US4224432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethanes prepared with tetrahydrofuran-alkylene oxide polymerizates having low oligomeric cyclic ether content
Assignee: EIDP Inc
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Filing: 1978-12-11
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Granted: 1980-09-23
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Expires: 1998-12-11
Abstract
Abstract The resistance to degradation on exposure to high temperatures, water and organic liquids of a polyurethane prepared by reacting a tetrahydrofuran/alkylene oxide polymerizate, an organic polyisocyanate and a chain extender is significantly improved by using a tetrahydrofuran/alkylene oxide polymerizate which contains no more than about 3%, by weight, of oligomeric cyclic ethers.
Inventors
- 👤 Engelbert Pechhold
- 👤 Ivan M. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:11
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4854
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
56 words
A polyurethane which is the reaction product of (A) a polymerizate of tetrahydrofuran and an alkylene oxide whose ring contains two or three carbon atoms, the polymerizate containing no more than about 3%, by weight, of oligomeric cyclic ethers; (B) an organic polyisocyanate; and, (C) a chain extender which is an aliphatic polyol or a polyamine.
Claim 2
Dependent Claim
56 words
A polyurethane which is the reaction product of (A) a polymerizate of tetrahydrofuran and an alkylene oxide whose ring contains two or three carbon atoms, the polymerizate containing no more than about 3%, by weight, of oligomeric cyclic ethers; (B) an organic polyisocyanate; and, (C) a chain extender which is an aliphatic polyol or a polyamine.
Claim 3
Dependent Claim
22 words
The polyurethane of claim 1 wherein the polymerizate in (A) contains no more than about 1%, by weight, of oligomeric cyclic ethers.
Claim 4
Dependent Claim
16 words
The polyurethane of claim 1 wherein the polymerizate in (A) is of THF and ethylene oxide.
Claim 5
Dependent Claim
16 words
The polyurethane of claim 1 wherein the polyisocyanate in (B) is diphenylmethane-4,4'-diisocyanate or a toluene diisocyanate.
Claim 6
Dependent Claim
32 words
The polyurethane of claim 1 wherein the chain extender in (C) is 1,4-butanediol; p,p'-methylene dianiline and complexes thereof with alkali metal chlorides, bromides, iodides, nitrites and nitrates; 4,4'-methylene bis(2-chloroaniline) or 1,3-propanediol bis(p-aminobenzoate).
Claim 7
Dependent Claim
35 words
A polyurethane which is the reaction product of (A) a polymerizate of tetrahydrofuran and ethylene oxide, the polymerizate containing no more than about 1%, by weight, of oligomeric cyclic ethers; (B) diphenylmethane-4,4'-diisocyanate; and, (C) 1,4-butanediol.
Claim 8
Dependent Claim
35 words
A polyurethane which is the reaction product of (A) a polymerizate of tetrahydrofuran and ethylene oxide, the polymerizate containing no more than about 1%, by weight, of oligomeric cyclic ethers; (B) diphenylmethane-4,4'-diisocyanate; and, (C) 1,4-butanediol.
Claim 9
Dependent Claim
92 words
In a process for preparing a polyurethane, the process comprising bringing together, under conditions suitable for reaction (A) a polymerizate of tetrahydrofuran and an alkylene oxide whose ring contains two or three carbon atoms; (B) an excess over the stoichiometric amount of an organic polyisocyanate; and, (C) an amount of an aliphatic polyol or a polyamine calculated to give an isocyanate/hydroxyl or amine mole ratio of about 0.9-1.1 to 1, the improvement comprising use of a tetrahydrofuran/alkylene oxide polymerizate which contains no more than about 3%, by weight, of oligomeric cyclic ethers.
Claim 10
Dependent Claim
92 words
In a process for preparing a polyurethane, the process comprising bringing together, under conditions suitable for reaction (A) a polymerizate of tetrahydrofuran and an alkylene oxide whose ring contains two or three carbon atoms; (B) an excess over the stoichiometric amount of an organic polyisocyanate; and, (C) an amount of an aliphatic polyol or a polyamine calculated to give an isocyanate/hydroxyl or amine mole ratio of about 0.9-1.1 to 1, the improvement comprising use of a tetrahydrofuran/alkylene oxide polymerizate which contains no more than about 3%, by weight, of oligomeric cyclic ethers.
Claim 11
Dependent Claim
29 words
The process of claim 7 wherein reactants (A) and (B) are brought together first, and reactant (C) and the product of reactants (A) and (B) are then brought together.
Claim 12
Dependent Claim
9 words
An article cast from the polyurethane of claim 1.
Claim 13
Dependent Claim
9 words
A fiber spun from the polyurethane of claim 1.
References Cited (Backward Citations)
US3425999A
Cited
US4071492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |