US4481308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pretreatment method of producing fire retardant foam
Assignee: Anti-Fire Foam Inc
•
Filing: 1983-05-03
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Granted: 1984-11-06
•
Expires: 2003-05-03
Abstract
Abstract A method for the production of fire retardant foam such as flexible polyurethane foam. The method includes the mixing of urea with one or more of the foam producing reactants prior to combining or at the time of combining such reactants to produce the foam material. In one embodiment, the urea is pre-mixed with the polyol reactant in a slurry apparatus. In another embodiment, urea is injected into a mixing head at the time of mixing the foam producing reactants. The urea component may be employed in amounts of about 30 to 45% by weight of the total foam mass composition.
Inventors
- 👤 Stanley D. Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:40
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3829; Y; Y10; Y10S; Y10S521/00; Y10S521/906; Y10S521/917
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
42 words
A method of producing a fire retardant flexible polyurethane foam material which comprises mixing urea with at least one of the foam producing reactants prior to combining or at the time of combining such reactants to produce the flexible polyurethane foam material.
Claim 2
Independent Claim
42 words
A method of producing a fire retardant flexible polyurethane foam material which comprises mixing urea with at least one of the foam producing reactants prior to combining or at the time of combining such reactants to produce the flexible polyurethane foam material.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein urea is pre-mixed with a polyol reactant in a slurry.
Claim 4
Dependent Claim
32 words
The method of claim 1 wherein urea is injected into a mixing head in the form of solid granules at the time of mixing the foam producing reactants in the mixing head.
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein urea is employed in an amount of about 30 to 45% by weight of the total foam mass composition.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein urea is added in the form of solid granules.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein the foam material is polyurethane foam.
Claim 8
Dependent Claim
12 words
The fire retardant foam material produced by the method of claim 4.
Claim 9
Dependent Claim
63 words
The method of claim 3 which includes: (a) passing the urea in the form of solid granules into a screw chamber having a screw conveyor operating at 2500 to 9000 rpm; and (b) passing the urea from the screw chamber into the mixing head, the dispensing of the urea being synchronized with the dispensing of the foam producing reactants into the mixing head.
Claim 10
Dependent Claim
23 words
The method of claim 8 wherein a polyol is employed as a foam producing reactant, said polyol being primarily capped with ethylene oxide.
Claim 11
Dependent Claim
21 words
The method of claim 2 wherein said polyol includes a high molecular weight ethylene oxide capped polyol containing primary hydroxyl groups.
Claim 12
Dependent Claim
27 words
The method of claim 10 wherein said high molecular weight polyol is employed in an amount of at least 40 weight % of the total polyol reactant.
Claim 13
Dependent Claim
18 words
The method of claim 10 wherein said high molecular weight polyol has a molecular weight of about 4500.
Claim 14
Dependent Claim
14 words
The method of claim 1 wherein a chlorinated solvent is added to said mixture.
Claim 15
Dependent Claim
13 words
The method of claim 1 wherein a plasticizer is added to said mixture.
Claim 16
Dependent Claim
24 words
The method of claim 1 further including the step of heating the mixture of urea and foam producing reactants to form the foam material.
Claim 17
Dependent Claim
22 words
The method of claim 1 wherein said urea is coated with sulfur prior to mixing the urea with the foam producing reactants.
Claim 18
Dependent Claim
12 words
The fire retardant foam material produced by the method of claim 16.
Claim 19
Dependent Claim
14 words
The fire retardant flexible polyurethane foam material produced by the method of claim 3.
References Cited (Backward Citations)
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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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |