US4639331A
Expired / Lapsed
US
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Process for making pulverulent ammonium polyphosphates stable to hydrolysis
Assignee: Clariant Produkte Deutschland GmbH
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Filing: 1984-04-23
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Granted: 1987-01-27
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Expires: 2004-04-23
Abstract
Abstract The disclosure relates to a process for making a particulate agent stable to hydrolysis based on free-flowing, pulverulent ammonium polyphosphate by treating the ammonium polyphosphate with a thermosetting, artificial resin being water-insoluble when cured. More specifically, the disclosure provides for the ammonium polyphosphate, an aliphatic alcohol as a diluent, and a melamine/formaldehyde-resin or phenol/formaldehyde-resin to be placed in an autoclave and intimately mixed at room temperature; for the mixture to be heated to a temperature of about 80 DEG to about 180 DEG C. and allowed to remain over a period of 15 to 240 minutes at that temperature and under the pressure corresponding to the vapor pressure of the diluent; for the diluent to be separated and for the product so obtained to be dried.
Inventors
- 👤 Georg Elsner
- 👤 Horst Staendeke
- 👤 Gero Heymer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:13
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/38; C01B25/40; C01B25/405; C08; C08K; C08K3/00; C08K3/32; C08K9/00; C08K9/08; C08K9/10; C09; C09K; C09K21/00; C09K21/02; C09K21/06; C09K21/12; D; D21; D21H; D21H5/00; D21H5/0002; D21H21/00; D21H21/14; D21H21/34; Y; Y10; Y10S; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
Process for making a particulate, free-flowing, pulverulent ammonium polyphosphate of the general formula H.sub.(n-m)+2 (NH.sub.4).sub.m P.sub.n O.sub.3n+1 in which n stands for a whole number having an average value of about 20 to 800 and the m/n ratio is about 1, wherein 75 to 99 parts by weight ammonium polyphosphate are encapsulated with 1 to 25 parts by weight melamine/formaldehyde-resin or phenol/formaldehyde-resin, which comprises: placing particulate ammonium polyphosphate, an aliphatic C 1 -C 4 alcohol as a diluent, and melamine/formaldehyde-resin or phenol/formaldehyde-resin in an autoclave and initmately mixing them as a suspension at room temperature therein, heating the suspension to a temperature of 80° to 180° C., allowing the mixture to remain over a period of 15 to 240 minutes at that temperature, cooling the mixture to room temperature, separating the alcohol and dring the product so obtained.
Claim 2
Dependent Claim
138 words
Process for making a particulate, free-flowing, pulverulent ammonium polyphosphate of the general formula H.sub.(n-m)+2 (NH.sub.4).sub.m P.sub.n O.sub.3n+1 in which n stands for a whole number having an average value of about 20 to 800 and the m/n ratio is about 1, wherein 75 to 99 parts by weight ammonium polyphosphate are encapsulated with 1 to 25 parts by weight melamine/formaldehyde-resin or phenol/formaldehyde-resin, which comprises: placing particulate ammonium polyphosphate, an aliphatic C 1 -C 4 alcohol as a diluent, and melamine/formaldehyde-resin or phenol/formaldehyde-resin in an autoclave and initmately mixing them as a suspension at room temperature therein, heating the suspension to a temperature of 80° to 180° C., allowing the mixture to remain over a period of 15 to 240 minutes at that temperature, cooling the mixture to room temperature, separating the alcohol and dring the product so obtained.
Claim 3
Dependent Claim
95 words
Process as claimed in claim 1, which comprises: placing 1 part by weight particulate ammonium polyphosphate with 1.5 part by weight aliphatic C 1 -C 4 alcohol and 0.1 part by weight melamine/formaldehyde-resin or 0.1 part by weight phenol/formaldehyde-resin in an autoclave and intimately mixing them as a suspension at room temperature therein, heating the suspension to a temperature of 110° to 130° C., allowing the mixture to remain over a period of 15 to 240 minutes at that temperature, cooling the mixture to room temperature, separating the alcohol and drying the product so obtained.
Claim 4
Dependent Claim
19 words
Process as claimed in claim 1, wherein the mixture is heated to a temperature of 110° to 130° C.
Claim 5
Dependent Claim
19 words
Process as claimed in claim 1, wherein the mixture is cured over a period of 30 to 60 minutes.
Claim 6
Dependent Claim
23 words
Process as claimed in claim 1, wherein the finished agent consists of particles with a means size of about 0.01 to 0.05 mm.
Claim 7
Dependent Claim
22 words
Process as claimed in claim 1, wherein the ammonium polyphosphate, alcohol and resin component are used in a quantitative ratio of 1:1.5:0.1.
Claim 8
Dependent Claim
46 words
Process as claimed in claim 1, wherein the uncured melamine/formaldehyde-resin is a powder of which a 50% aqueous solution has a dynamic viscosity of 20 mPa.s, a pH-value at 20° C. of 8.8 to 9.8 and a density at 20° C. of 1.21 to 1.225 g/ml.
Claim 9
Dependent Claim
24 words
Process as claimed in claim 1, wherein the phenol resin is an alcohol-soluble, thermosetting, unplasticized phenol resin (phenol/formaldehyde resin) or a thermosetting phenol resin.
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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) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |