Patent GB-1055555-A (GB)
Title: Improvements in or relating to fire retardants
Inventor: STUMPP CARL
IPC: C08K3/32
Filed: 1964-08-04
Abstract: A fire-retardant composition comprises a non-oxidizing mineral acid salt of a condensation product of an aldehyde with an amino-1,3,5-triazine, the alkylol groups of which have been at least 50%, preferably 60-80%, at most 90%, etherified with at least one monohydric alcohol of up to 4 carbon atoms.  Suitable amino-triazines are melamine, ammeline and guanamines, aldehydes are formaldehyde, acetaldehyde or hydroxyaldehydes, alcohols are methanol, ethanol, the propanols and the butanols, acids are hydrochloric, sulphuric, boric and phosphoric acids, and e.g. monoammonium orthophosphate.  The aminotriazine may be mixed with urea, thiourea, dicyandiamide and guanidine.  Other fire-retardant materials may be added up to 25 weight per cent of the resin and may be inorganic salts, e.g. ammonium sulphate, chloride, orthophosphate, pyrophosphate or polyphosphate, or an alkali metal borate or polyborate, or chlorine- or bromine-containing organic compounds, e.g. hexachloroethane or tris-(dibromopropyl) phosphate.  Skeleton-forming substances may also be added up to 20 weight per cent of the total composition, e.g. dextrin, starch, sugar or proteins, and up to 10 weight per cent of the final composition each may be added of softeners, e.g. tricresyl phosphate, trichloroethyl phosphate and dibutyl or dioctyl phthalates, diluents or solubilizing promoters, e.g. ethylene glycol, butanediol-1,4, diethylene glycol monoethyl ether or diethylene glycol monopropyl ether, and water binders, e.g. lactic acid or calcium lactate or ethyl or butyl lactate, sorbitol, mannitol, pentaerythritol, dipentaerythritol, glycerol, trimethylol-ethane or -propane, or 2,2-dimethylol-1,5-dihydroxy-pentane, and 0.5-2 weight per cent of a pH adjuster, e.g. maleic anhydride.  When these compositions are used as solutions or dispersions antifoam agents may be added, as may be film-forming agents, e.g. alkyd resins, cellulose ethers or cellulose esters.  Inorganic and organic pigments, soluble dyestuffs, and fungicides may also be added.  In examples, compositions are prepared by mixing a methylated tetramethylomelamine containing ethylene glycol or butylene glycol and, in two cases, maleic anhydride with an aqueous solution of a dicyandiamide-formaldehyd condensate containing also dextrin, phosphoric acid, ethylene glycol or diethylene glycol mono-propyl ether and tricresyl phosphate or hydrochloric acid, and, in Example 1, lactic acid and a wetting agent.ALSO:Wood-chip and wood-fibre boards, plywood, veneer boards, sawn timber, cardboard, paper fabrics and plastics may be coated with a fire-retardant composition comprising a non-oxidising mineral acid salt of an amino -1:3:5-triazine/aldehyde condensate whereof at least 50% of the alkylol groups have been etherified with a C 1-4 alcohol.  The composition may also comprise fire-retardant inorganic salts or chloro-or bromo-organic compounds, and skeleton-forming substances, e.g. dextrin, sugar, starch or proteins, and other conventional additives, and may be mixed with other film-forming agents e.g. alkyd resins and cellulose ethers or esters.  In Examples cardboard, spruce boards, macore plywood and sawn pine are coated with a mixture of a partially methylated tetramethylolmelamine and a dicyandiamide/formaldehyde condensate, phosphoric acid, a glycol, tricresyl phosphate or HCl, and dextrin.  Coating may be by e.g. dipping, spraying or painting.