US5175231A
Expired / Lapsed
US
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Urethane oligomers and polyurethanes
Assignee: FIBER-COTE Corp A CORP OF KENTUCKY
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Filing: 1992-04-17
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Granted: 1992-12-29
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Expires: 2012-04-17
Abstract
Abstract A urethane is formed in a new way, without requiring the use of isocyanates. The urethane is formed by reacting a compound containing a plurality of cyclocarbonate groups with a diamine in which the two amine groups have different reactivities with cyclocarbonate, so as to form a urethane oligomer with amine end groups. The urethane oligomer can then be reacted in several different ways to form polyurethane.
Inventors
- 👤 Leonid Rappoport
- 👤 Roger D. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:15
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/14; C08G59/1405; C08G71/00; C08G71/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
30 words
An oligomer having at least one urethane group and having at least one end fragment containing an amine group, wherein said oligomer is stable at atmospheric pressure and room temperature.
Claim 2
Dependent Claim
30 words
An oligomer having at least one urethane group and having at least one end fragment containing an amine group, wherein said oligomer is stable at atmospheric pressure and room temperature.
Claim 3
Dependent Claim
19 words
An oligomer as recited in claim 1, wherein said oligomer also has a hydroxyl group in the end fragment.
Claim 4
Dependent Claim
25 words
An oligomer as recited in claim 2, wherein the ratio of urethane groups to hydroxyl groups to amine groups in the end fragments is 1:1:1.
Claim 5
Dependent Claim
28 words
An oligomer as recited in claim 1, wherein said oligomer includes a plurality of urethane groups, a plurality of hydroxyl groups, and a plurality of amine end groups.
Claim 6
Dependent Claim
26 words
An oligomer as recited in claim 1, wherein said oligomer is soluble in water and is stable in a solution containing only the oligomer and water.
Claim 7
Dependent Claim
25 words
An oligomer as recited in claim 1, wherein said oligomer is stable in a solution with water which does not contain significant excess monomer amines.
Claim 8
Dependent Claim
38 words
An oligomer having the formula: ##STR5## where U is ##STR6## R 1 is the root of an epoxide resin with the epoxide groups removed, and R 2 is the root of a diamine with the amine groups removed.
Claim 9
Dependent Claim
38 words
An oligomer having the formula: ##STR5## where U is ##STR6## R 1 is the root of an epoxide resin with the epoxide groups removed, and R 2 is the root of a diamine with the amine groups removed.
Claim 10
Dependent Claim
17 words
An oligomer as recited in claim 7, where R 1 has a molecular weight up to 1000.
Claim 11
Dependent Claim
17 words
An oligomer as recited in claim 7, where R 1 is an oligomer of polymerized propylene oxide.
Claim 12
Dependent Claim
14 words
An oligomer as recited in claim 7, where R 2 includes a cycloalifatic ring.
Claim 13
Dependent Claim
43 words
A new method, including the step of reacting a compound including a plurality of cyclocarbonate groups with a diamine having two amine groups of different reactivities, to form an oligomer having at least one urethane group and at least one amine end group.
Claim 14
Dependent Claim
43 words
A new method, including the step of reacting a compound including a plurality of cyclocarbonate groups with a diamine having two amine groups of different reactivities, to form an oligomer having at least one urethane group and at least one amine end group.
Claim 15
Dependent Claim
51 words
A new method as recited in claim 11, wherein the oligomer that is formed has a plurality of urethane groups, a plurality of hydroxyl groups, and a plurality of amine end groups; and including the additional step of reacting that oligomer with an epoxide resin to form a hardened, cross-linked polyurethane.
Claim 16
Dependent Claim
57 words
A new method as recited in claim 11, wherein the oligomer which is formed has at least one amine group and at least one hydroxyl group in an end fragment, and including the additional step of reacting that oligomer with a second oligomer that reacts with the amine group or the hydroxyl group to form a polyurethane.
Claim 17
Dependent Claim
18 words
A new method as recited in claim 13, wherein the second oligomer is an epoxy or an acrylate.
Claim 18
Dependent Claim
43 words
An oligomer as recited in claim 1, wherein said oligomer is soluble in water, and any mixture of the oligomer and water in a mass ratio of from 1:0.2 to 1:1.5 remains liquid at least down to a temperature of -20 degrees Celsius.
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) | 1995-12-29 | 1996-06-29 | 1996-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-29 | 2000-06-29 | 2000-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-29 | 2004-06-29 | 2004-12-29 | $7700.00 | Window Closed / Lapsed |