Patent GB-938398-A (GB)
Title: Improvements in and relating to the production of polyurethane foam material
IPC: C08G18/48
Filed: 1960-01-25
Abstract: A method of preparing a polyurethane foamed material comprises simultaneously reacting together a polyether or polythioether polyol, an organic compound having at least two NCX groups in the molecule, where X represents in the case of each radical an oxygen or sulphur atom, and water at a pH value of at least 7,5 in the presence of a surface-active agent, foaming the reaction mixture and curing the foamed product.  Suitable surface-active agents are soaps, that is alkali metal salts of fatty acids obtained from animal and vegetable fats and oils, non-ionic surfactants, such as polyalkylene glycol esters of saturated or unsaturated fatty acids containing at least 10 carbon atoms in the molecule, or condensation products of alkylene oxides with saturated or unsaturated aliphatic alcohols containing at least 10 carbon atoms or with alkyl-substituted aromatic hydroxy compounds.  The reaction mixture may be rendered alkaline by the addition of hydroxides of ammonium or alkali or alkaline earth metals, and salts of weak acids such as ammonium, sodium or potassium carbonate, or potassium ricinoleate, the latter serving also as surface-active agent.  Polyether diols and triols, polydiglycol formals, polyether diamines, polythioethers and hydrids between a polythioglycol and an ordinary polyglycol are referred to as starting materials.  Catalysts specified are tertiary amines, dialkyltin diesters or an addition product of hydrogen chloride and N-methylmorpholine.  The products may have closed or open cells depending on reaction conditions, proportions, and whether or not an insulated mould is used in the foaming stage.  In Examples (IV) a stirred mixture of polypropylene glycol, a triol with two polypropylene glycol chains on a hexanetriol nucleus, castor oil soap (in aqueous sodium carbonate solution), polydimethylsiloxane and tolylene diisocyanates is poured into a mould.  The foamed product is heated at 70 DEG C. and then mangled through successively closer set rollers; (VI) polypropylene glycol is mixed with polydimethylsiloxane oil and then with a solution of sodium ricinoleate in aqueous sodium carbonate.  Toluene diisocyanate is stirred in and when foaming begins the mixture is poured into an insulated mould, which is put under an infra-red lamp, to keep the walls and upper surface at a temperature above 100 DEG C.ALSO:A method of preparing a polyurethane foamed material comprises simultaneously reacting together a polyether or polythioether polyol, an organic compound having at least two NCX groups in the molecule, where X represents in the case of each radical an oxygen or sulphur atom, and water at a pH value of at least 7,5 in the presence of a surface-active agent, foaming the reaction mixture and curing the foamed product.  Suitable surface-active agents are soaps, that is alkali metal salts of fatty acids obtained from animal and vegetable fats and oils, non-ionic surfactants, such as polyalkylene glycol esters of saturated or unsaturated fatty acids containing at least 10 carbon atoms in the molecule or condensation products of alkylene oxides with saturated or unsaturated aliphatic alcohols containing at least 10 carbon atoms or with alkyl-substituted aromatic hydroxy compounds.  The reaction-mixture may be rendered alkaline by the addition of hydroxides of ammonium or alkali or alkaline earth metals, and salts of weak acids such as ammonium, sodium or potassium carbonate, or potassium ricinoleate, the latter serving also as surface-active agent.  Polyether diols and triols, polydiglycol formals, polyether diamines, polythioethers and hydrids between a polythio-glycol and an ordinary polyglycol are referred to as starting materials.  Catalysts specified are tertiary amines, dialkyltin diesters or an addition product of hydrogen chloride and N-methylmorpholine.  The products may have closed or open cells depending on reaction conditions, proportions, and whether or not an insulated mould is used in the foaming stage.  In Examples (IV) a stirred mixture of polypropylene glycol, a triol with two polypropylene glycol chains on a hexanetriol nucleus, castor oil soup (in aqueous sodium carbonate solution) polydimethylsiloxane and tolylene diisocyanates is poured into a mould.  The foamed product is heated at 70 DEG C. and then mangled through successively closer set rollers; (VI) polypropylene glycol is mixed with polydimethylsiloxane oil and then with a solution of sodium ricinoleate in aqueous sodium carbonate.  Toluene diisocyanate is stirred in and when foaming begins the mixture is poured into an insulated mould, which is put under an infra-red lamp to keep the walls and upper surface at a temperature above 100 DEG C.