US4275171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing flame retardant flexible polyurethane foams with blends of dibromoneopentyl glycol and flame retardant plasticizer
Assignee: Foamex LP
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Filing: 1979-04-12
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Granted: 1981-06-23
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Expires: 1999-04-12
Abstract
Abstract This invention is directed to a process for producing flame retardant flexible polyurethane foams having a porosity in the range between 0.5 and 10 cubic feet per minute. A polyol having an average molecular weight between about 250 and about 6,500 is reacted with toluene diisocyanate which comprises a mixture of the isomers of 2,4- and 2,6- toluene diisocyanate. The concentration of 2,4- toluene diisocyanate isomer is not critical. The formulation of the present invention includes a flame retardant mixture of a plasticizer and dibromoneopentyl glycol. The plasticizer is either a halogenated phosphonate or halogenated phosphate ester. Chlorine is the preferred halogen atom. The weight ratio of those ingredients is between about 50/50 and about 90/10 with the ratio 85/15 preferred. The concentration of that mixture is from about 1 to about 20 percent by weight of the polyol. Other ingredients that can be included in this formulation are water, a silicone surfactant, a tertiary amine catalyst, a tertiary amine co-catalyst, an auxiliary blowing agent and a tin catalyst. This process results in foam products that are flame retardant and suitable for automotive and furniture applications.
Inventors
- 👤 Gunter H. Wegner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:07
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0038; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3802; C08G18/3804; C08G18/3806; C08G18/381; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
128 words
In a process for producing flexible polyether or polyester polyurethane foams having a porosity in the range from about 0.5 to about 10 cubic feet per minute, in which an isomeric mixture of 2,4- and 2,6- toluene diisocyanate is reacted with a polyol in the presence of a small amount of water and a catalytic amount of polymerization catalyst, the improvement which comprises: incorporating as a separate reactant into the reaction mixture prior to polymerization from about 1 to about 20 percent by weight of a mixture of dibromoneopentyl glycol and flame retardant plasticizer based on the weight of the polyol used in the polymerization reaction, which manner of incorporating said mixture results in substantially more flame retardant foams without adversely affecting the physical characteristics of said foams.
Claim 2
Dependent Claim
128 words
In a process for producing flexible polyether or polyester polyurethane foams having a porosity in the range from about 0.5 to about 10 cubic feet per minute, in which an isomeric mixture of 2,4- and 2,6- toluene diisocyanate is reacted with a polyol in the presence of a small amount of water and a catalytic amount of polymerization catalyst, the improvement which comprises: incorporating as a separate reactant into the reaction mixture prior to polymerization from about 1 to about 20 percent by weight of a mixture of dibromoneopentyl glycol and flame retardant plasticizer based on the weight of the polyol used in the polymerization reaction, which manner of incorporating said mixture results in substantially more flame retardant foams without adversely affecting the physical characteristics of said foams.
Claim 3
Dependent Claim
37 words
The process for producing flame retardant flexible polyurethane foams according to claim 1, in which the polyol is a poly(propylene oxide/ethylene oxide) triol having an average molecular weight in the range from about 250 to about 6,500.
Claim 4
Dependent Claim
41 words
The process for producing flame retardant flexible polyurethane foams according to claim 1, in which the polyol is reacted with a sufficient amount of an isomeric mixture of toluene diisocyanate which contains more than about 76 percent by weight of 2,4-isomer.
Claim 5
Dependent Claim
31 words
The process for producing flame retardant flexible polyurethane foams according to claim 1, in which the dibromoneopentyl glycol/plasticizer mixture is incorporated in the reaction medium in the form of a solution.
Claim 6
Dependent Claim
27 words
The process for producing flame retardant flexible polyurethane foams according to claim 1, in which the dibromoneopentyl glycol/plasticizer mixture is incorporated in the form of a dispersion.
Claim 7
Dependent Claim
46 words
The process for producing flame retardant flexible polyurethane foams according to claim 1, in which from about 1 to about 5.5 percent by weight of water and from about 2 to about 15 percent by weight of dibromoneopentyl glycol/plasticizer mixture are used in the polymerization reaction.
Claim 8
Dependent Claim
30 words
The process for producing flame retardant flexible polyurethane foams according to claim 1, in which the weight ratio of plasticizer to dibromoneopentyl glycol is from about 50/50 to about 90/10.
Claim 9
Dependent Claim
26 words
The process for producing flame retardant flexible polyurethane foams according to claim 1, in which the weight ratio of plasticizer to dibromoneopentyl glycol is about 85/15.
Claim 10
Dependent Claim
22 words
The process for producing flame retardant flexible polyurethane foams according to claim 1, in which the plasticizer is a chlorinated phosphonate ester.
Claim 11
Dependent Claim
22 words
The process for producing flame retardant flexible polyurethane foams according to claim 1, in which the plasticizer is a chlorinated phosphate ester.
Claim 12
Dependent Claim
22 words
The process for producing flame retardant flexible polyurethane foams according to claim 1, in which the plasticizer is a brominated phosphate ester.
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) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |