Method for producing flame retardant flexible polyurethane foams

Details Method for producing flame retardant flexible polyurethane foams Method for producing flame retardant flexible polyurethane foams

1979-04-12

1981-06-23

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521108, 521171, C08G 1814

Patent

active

042751713

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.

REFERENCES:
patent: 3933693 (1976-01-01), Priest et al.
patent: 4052346 (1977-10-01), Rudner et al.
patent: 4194068 (1980-03-01), Miller et al.
Miller, "Neopentyl Bromide Based Flame Retardants for Urethane Foams," Presented at 24th Annual Technical Conf., SPI Urethane Division, Dow Chemical, USA, Oct. 26, 1978.

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