Article coated with intumescent undercoat of a synthetic resin, inorganic foam forming agent and carbon forming agent and water-insoluble organic solvent based resin overcoat

Claim 2

The method of claim 1 wherein a pigment is present in said overcoating material in amounts of about 35 to 65 weight percent of said overcoating material.

Claim 3

An article having thereon a fire resistant intumescent undercoat formed from an undercoating material comprising an aqueous mixture of a synthetic resin consisting essentially of a member selected from the group consisting of urea formaldehyde, polyvinyl chloride, neoprene, polyvinyl acetate, polyacrylate, polystyrene, copolymer of styrene and butadiene, copolymer of vinylidene chloride and acrylonitrile, copolymer of butadiene and acrylonitrile, copolymer of styrene and acrylonitrile and theIr mixtures, said synthetic resin being present in amounts of 5 - 20 weight percent of said mixture, an inorganic foam forming agent consisting essentially of a member selected from the group consisting of mono-ammonium phosphate, di-ammonium phosphate, phosphoric acid, ammonium sulfate, sulfamic acid, sodium borate, boric acid, carbamic phosphoric acid, vermiculite and their mixtures, said foam forming agent being present in amounts of 25 to 40 weight percent of said mixture and a carbon forming agent consisting essentially of a member selected from the group consisting of casein, starch, isano oil, gum tragacanth, gum arabic, Irish moss and their mixtures, said carbon forming agent being present in amounts of 5 - 20 weight percent of said mixture, and a non-flammable, water-insoluble overcoat applied over said undercoat said water-insoluble overcoat formed from an undercoating material consisting essentially of an organic solvent based resin which is essentially incompatible with said undercoat, said organic solvent based resin consisting essentially of a member selected from the group consisting of chlorinated rubber and alkyd resin selected from the group consisting of medium-oil alkyd resin, long-oil alkyd resin, very long oil alkyd resin and chlorinated alkyd resin containing 60 percent chlorine, said organic solvent based resin being present in amounts of 15 - 35 weight percent of said overcoating material.

Claim 4

The article in claim 4 wherein the resin in the overcoat is an alkyd resin or chlorinated rubber.

Claim 5

The article in claim 5 wherein the alkyd resin is a halogenated alkyd resin.