Patent GB-900392-A (GB)
Title: Improvements in or relating to the manufacture of polyurethanes
Inventor: COWDREY WILLIAM ARTHUR
IPC: C08G18/40
Filed: 1959-03-31
Abstract: An improved process for the manufacture of foamed polyurethanes by the interaction of an organic polyisocyanate, a predominantly secondary hydroxyl-ended polyether containing at least two hydroxyl groups and water, characterized in that interaction is carried out in the presence as catalyst of a basic compound comprising the hydroxide or weak acid salt, said acid having a pK value greater than 4 in water at 25 DEG C., of an alkali metal, alkaline earth metal or of a fully substituted quaternary ammonium, phosphonium or ternary sulphonium radical.  Many such catalysts are specified.  Specified polyisocyanates are hexamethylene diisocyanate, tolylene diisocyanates, diphenylmethane-4:41-diisocyanate, 3-methyldiphenylmethane-4:41-diisocyanate, m- and p-phenylene diisocyanates, chlorophenylene-2:41-diisocyanate, dicyclohexylmethane diisocyanate, 2:4:6-triisocyanatotoluene and 2:4:41-triisocyanatodiphenyl ether.  The process may be continuous or discontinuous and may be effected in the presence of t-amines, non-basic metal catalysts, non-ionic surface-active agents, silicone oils, foam stabilizing agents and fireproofing materials. Neutralizing agents which are neutral at ordinary temperatures but liberate a strong acid at reaction temperatures, e.g. benzene sulphonyl chloride and p-toluene sulphonyl chloride may also be present in the reaction mixture.  In the examples, polyurethane foams are made by reacting polypropylene glycol, water and mixtures of tolylene-2:4- and -2:6-diisocyanates in the presence of sodium hydroxide, sodium phenate, sodium methoxide, potassium hydroxide, sodium carbonate, calcium acetate, p-xylylene dipyridinium dichloride and benzyl trimethylammonium hydroxide, many other additives being specified.ALSO:An improved process for the manufacture of foamed polyurethanes by the interaction of an organic polyisocyanate, a predominantly secondary hydroxyl-ended polyether containing at least two hydroxyl groups and water characterized in that interaction is carried out in the presence as catalyst of a basic compound comprising the hydroxide or weak acid salt, said acid having a pK value greater than 4 in water at 25 DEG C. of an alkali metal, alkaline earth metal or of a fully substituted quarternary ammonium phosphonium or ternary sulphonium radical.  Many catalysts are specified.  Specified polyisocyanates are hexamethylene diisocyanate tolylene diisocyanates, diphenylmethane-4: 41-diisocyanate, 3-methyl-diphenyl methane-4: 41-diisocyanate, m-and p-phenylene diisocyanates, chlorophenylene-2:4-diisocyanate, dicyclohexylmethane diisocyanate, 2: 4: 6-triisocyanato toluene and 2:4: 41 triisocyanatodiphenyl ether.  The process may be continuous or discontinuous and may be effected in the presence of t-amines, non-basic metal catalysts, non-ionic surface active agents, silicone oils, foam stabilizing agents and fireproofing agents, silicone oils, foam stabilizing agents and fireproofing materials.  Neutralising agents which are neutral at ordinary temperatures but liberate a strong acid at reaction temperatures e.g. benzene sulphonyl-chloride and p-toluene sulphonyl chloride may also be present in the reaction mixture.  In examples, polyurethane foams are made by reacting polypropylene glycol, water and mixtures of tolylene-2:4-and-2:6-diisocyanates in the presence of sodium hydroxide, sodium phenate, sodium methoxide, potassium hydroxide, sodium carbonate, calcium acetate, p-xylylene dipyridinium dichloride and benzyl trimethylammonium hydroxide, many other activities being specified.