Patent US3926990A successfully refreshed from Google Patents.
US3926990A
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Process for preparing amide polyphosphates
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1973-10-15
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Granted: 1975-12-16
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Expires: 1993-10-15
Abstract
Abstract A process for preparing a substantially water insoluble amide polyphosphate which comprises heat-condensing together a phosphoric acid source as hereinafter defined and at least one cyanamide derivative as a nitrogen source in the presence of urea or urea phosphate or a mixture thereof as a condensing agent in a molar ratio of from 0.8 to 1.5 of urea and 0.05 to 1 of a cyanamide derivative per 1 mole of phosphoric acid at a temperature ranging from 150* to 350*C for a period sufficient to produce amide polyphosphates having a desired water insolubility is disclosed.
Inventors
- 👤 Kozo Fukuba
- 👤 Yasutomo Ogushi
- 👤 Minematsu Miyazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:43
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/667; C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/22; C08; C08G; C08G79/00; C08G79/02; C08L; C08L1/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
A PROCESS FOR PREPARING A SUBSTANTIALLY WATER INSOLUBLE AMIDE POLYPHOSPHATE WHICH COMPRISES HEAT-CONDENSING TOGETHER AT LEAST ONE PHOSPHORIC ACID SOURCE SELECTED FROM THE GROUP CONSISTING OF AMMONIUM ORTHOPHOSPHATE, UREA PHOSPHATE, MELAMINE PHOSPHATE, PHOSPHORIC ANHYDRIDE, POLYPHOSOPHORIC ACID AND ORTHOPHOPHORIC ACID AND AT LEAST ONE CYANAMIDE DERIVATIVE AS A NITROGEN SOURCE SELECTED FROM THE GROUP CONSISTING OF MELAMINE, DICYANADIAMIDE, GUANIDINE AND GUANYLUREA IN CONTACT WITH A CONDENSING AGENT SELECTED FROM THE GROUP CONSISTING OF UREA AND UREA PHOSPHATE AND A MIXTURE THEREOF IN A MOLAR RATIO OF UREA/PHOSPHORIC ACID (AS H3PO4)/ CYANAMIDE DERIVATIVE OF 0.8 TO 1.5/1/0.05 TO 1 AT A TEMPERATURE OF FROM 150* TO 350*C FOR A PERIOD SUFFICIENT TO PROVIDE THE DESIRED WATER INSOLUBILITY TO THE AMIDE POLYPHOSPHATE PRODUCT.
Claim 2
Dependent Claim
120 words
A PROCESS FOR PREPARING A SUBSTANTIALLY WATER INSOLUBLE AMIDE POLYPHOSPHATE WHICH COMPRISES HEAT-CONDENSING TOGETHER AT LEAST ONE PHOSPHORIC ACID SOURCE SELECTED FROM THE GROUP CONSISTING OF AMMONIUM ORTHOPHOSPHATE, UREA PHOSPHATE, MELAMINE PHOSPHATE, PHOSPHORIC ANHYDRIDE, POLYPHOSOPHORIC ACID AND ORTHOPHOPHORIC ACID AND AT LEAST ONE CYANAMIDE DERIVATIVE AS A NITROGEN SOURCE SELECTED FROM THE GROUP CONSISTING OF MELAMINE, DICYANADIAMIDE, GUANIDINE AND GUANYLUREA IN CONTACT WITH A CONDENSING AGENT SELECTED FROM THE GROUP CONSISTING OF UREA AND UREA PHOSPHATE AND A MIXTURE THEREOF IN A MOLAR RATIO OF UREA/PHOSPHORIC ACID (AS H3PO4)/ CYANAMIDE DERIVATIVE OF 0.8 TO 1.5/1/0.05 TO 1 AT A TEMPERATURE OF FROM 150* TO 350*C FOR A PERIOD SUFFICIENT TO PROVIDE THE DESIRED WATER INSOLUBILITY TO THE AMIDE POLYPHOSPHATE PRODUCT.
Claim 3
Dependent Claim
62 words
A process according to claim 1 wherein said heat-condensation is carried out in two steps, the first step being conducted at a temperature ranging from 150* to 350*C for a period of from 10 minutes to 5 hours and the second step being conducted at a temperature ranging from 180* to 350*C for a period of from 10 minutes to 5 hours.
Claim 4
Dependent Claim
26 words
A process according to claim 2 wherein the product obtained in the first condensation step is ground before subjecting said product to the second condensation step.
Claim 5
Dependent Claim
18 words
A process according to claim 1 wherein said heat-condensation is carried out under a partial pressure of ammonia.
Claim 6
Dependent Claim
17 words
A process according to claim 4 wherein said partial pressure of ammonia is more than 300 mmHg.
Claim 7
Dependent Claim
39 words
A process according to claim 1 wherein said cyanamide derivative is introduced into a reaction system containing said phosphoric acid source and said condensing agent in the last half period of the first condensation step or the griding step.
References Cited (Backward Citations)
US3300395A
Cited
US3635970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |