Patent US4097400A successfully refreshed from Google Patents.
US4097400A
Expired / Lapsed
US
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Flameproof polyurethanes
Assignee: Hoechst AG
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Filing: 1976-04-09
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Granted: 1978-06-27
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Expires: 1996-04-09
Abstract
Abstract Production of flameproof polyurethanes or polyurethane foams containing an ammonium polyphosphate of the general formula:
Inventors
- 👤 Joachim Wortmann
- 👤 Franz-Josef Dany
- 👤 Joachim Kandler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:40
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08K; C08K3/00; C08K3/32; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/906
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
81 words
A homogenized mixture for the production of flameproof polyurethanes or polyurethane foams by reacting the said mixture with polyisocyanates, the said mixture containing a polyhydroxyl compound of high molecular weight, water, a catalyst, surfactants and ammoniumpolyphosphate as flameproofing substance, the ammonium polyphosphate having 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 averaging a numerical value of between about 600 to about 800, and the ratio of m : n being approximately 1 : 1.
Claim 2
Dependent Claim
81 words
A homogenized mixture for the production of flameproof polyurethanes or polyurethane foams by reacting the said mixture with polyisocyanates, the said mixture containing a polyhydroxyl compound of high molecular weight, water, a catalyst, surfactants and ammoniumpolyphosphate as flameproofing substance, the ammonium polyphosphate having 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 averaging a numerical value of between about 600 to about 800, and the ratio of m : n being approximately 1 : 1.
Claim 3
Dependent Claim
48 words
Mixture as claimed in claim 1, containing an ammonium polyphosphate prepared by heating approximately equimolecular proportions of ammonium orthophosphate and phosphorus pentoxide to temperatures between 170° and 350° C in the presence of gaseous ammonia while continually and simultaneously mixing, kneading and comminuting the material to undergo reaction.
References Cited (Backward Citations)
US3795637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |