US4347334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particulate agent for impeding the combustibility of combustible substances
Assignee: Hoechst AG
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Filing: 1981-02-04
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Granted: 1982-08-31
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Expires: 2001-02-04
Abstract
Abstract The invention relates to a particulate agent based on a free-flowing pulverulent ammonium polyphosphate for impeding the combustibility of combustible substances, the agent containing (a) about 75 to 99.9 weight % of ammonium polyphosphate and (b) about 0.1 to 25 weight % of a hardened, water-insoluble phenol resin (phenol/formaldehyde-resin) enveloping the individual ammonium polyphosphate particles.
Inventors
- 👤 Horst Staendeke
- 👤 Franz-Josef Dany
- 👤 Joachim Kandler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:34
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
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
Particulate agent, for impeding the combustibility of combustible substances, based on a 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 with an average value of about 20 to 800 and the ratio m/n is about 1, and a phenol resin, the agent containing: (a) about 75 to 99.9 weight % of the free-flowing pulverulent ammonium polyphosphate, and (b) about 0.1 to 25 weight % of a hardened, water-insoluble phenol resin enveloping the individual ammonium polyphosphate particles.
Claim 2
Dependent Claim
88 words
Particulate agent, for impeding the combustibility of combustible substances, based on a 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 with an average value of about 20 to 800 and the ratio m/n is about 1, and a phenol resin, the agent containing: (a) about 75 to 99.9 weight % of the free-flowing pulverulent ammonium polyphosphate, and (b) about 0.1 to 25 weight % of a hardened, water-insoluble phenol resin enveloping the individual ammonium polyphosphate particles.
Claim 3
Dependent Claim
21 words
Agent as claimed in claim 1, consisting essentially of particles having an average particle size of about 0.01 to 0.05 mm.
Claim 4
Dependent Claim
20 words
Agent as claimed in claim 1, wherein n is a whole number with an average value of 450 to 800.
Claim 5
Dependent Claim
19 words
Agent as claimed in claim 1, containing the phenol resin in a proportion of 0.1 to 10 weight %.
Claim 6
Dependent Claim
14 words
Agent as claimed in claim 1, wherein the phenol resin is a phenol/formaldehyde resin.
Claim 7
Dependent Claim
27 words
Agent has claimed in claim 1, wherein the phenol resin is an alcohol-soluble, hardenable non-plasticized phenol/formaldehyde resin which has been heat-set after said particles have been enveloped.
Claim 8
Dependent Claim
26 words
Agent as claimed in claim 1 or 6, wherein the phenol resin is a thermosetting resole which has been heat-set after said particles have been enveloped.
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) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |