Patent GB-683560-A (GB)
Title: Improvements in synthetic resin fire-retardant compositions
IPC: D06M15/667
Filed: 1950-06-19
Abstract: A fire retardant composition comprises (1) a condensation product of 4,41-dihydroxy diphenyl dimethyl methane with epichlorhydrin and (2) a reaction product of phosphoryl chloride with ammonia.  Specified examples of (2) are diamido diphosphoric acid and a substance termed "polyphosphorylamide," described and claimed in Specification 683,572.  The composition may also include a thermosetting resin, e.g. a phenol-formaldehyde resin, but preferably aminoplast, e.g. a condensation product of formaldehyde and its polymers; acetaldehyde; propionaldehyde; furfural or glyoxal with urea; thiourea; guanidine; cyanamide; dicyandiamide; 2-chloro-4-,6-diamino-1,3,5 triazine; 2-hydroxyl-4,6-diamino-1,3,5 triazine; alkyl guanamines; aryl guanamines or other compounds containing 1 to 9 carbon atoms and the grouping <FORM:0683560/IV (a)/1> where Z is O, S or N-.  Alkylated derivatives of the above made by reacting them with methanol, ethanol, propanol or butanol may also be used.  The composition may be cured by baking at 225-450 DEG  F. or adding an alkaline catalyst, e.g. phenyl trimethyl ammonium hydroxide, tetraethyl ammonium hydroxide, diethylene triamine, triethylene tetramine, tetraethylene pentamine, ethylene diamine or propylene diamine and, if desired, heating to 125-450 DEG  F. Exemplified coating compositions are of "polyphosphorylamide" and the condensation product of 4,41-dihydroxy diphenyl dimethyl methane with epichlorhydrin and (1) butyl ether of a mixture of methylol melamines and methylol phenyl guanamines, n-butanol, toluol, xylol and diethylene triamine; (2) butyl ethers of methylol ureas, titanium dioxide pigment, 2-ethoxy ethyl acetate and xylol; (3) butylated melamine-formaldehyde resin, condensate of toluene sulphonamide with formaldehyde (plasticizer), toluidene red pigment, sec.-butyl alcohol, toluol, n-butyl acetate and xylol; (4) methyl ethyl ketone, toluol and diethylene triamine.  Instead of the exemplified solvents there may be used, e.g. acetone, methyl isobutyl ketone, cyclohexanone, diacetone alcohol, methyl acetate, ethyl formate, methyl acrylate, ethyl acetate, methyl methacrylate, ethyl lactate, diethyl carbonate, propylene oxides, dihydropyran, dioxane, tetrahydropyran, tetrahydrofuran, chloroform, ethylene dichloride, dichloroethyl ether, 2-ethoxy-ethanol 2-butoxyethanol or mixtures. Hydrocarbons mixed with alcohols may also be used, e.g. toluene or xylene with methyl isobutyl carbinol, n-butyl alcohol, ethyl alcohol or isopropyl alcohol.  There may be used other pigments, e.g. cellulose or finely-divided insoluble resins and other plasticizers e.g. triphenyl phosphate, tricresyl phosphate, cresyl diphenyl phosphate, octyl diphenyl phosphate, polyester resins, e.g. the reaction products of sebacic acid with glycerol and ethylene glycol, and condensation products of other aromatic sulphonamides with formaldehyde.  Polyhydric alcohols and amino acids which improve the intumescing properties of the composition and may serve as plasticizers, e.g. pentaerythritol, di- and tri-pentaerythritol, sorbitol and glutamic acid may also be added.  Alcohol acids, e.g. mucic acid, may also be added.  The compositions are suitable for applying to paper, wood, plastic or metal surfaces.