Patent US4120903A successfully refreshed from Google Patents.
US4120903A
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Method for preparing poly(tetramethylene ether) glycol
Assignee: EIDP Inc
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Filing: 1977-03-30
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Granted: 1978-10-17
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Expires: 1997-03-30
Abstract
Abstract Poly(tetramethylene ether) glycol is prepared by polymerizing tetrahydrofuran, using (1) a polymeric catalyst which contains sulfonic acid groups, and (2) a chain terminator which is water or 1,4-butanediol.
Inventors
- 👤 Gerfried Pruckmayr
- 👤 Robert H. Weir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:09
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/16; C08G65/20; C08G65/26; C08G65/2642; C08G65/2669; C08G65/2678
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
53 words
In a process for preparing poly(tetramethylene ether) glycol by polymerizing tetrahydrofuran using water or 1,4-butanediol as a chain terminator, the improvement comprising using as a catalyst a polymer of monoethylenically unsaturated monomers, the polymer being effectively free of functional groups which interfere with the polymerization and containing groups of the formula ##STR5## where
Claim 2
Dependent Claim
53 words
In a process for preparing poly(tetramethylene ether) glycol by polymerizing tetrahydrofuran using water or 1,4-butanediol as a chain terminator, the improvement comprising using as a catalyst a polymer of monoethylenically unsaturated monomers, the polymer being effectively free of functional groups which interfere with the polymerization and containing groups of the formula ##STR5## where
Claim 3
Dependent Claim
8 words
represents the polymer chain or a segment thereof;
Claim 4
Dependent Claim
8 words
represents the polymer chain or a segment thereof;
Claim 5
Dependent Claim
24 words
D is hydrogen, an aliphatic or aromatic hydrocarbon radical of 1 to 10 carbon atoms, a halogen or a segment of the polymer chain;
Claim 6
Dependent Claim
24 words
D is hydrogen, an aliphatic or aromatic hydrocarbon radical of 1 to 10 carbon atoms, a halogen or a segment of the polymer chain;
Claim 7
Dependent Claim
30 words
X and Y are hydrogen, an aliphatic or aromatic hydrocarbon radical of 1 to 10 carbon atoms, or fluorine, but at least one of X and Y must be fluorine;
Claim 8
Dependent Claim
30 words
X and Y are hydrogen, an aliphatic or aromatic hydrocarbon radical of 1 to 10 carbon atoms, or fluorine, but at least one of X and Y must be fluorine;
Claim 9
Dependent Claim
19 words
R is a linear or branched linking group having up to 40 carbon atoms in the principal chain; and
Claim 10
Dependent Claim
19 words
R is a linear or branched linking group having up to 40 carbon atoms in the principal chain; and
Claim 11
Dependent Claim
17 words
Z is hydrogen, an aliphatic or aromatic hydrocarbon radical of 1 to 10 carbon atoms, or halogen.
Claim 12
Dependent Claim
17 words
Z is hydrogen, an aliphatic or aromatic hydrocarbon radical of 1 to 10 carbon atoms, or halogen.
Claim 13
Dependent Claim
14 words
The process of claim 1 wherein the catalyst is a polymer of fluorocarbon monomers.
Claim 14
Dependent Claim
19 words
The process of claim 2 wherein the catalyst is a copolymer of tetrafluoroethylene or chlorotrifluoroethylene and R is ##STR6##
Claim 15
Dependent Claim
39 words
The process of claim 3 wherein the catalyst is a hydrolyzed copolymer of tetrafluoroethylene or chlorotrifluoroethylene and a monomer represented by the structure ##STR7## the tetrafluoroethylene or chlorotrifluoroethylene and monomer units being present in weight ratios of 50-75/25-50, respectively.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |