Patent US3874889A successfully refreshed from Google Patents.
US3874889A
Expired / Lapsed
US
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Fire retardant composition
Assignee: Alcoa Corp
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Filing: 1973-06-13
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Granted: 1975-04-01
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Expires: 1993-06-13
Abstract
Abstract A fire-retardant foamable latex carpet backing can be produced using large particles of alpha alumina-trihydrate which have been ground to a median particle size of about 6-35 microns and subsequently treated with sufficient water at a sufficient temperature and for a sufficient time to prevent collapse of the subsequent fire-retardant foam latex.
Inventors
- 👤 Gerard A Geppert
- 👤 Robert Dale Woosley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:25
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/40; C09C1/407; C08; C08J; C08J9/00; C08J9/0066; C08K; C08K3/00; C08K3/10; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/80; C01P2006/82; Y; Y10; Y10S; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
A PROCESS FOR RENDERING COARSE ALPHA ALUMINA TRIHYDRATE PARTICLES COMPATIBLE WITH FOAMABLE LATICES TO PRODUCE FIRERETARDANT PRODUCTS COMPRISING A. GRINDING THE COARSE PARTICLES TO A MEDIAN PARTICLE SIZE OF ABOUT 6-35 MICRONS WITH LESS THAN ABOUT 5 PERCENT OF SAID PARTICLES OVER 74 MICRONS; AND B. CONTACTING THE SURFACES OF THE GROUND PARTICLES WITH LIQUID WATER AT A TEMPERATURE OF ABOUT 20*C TO ABOUT 100*C OR STEAM AT ABOUT 100*C TO PROVIDE A MOISTURE CONTENT OF AT LEAST ABOUT 0.25 BUT LESS THAN 1 PERCENT BY TOTAL WEIGHT OF THE HYDRATE TO PROVIDE A TREATED YET FREELY FLOWING COMMINUTED ALUMINA HYDRATE YET PREVENT COLLAPSE OF A FIRERETARDANT FOAM LATEX MADE USING SAID TRIHYDRATE.
Claim 2
Dependent Claim
113 words
A PROCESS FOR RENDERING COARSE ALPHA ALUMINA TRIHYDRATE PARTICLES COMPATIBLE WITH FOAMABLE LATICES TO PRODUCE FIRERETARDANT PRODUCTS COMPRISING A. GRINDING THE COARSE PARTICLES TO A MEDIAN PARTICLE SIZE OF ABOUT 6-35 MICRONS WITH LESS THAN ABOUT 5 PERCENT OF SAID PARTICLES OVER 74 MICRONS; AND B. CONTACTING THE SURFACES OF THE GROUND PARTICLES WITH LIQUID WATER AT A TEMPERATURE OF ABOUT 20*C TO ABOUT 100*C OR STEAM AT ABOUT 100*C TO PROVIDE A MOISTURE CONTENT OF AT LEAST ABOUT 0.25 BUT LESS THAN 1 PERCENT BY TOTAL WEIGHT OF THE HYDRATE TO PROVIDE A TREATED YET FREELY FLOWING COMMINUTED ALUMINA HYDRATE YET PREVENT COLLAPSE OF A FIRERETARDANT FOAM LATEX MADE USING SAID TRIHYDRATE.
Claim 3
Dependent Claim
44 words
The process of claim 1 wherein said particles are contacted with steam at about 100*C for a time period of from about 0.1 to about 5 minutes to provide a moisture content in the hydrate of at least about 0.25 percent by total weight.
Claim 4
Dependent Claim
26 words
The process of claim 2 wherein said moisture content after grinding and contacting with steam is from about 0.25 to about 0.5 percent by total weight.
Claim 5
Dependent Claim
15 words
The process of claim 2 wherein said contact time is at least about 0.4 minutes.
Claim 6
Dependent Claim
67 words
Finely divided ground alpha alumina trihydrate particles compatible with foamable latices to produce fire-resistant compositions ground to a median particle size of about 6-35 microns with less than about 5 percent of the particles over 74 microns and treated with water at 20*C to 100*C or steam at 100*C to provide a moisture content of at least 0.25 percent but less than 1 percent by total weight.
Claim 7
Dependent Claim
67 words
Finely divided ground alpha alumina trihydrate particles compatible with foamable latices to produce fire-resistant compositions ground to a median particle size of about 6-35 microns with less than about 5 percent of the particles over 74 microns and treated with water at 20*C to 100*C or steam at 100*C to provide a moisture content of at least 0.25 percent but less than 1 percent by total weight.
Claim 8
Dependent Claim
65 words
A ground alumina-trihydrate treated with an aqueous material consisting of water at 20*C to 100*C at 100*C subsequent to grinding to render it compatible with foamable latices including: a curable latex, an accelerator; and a gelling agent, said ground alumina-trihydrate comprising finely divided particles having a median particle size of about 6-35 microns with less than about 5 percent of the particles over 74 microns.
Claim 9
Dependent Claim
65 words
A ground alumina-trihydrate treated with an aqueous material consisting of water at 20*C to 100*C at 100*C subsequent to grinding to render it compatible with foamable latices including: a curable latex, an accelerator; and a gelling agent, said ground alumina-trihydrate comprising finely divided particles having a median particle size of about 6-35 microns with less than about 5 percent of the particles over 74 microns.
Claim 10
Dependent Claim
28 words
The composition of claim 4 wherein said ground alumina-trihydrate particles have a moisture content of at least 0.25 percent but less than about 1 percent by total weight.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |