprising low molecular weight and high molecular weight oligomers of said initiators with said alkylene oxides wherein said low molecular weight oligomer portion from dimer to pentamer is less than about 10 parts per million for each oligomer.
Claim 10
Dependent Claim
25 words
A high purity polyalkylene glycol composition as set forth in claim 7 having a weight average molecular weight range from about 600 to about 8,000.
Claim 11
Dependent Claim
25 words
A high purity polyalkylene glycol composition as set forth in claim 7 having a weight average molecular weight range from about 800 to about 4,000.
Claim 12
Dependent Claim
28 words
A high purity composition as set forth in claim 5 wherein said low molecular weight oligomer portion from dimer to decamer is less than 10 parts per million.
Claim 13
Dependent Claim
29 words
A high purity composition as set forth in claim 7 wherein said low molecular weight oligomer portion from dimer to pentamer is less than about 1 part per million.
Claim 14
Dependent Claim
29 words
A high purity composition as set forth in claim 7 wherein said low molecular weight oligomer portion from dimer to decamer is less than about 1 part per million.
Claim 15
Dependent Claim
60 words
A high purity polyethylene glycol composition having a weight average molecular weight range from about 400 to about 15,000 and having as the major impurity a mixture comprising low molecular weight and high molecular weight polyethylene glycol oligomers wherein said low molecular weight oligomer portion from dimer to pentamer is less than about 10 parts per million for each oligomer.
Claim 16
Dependent Claim
60 words
A high purity polyethylene glycol composition having a weight average molecular weight range from about 400 to about 15,000 and having as the major impurity a mixture comprising low molecular weight and high molecular weight polyethylene glycol oligomers wherein said low molecular weight oligomer portion from dimer to pentamer is less than about 10 parts per million for each oligomer.
Claim 17
Dependent Claim
26 words
A high purity polyethylene glycol composition as set forth in claim 13 wherein the weight average molecular weight range is from about 600 to about 8,000.
Claim 18
Dependent Claim
26 words
A high purity polyethylene glycol composition as set forth in claim 13 wherein the weight average molecular weight range is from about 800 to about 4,000.
Claim 19
Dependent Claim
29 words
A high purity composition as set forth in claim 13 wherein said low molecular weight oligomer portion from dimer to decamer is less than about 1 part per million.
Claim 20
Dependent Claim
29 words
A high purity composition as set forth in claim 13 wherein said low molecular weight oligomer portion from dimer to pentamer is less than about 1 part per million.
Claim 21
Dependent Claim
29 words
A high purity composition as set forth in claim 1 wherein said low molecular weight oligomer portion from dimer to decamer is less than about 1 part per million.
Claim 22
Dependent Claim
125 words
A high purity polyether polyol composition made from alkylene oxides of two to four carbons and active hydrogen compound initiators, having a weight average molecular weight range from about 400 to about 100,000 and having as the major impurity a mixture comprising low molecular weight and high molecular weight oligomers of said initiators with said alkylene oxides wherein said high purity composition is produced by the process comprising the steps of (i) adding at least 2 grams of water per gram of an impure polyol containing residual amounts of said initiators, alkylene oxide monomers and low and high oligomers, and (ii) subjecting the dilute impure polyol to membrane filtration to remove said low molecular weight oligomer portion, initiators, and alkylene oxide monomers with the permeate.
Claim 23
Dependent Claim
125 words
A high purity polyether polyol composition made from alkylene oxides of two to four carbons and active hydrogen compound initiators, having a weight average molecular weight range from about 400 to about 100,000 and having as the major impurity a mixture comprising low molecular weight and high molecular weight oligomers of said initiators with said alkylene oxides wherein said high purity composition is produced by the process comprising the steps of (i) adding at least 2 grams of water per gram of an impure polyol containing residual amounts of said initiators, alkylene oxide monomers and low and high oligomers, and (ii) subjecting the dilute impure polyol to membrane filtration to remove said low molecular weight oligomer portion, initiators, and alkylene oxide monomers with the permeate.
Claim 24
Dependent Claim
27 words
A high purity polyether polyol composition as set forth in claim 19 wherein the membrane used has a molecular weight cut off of at least 150 daltons.
Claim 25
Dependent Claim
118 words
A high purity polyethylene glycol composition made from ethylene oxide and active hydrogen compound initiators, having a weight average molecular weight range from about 400 to about 15,000 and having as the major impurity a mixture comprising low molecular weight and high molecular weight oligomers of said initiators with said ethylene oxide wherein said high purity composition is produced by the process comprising the steps of (i) adding at least 2 grams of water per gram of an impure glycol containing residual amounts of said initiators, ethylene oxide and low and high oligomers, and (ii) subjecting the dilute impure polyol to membrane filtration to remove said low molecular weight oligomer portion, initiators, and ethylene oxide with the permeate.
Claim 26
Dependent Claim
118 words
A high purity polyethylene glycol composition made from ethylene oxide and active hydrogen compound initiators, having a weight average molecular weight range from about 400 to about 15,000 and having as the major impurity a mixture comprising low molecular weight and high molecular weight oligomers of said initiators with said ethylene oxide wherein said high purity composition is produced by the process comprising the steps of (i) adding at least 2 grams of water per gram of an impure glycol containing residual amounts of said initiators, ethylene oxide and low and high oligomers, and (ii) subjecting the dilute impure polyol to membrane filtration to remove said low molecular weight oligomer portion, initiators, and ethylene oxide with the permeate.
Claim 27
Dependent Claim
27 words
A high purity polyethylene glycol composition as set forth in claim 21 wherein the membrane used has a molecular weight cut off of at least 150 daltons.
Claim 28
Dependent Claim
105 words
A process for making high purity polyether polyol compositions wherein said high purity composition is produced by the process comprising the steps of (i) adding at least 2 grams of water per gram of an impure polyol made from alkylene oxides of two to four carbons and active hydrogen compound initiators and having a weight average molecular weight range from about 400 to about 100,000 containing residual amounts of said initiators, alkylene oxide monomers and low and high oligomers, and (ii) subjecting the dilute impure polyol to membrane filtration to remove said low molecular weight oligomer portion, initiators, and alkylene oxide monomers with the permeate.
Claim 29
Dependent Claim
105 words
A process for making high purity polyether polyol compositions wherein said high purity composition is produced by the process comprising the steps of (i) adding at least 2 grams of water per gram of an impure polyol made from alkylene oxides of two to four carbons and active hydrogen compound initiators and having a weight average molecular weight range from about 400 to about 100,000 containing residual amounts of said initiators, alkylene oxide monomers and low and high oligomers, and (ii) subjecting the dilute impure polyol to membrane filtration to remove said low molecular weight oligomer portion, initiators, and alkylene oxide monomers with the permeate.
Claim 30
Dependent Claim
23 words
A process as set forth in claim 23 wherein the membrane used has a molecular weight cut off of at least 150 daltons.
Claim 31
Dependent Claim
107 words
A process for making high purity polyethylene glycol compositions wherein said high purity composition is produced by the process comprising the steps of (i) adding at least 2 grams of water per gram of an impure polyethylene glycol made from alkylene oxides of two to four carbons and active hydrogen compound initiators and having a weight average molecular weight range from about 400 to about 100,000 containing residual amounts of said initiators, alkylene oxide monomers and low and high oligomers, and (ii) subjecting the dilute impure polyethylene glycol to membrane filtration to remove said low molecular weight oligomer portion, initiators, and alkylene oxide monomers with the permeate.
Claim 32
Dependent Claim
107 words
A process for making high purity polyethylene glycol compositions wherein said high purity composition is produced by the process comprising the steps of (i) adding at least 2 grams of water per gram of an impure polyethylene glycol made from alkylene oxides of two to four carbons and active hydrogen compound initiators and having a weight average molecular weight range from about 400 to about 100,000 containing residual amounts of said initiators, alkylene oxide monomers and low and high oligomers, and (ii) subjecting the dilute impure polyethylene glycol to membrane filtration to remove said low molecular weight oligomer portion, initiators, and alkylene oxide monomers with the permeate.
Claim 33
Dependent Claim
23 words
A process as set forth in claim 25 wherein the membrane used has a molecular weight cut off of at least 150 daltons.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |