Abstract: Non-burning, non-dripping instant set microcellular polyurethanes involving an isocyanate-terminated reaction product of polyisocyanate with low molecular weight polyether polyol or polyol blends in the presence of other ingredients such as inert liquids with boiling points above about 150.degree. Celsius and accelerating agents for urethane formation. Specifically, this invention provides an improved mode for flame retarding polyurethane compositions by incorporating a mixture of dibromoneopentyl glycol (DBNG) or its esters and a non-reactive flame retardant plasticizer when dissolved or dispersed into the urethane polymer. Molecular sieves are included, which enhance char formation. The compositions have applications with stringent fire retardancy standards, such as electrical insulators, industrial housings, annular spacers, decorative objects, furniture or furniture components, gear and machine components, agricultural components and other related areas.

Abstract: This invention is directed to a process for producing flame retardant flexible polyurethane foams having a porosity generally 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, preferably about 3,500 to 6,500, is reacted with a polyisocyanate, such as toluene diisocyanate, which comprises a mixture of 2,4- and 2,6-toluene diisocyanate isomers. The formulation of the present invention includes a flame retardant mixture of a plasticizer and dibromoneopentyl glycol. The plasticizer is either a halogented phosphonate or halogenated phosphate ester. Chlorine is the preferred halogen atom. The weight ratio of those ingredients is between about 20/80 and about 90/10. The concentration of that mixture is in excess of about 20 to about 60 percent by weight of the polyol.

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.