Patent DE1063191B successfully refreshed from Google Patents.
US4054556A
Expired / Lapsed
US
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Polyurethanes cured with derivatives of 2,4-diamino-benzoic acid
Assignee: Uniroyal Chemical Co Inc
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Filing: 1972-09-15
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Granted: 1977-10-18
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Expires: 1992-09-15
Abstract
Abstract Polyurethane/polyurea compositions comprising the reaction product of an organic diisocyanate, a glycol having a molecular weight of 500-5000 and a derivative of 2,4-diaminobenzoic acid selected from C 1 -C 8 alkyl and substituted alkyl esters, the amide, alkyl substitued amides, the anilide, substituted anilides, the nitrile and mixtures thereof.
Inventors
- 👤 Norman Martin van Gulick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:42
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
24 words
Polyurethane elastomers which contain structural units of the formula ##STR3## and mixtures thereof in which R is a C 1 -C 8 alkyl radical.
Claim 2
Dependent Claim
24 words
Polyurethane elastomers which contain structural units of the formula ##STR3## and mixtures thereof in which R is a C 1 -C 8 alkyl radical.
Claim 3
Dependent Claim
64 words
A polyurethane, polyurea composition which consists essentially of the reaction product of a glycol having weight of about 500-5,000 and an organic diisocyanate to form a prepolymer and then curing said prepolymer with a curing agent having the general formula: ##STR4## wherein Y = CO 2 R 1 and R 1 is selected from the group consisting of C 1 -C 4 alkyl groups.
Claim 4
Dependent Claim
64 words
A polyurethane, polyurea composition which consists essentially of the reaction product of a glycol having weight of about 500-5,000 and an organic diisocyanate to form a prepolymer and then curing said prepolymer with a curing agent having the general formula: ##STR4## wherein Y = CO 2 R 1 and R 1 is selected from the group consisting of C 1 -C 4 alkyl groups.
Claim 5
Dependent Claim
12 words
The composition of claim 2 wherein said curing agent is methyl 2,4-diaminobenzoate.
Claim 6
Dependent Claim
11 words
The composition of claim 3 wherein said diisocyanate comprises 2,4-tolylene diisocyanate.
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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |