Patent US4746682A successfully refreshed from Google Patents.
US4746682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane flame retardant
Assignee: FMC Corp
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Filing: 1987-04-01
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Granted: 1988-05-24
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Expires: 2007-04-01
Abstract
Abstract A liquid composition is provided suitable for use as a flame retardant additive for polyurethane foams. The composition overcomes the problems of high viscosity and precipitates forming in formulations of phosphate esters and polybromodiphenyl oxides and avoids scorch and smoldering while preparing polyurethane foams meeting the California 117 standard. In addition, the composition provides an unexpected advantage of improved efficacy and heat stability. The process for preparing the flame retarded polyurethane foam and the foam itself are also claimed.
Inventors
- 👤 Joseph Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:55
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/06; C08K5/49; C08K5/51; C08K5/52; C08K5/521; C08K5/523
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
55 words
A liquid composition suitable as a flame retardant additive for a polyurethane foam consisting essentially of a polybrominated diphenyl oxide and an alkylated triaryl phosphate ester, the polybrominated diphenyl oxide and triaryl phosphate being provided in sufficient quantity to provide about 0.7 to 4 parts by weight bromine per part by weight of triaryl phosphate.
Claim 2
Dependent Claim
55 words
A liquid composition suitable as a flame retardant additive for a polyurethane foam consisting essentially of a polybrominated diphenyl oxide and an alkylated triaryl phosphate ester, the polybrominated diphenyl oxide and triaryl phosphate being provided in sufficient quantity to provide about 0.7 to 4 parts by weight bromine per part by weight of triaryl phosphate.
Claim 3
Dependent Claim
25 words
The composition of claim 1 wherein said triaryl phosphate ester is an alkylated triphenyl phosphate having an average molecular weight of between 330 and 450.
Claim 4
Dependent Claim
13 words
The composition of claim 1 wherein the polybrominated diphenyl oxide is pentabromodiphenyl oxide.
Claim 5
Dependent Claim
13 words
The composition of claim 2 wherein the polybrominated diphenyl oxide is pentabromodiphenyl oxide.
Claim 6
Dependent Claim
25 words
The composition of claim 1 wherein said triaryl phosphate ester is an alkylated triphenyl phosphate having an average molecular weight of between 360 and 380.
Claim 7
Dependent Claim
25 words
A method for producing a flame retardant polyurethane by incorporating at least 14 php of the composition of claim 1 into an isocyanate-polyol reaction mixture.
Claim 8
Dependent Claim
31 words
A flame retardant polyurethane foam comprising at least 10 parts by weight pentabromodiphenyl oxide and at least 2 parts by weight of a triaryl phosphate per hundred parts by weight polyol.
Claim 9
Dependent Claim
31 words
A flame retardant polyurethane foam comprising at least 10 parts by weight pentabromodiphenyl oxide and at least 2 parts by weight of a triaryl phosphate per hundred parts by weight polyol.
References Cited (Backward Citations)
US4565833A
Cited
US4433071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |