US4383100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethanes from oligomeric formal diols of THF copolymer glycols
Assignee: EIDP Inc
•
Filing: 1982-01-19
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Granted: 1983-05-10
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Expires: 2002-01-19
Abstract
Abstract Oligomeric formal diols are prepared by coupling segments of copolyether glycols with formaldehyde. The formal diols are useful in preparing polyurethanes.
Inventors
- 👤 Engelbert Pechhold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:42
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/56; C07; C07C; C07C43/00; C07C43/30; C07C43/315; C08G4/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
54 words
A polyurethane which is the reaction product of (a) an oligomeric formal diol made by coupling segments of copolymers of tetrahydrofuran and an alkylene oxide whose ring contains 2 or 3 carbon atoms with formaldehyde, the diol having a number average molecular weight of 1200-12000, (b) an organic polyisocyanate, and (c) a chain extender.
Claim 2
Dependent Claim
54 words
A polyurethane which is the reaction product of (a) an oligomeric formal diol made by coupling segments of copolymers of tetrahydrofuran and an alkylene oxide whose ring contains 2 or 3 carbon atoms with formaldehyde, the diol having a number average molecular weight of 1200-12000, (b) an organic polyisocyanate, and (c) a chain extender.
Claim 3
Dependent Claim
15 words
The polyurethane of claim 1 in which the polyisocyanate is diphenylmethane-4,4'-diisocyanate or a toluene diisocyanate.
Claim 4
Dependent Claim
18 words
The polyurethane of claim 1 in which the chain extender is an aliphatic polyamine or an aromatic polyamine.
Claim 5
Dependent Claim
18 words
The polyurethane of claim 3 in which the chain extender is an aliphatic diol of 2-10 carbon atoms.
Claim 6
Dependent Claim
11 words
The polyurethane of claim 4 wherein the aliphatic diol is 1,4-butanediol.
Claim 7
Dependent Claim
12 words
An oligomeric formal diol made by coupling copolyether glycol segments with formaldehyde.
Claim 8
Dependent Claim
12 words
An oligomeric formal diol made by coupling copolyether glycol segments with formaldehyde.
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) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |