US4089822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel polyurethane curative
Assignee: Air Products and Chemicals Inc
•
Filing: 1976-05-05
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Granted: 1978-05-16
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Expires: 1996-05-05
Abstract
Abstract A polyurethane elastomer exhibiting a low glass transition temperature is provided, which comprises the reaction product of (a) a polyurethane prepolymer having terminally reactive isocyanate groups, prepared by reaction of a polymeric diol with a stoichiometric excess of 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate or a mixture of tolylene diisocyanates containing a major proportion of the 2,4-isomer, with (b) from 80 to 110% of the stoichiometrically required amount of 2,6-dichloro-p-phenylene diamine, and (c) from about 0.01 to 1 part per hundred of prepolymer of a conventional polyurethane catalyst.
Inventors
- 👤 Theodore Merriam Vial
- 👤 Nicholas Peter Ermidis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:35
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7614; C08G18/7621; C08G18/08; C08G18/10; C08G18/16; C08G18/166; C08G18/168
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
104 words
A polyurethane elastomer comprising the reaction product of (a) a polyurethane prepolymer having terminally reactive isocyanate groups, prepared by reaction of a polymeric diol with a stoichiometric excess of 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate or a mixture of tolylene diisocyanates containing a major proportion of the 2,4-isomer, with (b) from 80 to 110% of the stoichiometrically required amount of 2,6-dichloro-p-phenylene diamine, or 2,6-dibromo-p-phenylene diamine in the presence of from about 0.01 to 1 part per hundred of prepolymer of a catalyst selected from the group consisting of mono and dicarboxylic acids, metal salts of mono and dicarboxylic acids, carboxylic acid anhydrides, and tertiary amines .
Claim 2
Dependent Claim
104 words
A polyurethane elastomer comprising the reaction product of (a) a polyurethane prepolymer having terminally reactive isocyanate groups, prepared by reaction of a polymeric diol with a stoichiometric excess of 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate or a mixture of tolylene diisocyanates containing a major proportion of the 2,4-isomer, with (b) from 80 to 110% of the stoichiometrically required amount of 2,6-dichloro-p-phenylene diamine, or 2,6-dibromo-p-phenylene diamine in the presence of from about 0.01 to 1 part per hundred of prepolymer of a catalyst selected from the group consisting of mono and dicarboxylic acids, metal salts of mono and dicarboxylic acids, carboxylic acid anhydrides, and tertiary amines .
Claim 3
Dependent Claim
12 words
An elastomer according to claim 1 wherein the catalyst is stearic acid.
Claim 4
Dependent Claim
12 words
An elastomer according to claim 1 wherein the catalyst is azaleic acid.
Claim 5
Dependent Claim
12 words
An elastomer according to claim 1 wherein the catalyst is stannous octoate.
Claim 6
Dependent Claim
12 words
An elastomer according to claim 1 wherein the catalyst is triethylene diamine.
Claim 7
Dependent Claim
20 words
An elastomer according to claim 1 wherein there is additionally added from about 1% to 10% of a solubilizing agent.
Claim 8
Dependent Claim
17 words
An elastomer according to claim 6 wherein the solubilizing agent is the dimethyl ether of tetraethylene glycol.
Claim 9
Dependent Claim
96 words
A diamine curative system for polyurethane prepolymers having terminally reactive isocyanate groups, prepared by reaction of a polymeric diol with a stoichiometric excess of 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate or a mixture of tolylene diisocyanates containing a major proportion of the 2,4-isomer consisting essentially of from about 80 to 110% of the stoichiometrically required amount of 2,6-dichloro-p-phenylene diamine, 2,6-dibromo-p-phenylene diamine and from about 0.01 to 1 part per hundred of prepolymer of a catalyst selected from the group consisting of mono and dicarboxylic acids, metal salts of mono and dicarboxylic acids, carboxylic acid anhydrides, and tertiary amines.
Claim 10
Dependent Claim
96 words
A diamine curative system for polyurethane prepolymers having terminally reactive isocyanate groups, prepared by reaction of a polymeric diol with a stoichiometric excess of 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate or a mixture of tolylene diisocyanates containing a major proportion of the 2,4-isomer consisting essentially of from about 80 to 110% of the stoichiometrically required amount of 2,6-dichloro-p-phenylene diamine, 2,6-dibromo-p-phenylene diamine and from about 0.01 to 1 part per hundred of prepolymer of a catalyst selected from the group consisting of mono and dicarboxylic acids, metal salts of mono and dicarboxylic acids, carboxylic acid anhydrides, and tertiary amines.
Claim 11
Dependent Claim
13 words
A curative system according to claim 8 wherein the catalyst is stearic acid.
Claim 12
Dependent Claim
13 words
A curative system according to claim 8 wherein the catalyst is azaleic acid.
Claim 13
Dependent Claim
13 words
A curative system according to claim 8 wherein the catalyst is stannous octoate.
Claim 14
Dependent Claim
13 words
A curative system according to claim 8 wherein the catalyst is triethylene diamine.
Claim 15
Dependent Claim
21 words
A curative system according to claim 8 wherein there is additionally added from about 1% to 10% of a solubilizing agent.
Claim 16
Dependent Claim
18 words
A curative system according to claim 13 wherein the solubilizing agent is the dimethyl ether of tetraethylene glycol.
References Cited (Backward Citations)
US2939851A
Cited
US3462470A
Cited
US3580875A
Cited
US3660326A
Cited
US3629168A
Cited
USRE28541E
Cited
US3681291A
Cited
US3880809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |