US3300490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of crystalline triglycidyl isocyanurate
Assignee: Henkel AG and Co KGaA
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Filing: 1965-06-25
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Granted: 1967-01-24
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Expires: 1985-06-25
Abstract
No abstract record available.
Inventors
- 👤 Budnowski Manfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:09
CPC Classifications
C; C07; C07D; C07D405/00; C07D405/14; C07D405/02; C07D405/06; C08; C08G; C08G59/00; C08G59/18; C08L; C08L63/00; C09; C09D; C09D163/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
IN THE PROCESS FOR THE PREPARATION OF CRYSTALLINE TRIGLYCIDYL ISOCYANURATE BY THE STEPS OF: (A) REACTING ABOUT 1 MOL OF CYANURIC ACID WITH FROM ABOUT 3 TO ABOUT 15 MOLS OF EPICHLOROHYDRIN IN THE PRESENCE OF A CATALYST AT ELEVATED TEMPERATURES, TO PRODUCE A CHLOROHYDRIN ESTER, (B) DEHYDROHALOGENATING THE CHLOROHYDRIN ESTER OBTAINED BY THE ACTION OF AN ALKALINE REACTNG COMPOUND, (C) ADMIXING THE DEHYDROHALOGENATED PRODUCT WITH A CRYSTALLIZATION SOLVENT SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHYLENE GLYCOL MONOMETHYL ETHER AND ETHYLENE GLYCOL MONOETHYL ETHER; AND (D) SEPARATING AND RECOVERING SAID CRYSTALLINE TRIGLYCIDYL ISOCYANURATE FROM THE CRYSTALLIZATION MOTHER LIQUOR, THE IMPROVEMENT WHICH COMPRISES UTILIZING AS SAID CATALYST IN STEP (A) AT LEAST 50% OF THE MOTHER LIQUOR FROM A PREVIOUS CRYSTALLIZATION STEP (D) AND CONDUCTING SAID DEHYDROHALOGENATING STEP (B) AT A PH OF BELOW ABOUT 13 FOR THE DEHYDROHALOGENATING MIXTURE.
Claim 2
Dependent Claim
140 words
IN THE PROCESS FOR THE PREPARATION OF CRYSTALLINE TRIGLYCIDYL ISOCYANURATE BY THE STEPS OF: (A) REACTING ABOUT 1 MOL OF CYANURIC ACID WITH FROM ABOUT 3 TO ABOUT 15 MOLS OF EPICHLOROHYDRIN IN THE PRESENCE OF A CATALYST AT ELEVATED TEMPERATURES, TO PRODUCE A CHLOROHYDRIN ESTER, (B) DEHYDROHALOGENATING THE CHLOROHYDRIN ESTER OBTAINED BY THE ACTION OF AN ALKALINE REACTNG COMPOUND, (C) ADMIXING THE DEHYDROHALOGENATED PRODUCT WITH A CRYSTALLIZATION SOLVENT SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHYLENE GLYCOL MONOMETHYL ETHER AND ETHYLENE GLYCOL MONOETHYL ETHER; AND (D) SEPARATING AND RECOVERING SAID CRYSTALLINE TRIGLYCIDYL ISOCYANURATE FROM THE CRYSTALLIZATION MOTHER LIQUOR, THE IMPROVEMENT WHICH COMPRISES UTILIZING AS SAID CATALYST IN STEP (A) AT LEAST 50% OF THE MOTHER LIQUOR FROM A PREVIOUS CRYSTALLIZATION STEP (D) AND CONDUCTING SAID DEHYDROHALOGENATING STEP (B) AT A PH OF BELOW ABOUT 13 FOR THE DEHYDROHALOGENATING MIXTURE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |