Patent US2702200A successfully refreshed from Google Patents.
US3192186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chain extended polyether prepolymer polyurethane castings
Assignee: Bayer AG
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Filing: 1960-04-06
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Granted: 1965-06-29
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Expires: 1980-04-06
Abstract
No abstract record available.
Inventors
- 👤 Muller Erwin
- 👤 Schmidt Karl-Ludwig
- 👤 Schultheis Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:09
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
217 words
A METHOD OF MAKING A LIQUID POLYURETHANE CASTING COMPOSITION WHICH COMPRISES REACTING A POLYALKYLENE ETHER GLYCOL, THE ALKYLENE PORTION OF WHICH CONTAINS FROM TWO TO FOUR CARBON ATOMS, SAID POLYALKYLENE ETHER GLYCOL HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 750 AND A HYDROXYL NUMBER OF FROM ABOUT 40 TO ABOUT 150 WITH AN ORGANIC DIISOCYANATE, THE MOLAR RATIO OF SAID POLYALKYLENE ETHER GLYCOL TO ORGANIC DIISOCYANATE BEING FROM ABOUT 1/1.5 TO ABOUT 1/2 TO PREPARE AN NCO TERMINATED POLYETHER URETHANE, REACTING SAID POLYETHER URETHANE WITH A QUANTITY OF A GLYCOL HAVING A MOLECULAR WEIGHT LESS THAN ABOUT 500 SUCH THAT FROM ABOUT 1.8 TO 2 EQUIVALENTS OF GLYCOL ARE PRESENT FOR EACH NCO GROUP TO PROVIDE AN INTERMEDIATE HAVING TERMINAL HYDROXYL GROUPS, A MOLECULAR WEIGHT GREATER THAN ABOUT 1000 AND A HYDROXYL NUMBER OF FROM ABOUT 35 TO ABOUT 120, REACTING THIS INTERMEDIATE WITH AN EXCESS OF FROM ABOUT 20 MOL PERCENT TO ABOUT 300 MOL PERCENT OF AN ORGANIC DIISOCYANATE AND MIXING THE NCO TERMINATED POLYMER THUS FORMED WITH A CHAIN EXTENDING AGENT CONTAINING ACTIVE HYDROGEN CONTAINING GROUPS IN THE MOLECULE AS DETERMINED BY THE ZEREWITINOFF TEST, WHICH GROUPS ARE REACTIVE WITH NCO GROUPS, SAID CHAIN EXTENDING AGENT BEING PRESENT IN AN AMOUNT SUCH THAT FROM ABOUT 0.3% TO ABOUT 1% NCO GROUPS ARE PRESENT
Claim 2
Independent Claim
217 words
A METHOD OF MAKING A LIQUID POLYURETHANE CASTING COMPOSITION WHICH COMPRISES REACTING A POLYALKYLENE ETHER GLYCOL, THE ALKYLENE PORTION OF WHICH CONTAINS FROM TWO TO FOUR CARBON ATOMS, SAID POLYALKYLENE ETHER GLYCOL HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 750 AND A HYDROXYL NUMBER OF FROM ABOUT 40 TO ABOUT 150 WITH AN ORGANIC DIISOCYANATE, THE MOLAR RATIO OF SAID POLYALKYLENE ETHER GLYCOL TO ORGANIC DIISOCYANATE BEING FROM ABOUT 1/1.5 TO ABOUT 1/2 TO PREPARE AN NCO TERMINATED POLYETHER URETHANE, REACTING SAID POLYETHER URETHANE WITH A QUANTITY OF A GLYCOL HAVING A MOLECULAR WEIGHT LESS THAN ABOUT 500 SUCH THAT FROM ABOUT 1.8 TO 2 EQUIVALENTS OF GLYCOL ARE PRESENT FOR EACH NCO GROUP TO PROVIDE AN INTERMEDIATE HAVING TERMINAL HYDROXYL GROUPS, A MOLECULAR WEIGHT GREATER THAN ABOUT 1000 AND A HYDROXYL NUMBER OF FROM ABOUT 35 TO ABOUT 120, REACTING THIS INTERMEDIATE WITH AN EXCESS OF FROM ABOUT 20 MOL PERCENT TO ABOUT 300 MOL PERCENT OF AN ORGANIC DIISOCYANATE AND MIXING THE NCO TERMINATED POLYMER THUS FORMED WITH A CHAIN EXTENDING AGENT CONTAINING ACTIVE HYDROGEN CONTAINING GROUPS IN THE MOLECULE AS DETERMINED BY THE ZEREWITINOFF TEST, WHICH GROUPS ARE REACTIVE WITH NCO GROUPS, SAID CHAIN EXTENDING AGENT BEING PRESENT IN AN AMOUNT SUCH THAT FROM ABOUT 0.3% TO ABOUT 1% NCO GROUPS ARE PRESENT
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) | 1968-06-28 | 1968-12-28 | 1969-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-28 | 1972-12-28 | 1973-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-28 | 1976-12-28 | 1977-06-29 | $7700.00 | Window Closed / Lapsed |