Patent US1740743A successfully refreshed from Google Patents.
Patent US3666726A successfully refreshed from Google Patents.
US3666726A
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Polymers which contain polyamide, urea and/or urethane groups and process for preparing same
Assignee: Bayer AG
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Filing: 1970-07-02
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Granted: 1972-05-30
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Expires: 1990-07-02
Abstract
Abstract Polymers containing polyamide, urea and/or urethane groups are obtained by a process which comprises the polyaddition of aliphatic or aromatic polyisocyanates with polyfunctional aminocrotonic acid esters, the substitutents of which on the nitrogen containing additional hydroxyl or amino groups.
Inventors
- 👤 Gerhard Grogler
- 👤 Gunter Oertel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:12
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/6795; C08G18/675; C08G65/00; C08G65/02; C08G65/32; C08G65/329; C08G65/331; C08G65/332; C08G65/3324; C08G69/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A process for the preparation of polymers with a molecular weight of from 500 to 100,000 containing polyamide, urea and/or urethane groups, which comprises reacting a polyfunctional aminocrotonic acid ester of the general formula in which R represents a radical selected from the group consisting of an alkyl, a cycloalkyl, an aralkyl and an aryl radical said radicals containing one or more hydroxyl or amino groups, A represents the radical of a polyol without the OH groups and having a functionality of n, and n represents an integer of from 2 to 6, with an organic polyisocyanate at a temperature of from 80* to 100* C.
Claim 2
Dependent Claim
29 words
The process of claim 2 in which the proportion of -NCO groups to active hydrogen atoms in said aminocrotonic acid ester is in the range of 1 to 2.
Claim 3
Dependent Claim
19 words
The process of claim 2 in which an additional compound containing active hydrogen atoms is present in the reaction.
Claim 4
Dependent Claim
36 words
The polymer of claim 1 in which A is a polyfunctional radical of a polyol selected from the group consisting of polyethers and polyesters having a molecular weight of 300 to 3,000 without the -OH groups.
Claim 5
Dependent Claim
25 words
The polymer of claim 1 in which A is the polyfunctional radical of a polyol comprising an organoSiloxane-alkylene oxide block polymer, without the -OH groups.
Claim 6
Dependent Claim
36 words
The process of claim 2 in which A is a polyfunctional radical of a polyol selected from the group consisting of polyethers and polyesters having a molecular weight of 300 to 3,000, without the -OH groups.
Claim 7
Dependent Claim
25 words
The process of claim 2 in which A is the polyfunctional radical of a polyol comprising an organosiloxane-alkylene oxide block polymer, without the -OH groups.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |