Fire suppressant composition and use thereof

Claim 1

A polyurethane composition for providing a unitary backing for tufted or woven carpets which comprises the catalyzed reaction product of a polyurethane forming mixture comprising (A) a relatively high molecular weight polyether polyol having an average of from 2 to about 8 hydroxyl groups per molecule and an average hydroxyl equivalent weight of from about 500 to about 2200 or a mixture of such polyols; (B) a relatively low molecular weight polyol having an average of from about 2 to about 8 hydroxyl groups per molecule and an average equivalent weight of from about 31 to about 230 or a mixture of such polyols; (C) an organic polyisocyanate or polyisothiocyanate having an average of from about 2 to about 4NCX (each X being independently O or S) groups per molecule or a mixture of such isocyanates or isothiocyanates; and (D) a filler component comprising (1) an inorganic filler component comprising (a) hydrated alumina, (b) lead-containing compound, (c) antimony compound, and wherein component (a) is present in quantities of from about 10 to about 55 percent by weight of the combined weight of the components of (D-1); component (b) is present in quantities of from about 0.01 to about 2 percent by weight of the combined weight of the components of (D-1); component (c) is present in quantities of from about 46 to about 90 percent by weight of the combined weight of the components of (D-1) and such compounds have an average particle size of from about 0.02 to about 18 microns, and an average surface area of from about 0.7 to about 75 m 2 /gram; (2) a halogen-containing resin containing at least about 85% halogen by weight and an average particle size of from about 9 to about 60 microns; with the proviso that (a) if it is desired that the urethane backed carpet pass the Vertical Flammability Test employing a flame temperature of greater than about 1550° F. (843° C.), then component (D-1) also contains a hydrated zinc compound in an amount of from about 12 to about 40 percent by weight of the combined weight of the components of (D-1), and (b) if the carpet substrate is woven and has a stitch rate of at least 50 tufts per square inch (7.55 tufts per square centimeter) then a sufficient quantity of (E) an organometallic viscosity reducing agent is employed to provide a mixture of components (A), (B), (D) and (E) with a viscosity of less than about 14,000 (14 Pa.s) centipoise at 33° C.; and wherein (1) components (A) and (B) are present in quantities such that the ratio of the number of hydroxyl equivalents contributed by component (B) to the number of hydroxyl equivalents contributed by component (A) is from about 0.8:1 to about 5.5:1, (2) components (A), (B) and (C) are present in quantities so as to provide an NCX to OH ratio of from about 0.95:1 to about 1.5:1; (3) component (D-1) is present in quantities of from about 20 to about 60 percent by weight based upon the combined weight of components A, B and D; and (4) component (D-2) is present in quantities of from about 10 to about 35 percent by weight based on the combined weight of components A, B and D.