US3932360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane elastomers prepared from diamine curing agents
Assignee: Air Products and Chemicals Inc
•
Filing: 1974-04-22
•
Granted: 1976-01-13
•
Expires: 1994-04-22
Abstract
Abstract Diamine cured polyurethane products are prepared by combining an isocyanate terminated urethane prepolymer with a compound of the formula: ##SPC1## Wherein X is a 2-12 carbon alkylene or cycloalkylene group.
Inventors
- 👤 Leon D. Cerankowski
- 👤 Neil Mattucci
- 👤 Richard C. Baron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:08
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
29 words
A polyurethane product prepared by reacting an isocyanate terminated urethane prepolymer and a curing agent of the formula: ##SPC4## wherein X is a 2-12 carbon alkylene or cycloalkylene group.
Claim 2
Dependent Claim
29 words
A polyurethane product prepared by reacting an isocyanate terminated urethane prepolymer and a curing agent of the formula: ##SPC4## wherein X is a 2-12 carbon alkylene or cycloalkylene group.
Claim 3
Dependent Claim
14 words
The product of claim 1 wherein said urethane is a polyether type urethane prepolymer.
Claim 4
Dependent Claim
14 words
The product of claim 1 wherein said urethane is a polyester type urethane prepolymer.
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
20 words
The product as defined in 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 1 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
12 words
The product of claim 1 wherein said curing agent is 1,3-propanediol di-p-aminobenzoate.
Claim 13
Dependent Claim
12 words
The product of claim 1 wherein said curing agent is 1,3-butanediol di-p-aminobenzoate.
Claim 14
Independent Claim
34 words
The method of preparing a cured polyurethane prepolymer which comprises reacting an isocyanate terminated urethane composition and a curing agent of the formula: ##SPC5## wherein X is a 2-12 carbon alkylene or cycloalkylene group.
Claim 15
Independent Claim
34 words
The method of preparing a cured polyurethane prepolymer which comprises reacting an isocyanate terminated urethane composition and a curing agent of the formula: ##SPC5## wherein X is a 2-12 carbon alkylene or cycloalkylene group.
Claim 16
Dependent Claim
15 words
The method of claim 13 wherein said reaction is carried out in a hot melt.
Claim 17
Dependent Claim
14 words
The method of claim 13 wherein said reaction is carried out in a solution.
Claim 18
Dependent Claim
29 words
The method of claim 13 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 19
Dependent Claim
18 words
The method of claim 13 wherein said urethane prepolymer has an isocyanate content of about 4% by weight.
Claim 20
Dependent Claim
12 words
The method of claim 13 wherein said curing agent is 1,3-propanediol di-p-aminobenzoate.
Claim 21
Dependent Claim
24 words
The method of claim 13 which includes the step of applying the mixture of said urethane composition and said curing agent to a surface.
Claim 22
Dependent Claim
12 words
The product of claim 1 wherein said curing agent is 1,5-pentanediol di-p-aminobenzoate.
Claim 23
Dependent Claim
12 words
The method of claim 13 wherein said curing agent is 1,5-pentanediol di-p-aminobenzoate.
References Cited (Backward Citations)
US3817940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |