Patent US3950285A successfully refreshed from Google Patents.
US3950285A
Expired / Lapsed
US
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Preparation of polymeric urethanes from dicarbamates
Assignee: Atlantic Richfield Co
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Filing: 1974-04-04
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Granted: 1976-04-13
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Expires: 1994-04-04
Abstract
Abstract Polyurethanes or polyester polyurethanes are prepared by reacting a polycarbamic acid ester or a mixture of a polycarbamic acid ester and a polycarboxylic acid ester with an organic polyol in the presence of an organotin and/or organotin alkoxide catalyst at a temperature of about 60° to 180° C. Storage stable thermally curable compositions of these compounds are also presented.
Inventors
- 👤 Larry G. Wolgemuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:33
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/8064; C08G18/08; C08G18/16; C08G18/22; C08G18/24; C08G18/28; C08G18/40; C08G18/42; C08G71/00; C08G71/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
An improved process for preparing polyester polyurethanes comprising transesterifying a mixture containing a. an organic dicarbamate, free of substituents which would interfere with the desired reaction, having the structural formula ##EQU2## wherein R is an organic radical containing 2 to 18 carbon atoms, R' and R" are the same or different organic radicals containing 1 to 12 carbon atoms and b. an organic dicarboxylic acid ester having a molecular weight of about 118 to 462, the esterifying alcohols of which contain 1 to 12 carbon atoms, with c. a dihydroxy organic compound having a molecular weight of about 64 to 2,000, said dicarbmate, dicarboxylic acid ester and dihydroxy organic compound being free of substituents which would interfere with the desired transesterification reaction, in the presence of about 0.005 to 5.0%, based on the total weight of reactants, of an organotin compound selected from the group consisting of organotin oxides, organo tin alkoxides, and tin salts of fatty acids at a temperature of about 60° to 180° C.
Claim 2
Dependent Claim
167 words
An improved process for preparing polyester polyurethanes comprising transesterifying a mixture containing a. an organic dicarbamate, free of substituents which would interfere with the desired reaction, having the structural formula ##EQU2## wherein R is an organic radical containing 2 to 18 carbon atoms, R' and R" are the same or different organic radicals containing 1 to 12 carbon atoms and b. an organic dicarboxylic acid ester having a molecular weight of about 118 to 462, the esterifying alcohols of which contain 1 to 12 carbon atoms, with c. a dihydroxy organic compound having a molecular weight of about 64 to 2,000, said dicarbmate, dicarboxylic acid ester and dihydroxy organic compound being free of substituents which would interfere with the desired transesterification reaction, in the presence of about 0.005 to 5.0%, based on the total weight of reactants, of an organotin compound selected from the group consisting of organotin oxides, organo tin alkoxides, and tin salts of fatty acids at a temperature of about 60° to 180° C.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein R is selected from aromatic radicals containing 6 to 18 carbon atoms and saturated aliphatic compounds containing 4 to 12 carbon atoms.
Claim 4
Dependent Claim
18 words
The proceess of claim 2 wherein R' and R" are alkyl groups containing 1 to 6 carbon atoms.
Claim 5
Dependent Claim
20 words
The process of claim 3 wherein the reaction is carried out at a temperature of less than about 150° C.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein said process is carried out in a inert organic solvent.
Claim 7
Dependent Claim
34 words
The process of claim 1 wherein the equivalent ratio of (a) to (b) varies between 1:9 and 9:1 and the equivalent ratio of total (a) and (b) to (c) varies from 0.7 to 10:1.
Claim 8
Dependent Claim
34 words
The process of claim 1 wherein the equivalent ratio of (a) to (b) varies between 75:25 and 25:75 and the equivalent ratio of total (a) and (b) to (c) varies from 0.7 to 1.4:1.
References Cited (Backward Citations)
US2683728A
Cited
US2855421A
Cited
US2797232A
Cited
US3240730A
Cited
GB944310A
Cited
US3676402A
Cited
GB1140534A
Cited
US3454621A
Cited
US3393177A
Cited
US3660359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |