Patent US3926922A successfully refreshed from Google Patents.
US3926922A
Expired / Lapsed
US
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Polyurethane elastomers prepared from diamine curing agents
Assignee: Air Products and Chemicals Inc
•
Filing: 1974-03-14
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Granted: 1975-12-16
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Expires: 1994-03-14
Abstract
Abstract Diamine cured polyurethane products are prepared by combining a isocyanate terminated urethane prepolymer with a compound of the formula: WHEREIN R is hydrogen or alkyl.
Inventors
- 👤 Richard C Baron
- 👤 Leon D Cerankowski
- 👤 Neil Mattucci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:12
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
18 words
A POLYURETHANE PRODUCT PREPARED BY REACTING AN ISOCYANATE TERMINATED URETHANE PREPOLYMER AND A CURING AGENT OF THE FORMULA:
Claim 2
Dependent Claim
18 words
A POLYURETHANE PRODUCT PREPARED BY REACTING AN ISOCYANATE TERMINATED URETHANE PREPOLYMER AND A CURING AGENT OF THE FORMULA:
Claim 3
Dependent Claim
17 words
The product as defined in claim 1 wherein the amine groups are para to the amide groups.
Claim 4
Dependent Claim
17 words
The product as defined in claim 1 wherein the amine groups are meta to the amide groups.
Claim 5
Dependent Claim
29 words
The product of claim 1 wherein the ratio of said curing agent to said urethanE prepolymer is 0.5:1 to 2:1 based on moles of amine to moles of isocyanate.
Claim 6
Dependent Claim
29 words
The product of claim 4 wherein the ratio of said curing agent to said urethane prepolymer is 0.8:1 to 1.2:1 based on moles of amine to moles of isocyanate.
Claim 7
Dependent Claim
27 words
The product of claim 5 wherein the ratio of said curing agent to said urethane prepolymer is 0.9:1 based on moles of amine to moles of isocyanate.
Claim 8
Dependent Claim
18 words
The product of claim 6 wherein said urethane prepolymer has an isocyanate content of about 2-10% by weight.
Claim 9
Dependent Claim
18 words
The product of claim 7 wherein said urethane prepolymer has an isocyanate content of about 4% by weight.
Claim 10
Dependent Claim
15 words
The product of claim 1 wherein said reaction is carried out as a hot melt.
Claim 11
Dependent Claim
22 words
The product of claim 1 wherein said reaction is carried out in a solvent for said urethane prepolymer and said curing agent.
Claim 12
Dependent Claim
11 words
The product of claim 1 wherein said curing agent is p,p''-diaminobenzanilide.
Claim 13
Dependent Claim
11 words
The product of claim 1 wherein said curing agent is 4,3''-diaminobenzanilide.
Claim 14
Dependent Claim
12 words
The product of claim 1 wherein said curing agent is 3,3'',5, 5''-tetraaminobenzanilide.
Claim 15
Independent Claim
23 words
The method of preparing a cured polyurethane composition which comprises reacting an isocyanate terminated urethane prepolymer and a curing agent of the formula:
Claim 16
Independent Claim
23 words
The method of preparing a cured polyurethane composition which comprises reacting an isocyanate terminated urethane prepolymer and a curing agent of the formula:
Claim 17
Dependent Claim
15 words
The method of claim 14 wherein said reaction is carried out in a hot melt.
Claim 18
Dependent Claim
14 words
The method of claim 14 wherein said reaction is carried out in a solution.
Claim 19
Dependent Claim
29 words
The method of claim 14 wherein the ratio of said curing agent to said urethane prepolymer is 0.5:1 to 2:1 based on moles of amine to moles of isocyanate.
Claim 20
Dependent Claim
18 words
The method of claim 14 wherein said urethane prepolymer has an isocyanate content of about 4% by weight.
Claim 21
Dependent Claim
11 words
The method of claim 14 wherein said curing agent is p,p''-diaminobenzanilide.
Claim 22
Dependent Claim
24 words
The method of claim 14 which includes the step of applying the mixture of said urethane prepolymer and said curing agent to a surface.
References Cited (Backward Citations)
US3681290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |