US2729618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isocyanate-modified polyesters reacted with glycols
Assignee: Bayer AG
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Filing: 1952-11-18
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Granted: 1956-01-03
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Expires: 1972-11-18
Abstract
No abstract record available.
Inventors
- 👤 Muller Karl Erwin
- 👤 Schmidt Friedrich Wilhelm
- 👤 Weinbrenner Erwin
- 👤 Ursula B Piepenbrink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:31
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7678; C08G18/08; C08G18/089; C08G18/10; C08G18/28; C08G18/67; C08G18/675; C08G18/679; Y; Y10; Y10S; Y10S138/00; Y10S138/07; Y10S138/09; Y10S264/00; Y10S264/77; Y10S273/00; Y10S273/08; Y10S528/00; Y10S528/903; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
THE PROCESS WHICH COMPRISES REACTING AN ANHYDROUS ORGANIC, LINEAR POLYESTER HAVING FROM 0.6 TO 2.4 PER CENT BY WEIGHT OF HYDROXYL GROUPS AND AN ACID VALUE SUBSTANTIALLY NOT EXCEEDING 1, SAID POLYESTER BEING MADE FROM AN ALIPHATIC POLYMETHYLENE DICARBOXYLIC ACID AND A POLYMETHYLENE GLYCOL, ARE ISOCYANATE DIISOCYANATE WHOSE SOLE REACTIVE GROUPS ARE ISOCYANATE GROUPS, IN AN EXCESS OF FROM 20 TO 250 PER CENT OVER THE AMOUNT WHICH IS NECESSARY TO COMBINE WITH SAID HYDROXYL GROUPS AND THEN REACTING THE ISOCYANATE MODIFIED POLYESTER THUS FORMED WITH A COMPOUND OF THE GENERAL FORMULA R(OH)2 HAVING A MOLECULAR WEIGHT NOT EXCEEDING 800, WHEREIN R IS A RADICAL SELECTED FROM THE GROUP CONSISTING OF A DIVALENT HYDROCARBON RADICAL AND A DIVALENT IN WHICH THE CARBON CHAIN IS INTERRUPTED BY A MEMBER OF THE GROUP CONSISTING OF -O-, -N-, -S-, -SO2 IN SUCH A PROPORTION, THAT THE EXCESS OF ISOCYANATE GROUPS THEREIN IS REDUCED TO AT MOST ZERO.
Claim 2
Dependent Claim
154 words
THE PROCESS WHICH COMPRISES REACTING AN ANHYDROUS ORGANIC, LINEAR POLYESTER HAVING FROM 0.6 TO 2.4 PER CENT BY WEIGHT OF HYDROXYL GROUPS AND AN ACID VALUE SUBSTANTIALLY NOT EXCEEDING 1, SAID POLYESTER BEING MADE FROM AN ALIPHATIC POLYMETHYLENE DICARBOXYLIC ACID AND A POLYMETHYLENE GLYCOL, ARE ISOCYANATE DIISOCYANATE WHOSE SOLE REACTIVE GROUPS ARE ISOCYANATE GROUPS, IN AN EXCESS OF FROM 20 TO 250 PER CENT OVER THE AMOUNT WHICH IS NECESSARY TO COMBINE WITH SAID HYDROXYL GROUPS AND THEN REACTING THE ISOCYANATE MODIFIED POLYESTER THUS FORMED WITH A COMPOUND OF THE GENERAL FORMULA R(OH)2 HAVING A MOLECULAR WEIGHT NOT EXCEEDING 800, WHEREIN R IS A RADICAL SELECTED FROM THE GROUP CONSISTING OF A DIVALENT HYDROCARBON RADICAL AND A DIVALENT IN WHICH THE CARBON CHAIN IS INTERRUPTED BY A MEMBER OF THE GROUP CONSISTING OF -O-, -N-, -S-, -SO2 IN SUCH A PROPORTION, THAT THE EXCESS OF ISOCYANATE GROUPS THEREIN IS REDUCED TO AT MOST ZERO.
References Cited (Backward Citations)
US2621166A
Cited
US2620516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |