US4467056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particulate agent for impeding the combustibility of combustible materials
Assignee: Hoechst AG
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Filing: 1980-12-08
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Granted: 1984-08-21
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Expires: 2000-12-08
Abstract
Abstract The invention relates to a particulate agent based on free-flowing pulverulent ammonium polyphosphates of the general formula H.sub.(n-m)+2 (NH.sub.4).sub.m P.sub.n O.sub.3n+1 in which n is an integer having an average value of from approximately 20 to 800 and the ratio of m to n is approximately 1, for impeding the combustibility of combustible materials. The agent is comprised of (a) approximately 75 to 99% by weight of ammonium polyphosphate, and (b) approximately 1 to 25% by weight of a hardened water-insoluble polycondensation product of melamine and formaldehyde encasing the individual ammonium polyphosphate particles.
Inventors
- 👤 Horst Staendeke
- 👤 Franz-Josef Dany
- 👤 Joachim Kandler
- 👤 Wilhelm Adam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:14
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/009; C08K; C08K9/00; C08K9/10; C09; C09K; C09K21/00; C09K21/06; C09K21/12; C09K21/14; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
84 words
Particulate agent based on free-flowing pulverulent ammonium polyphosphates of the general formula H.sub.(n-m)+2 (NH.sub.4).sub.m P.sub.n O.sub.3n+1 in which n is an integer having an average value of from approximately 20 to 800 and the ratio of m to n is approximately 1, for impeding the combustibility of combustible materials, comprising (a) approximately 75 to 99% by weight of ammonium polyphosphate; and (b) approximately 1 to 25% by weight of a hardened water-insoluble polycondensation product of melamine and formaldehyde encasing the individual ammonium polyphosphate particles.
Claim 2
Dependent Claim
84 words
Particulate agent based on free-flowing pulverulent ammonium polyphosphates of the general formula H.sub.(n-m)+2 (NH.sub.4).sub.m P.sub.n O.sub.3n+1 in which n is an integer having an average value of from approximately 20 to 800 and the ratio of m to n is approximately 1, for impeding the combustibility of combustible materials, comprising (a) approximately 75 to 99% by weight of ammonium polyphosphate; and (b) approximately 1 to 25% by weight of a hardened water-insoluble polycondensation product of melamine and formaldehyde encasing the individual ammonium polyphosphate particles.
Claim 3
Dependent Claim
20 words
Agent as claimed in claim 1, consisting of particles with a mean size of from approximately 0.01 to 0.05 mm.
Claim 4
Dependent Claim
20 words
Agent as claimed in claim 1, wherein n is an integer having an average value of from 100 to 500.
Claim 5
Dependent Claim
20 words
Agent as claimed in claim 1, containing the polycondensation product in a proportion of from 2.5 to 10% by weight.
Claim 6
Dependent Claim
17 words
Agent as claimed in claim 1, wherein the polycondensation product is a non-etherified or partially etherified product.
Claim 7
Dependent Claim
54 words
Agent as claimed in claim 1, wherein the polycondensation product in its unhardened state is a powder a 50% by weight aqueous solution of which has a dynamic viscosity of 20 mPa·s, a pH-value at 20° C. of from 8.8 to 9.8 and a density at 20° C. of from 1.21 to 1.225 (g/ml).
Claim 8
Dependent Claim
40 words
Agent as claimed in claim 1, for rendering polyurethanes and polyurethane foams flameproof, wherein the content of the agent in polyurethane foam is from approximately 5 to 50% by weight, based on the amount of alcoholic component in the polyurethane.
Claim 9
Dependent Claim
43 words
Agent as claimed in claim 1, consisting essentially of said encased particles, each encased particle consisting essentially of: a particle of said ammonium polyphosphate, and a coating encasing said particle and consisting essentially of the hardened, water-insoluble polycondensation product of melamine and formaldehyde.
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) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |