Patent GB-834328-A (GB)
Title: Process for the production of foam materials containing urethane groups
IPC: C08G18/18
Filed: 1957-07-19
Abstract: A process for the production of foam materials containing urethane groups comprises reacting an organic polyhydroxy compound with a polyisocyanate and water in the presence of an accelerator which is an organic tertiary amine of the general formula R-O-X-NR1R2 or R1R2N-X-O-R-O-X-NR1R2 or RO-X-O-X-NR1R2, in which formul  R represents an aliphatic, cycloaliphatic or aromatic radical, X an alkylene group with from 2 to 6 carbon atoms, and R1 and R2, which may be the same or different, alkyl or aralkyl radicals or R1 and R2 may, together with the nitrogen atom, form a ring which may contain hereto atoms in addition to the nitrogen atom.  The reactants can be mixed using the hand nozzle described in Specification 826,623.  In Example (1) a polyester from adipic acid, phthalic anhydride, trimethylol propane and triethanolamine is mixed with polyethylene oxide wax, siliceous chalk and silica aerogel, and a mixture of 2-diethylamino-ethyl phenyl ether and aqueous sulphonated castor oil, and is homogenized in the pre-mixing chamber of a mechanical mixer. Toluene diisocyanate is then added by injection mixing to produce the foam.  Other, generally similar, examples employ the bis-(N-diethylaminoethyl)-ether of resorcinol, dimethyl - (methoxy - ethoxy - propyl) - amine, dimethyl-(3-methoxypropyl)-amine and 1,3-dimethyl - 4,6 - bis - (21 - diethylamino - ethoxy -methyl)-benzene as catalysts.  As esters there are specified the reaction products of (2) adipic acid, phthalic anhydride, trimethylolpropane and oleic acid; (3) adipic acid, diethylene glycol and trimethylol propane; (6) adipic and phthalic acids and hexanetriol.ALSO:A process for the production of foam materials containing urethane groups comprises reacting an organic polyhydroxy compound with a polyisocyanate and water in the pressure of an accelerator which is an organic tertiary amine of the general formula R.O. X. NR1 R2 or R1R2 N-X-O-R-O-X-NR1R2 or RO-X-O-X-NR1 R2 in which formulae R represents an aliphatic, cycloaliphatic or aromatic radical, X an alkylene group with from 2 to 6 carbon atoms, and R1 and R2, which may be the same or different, alkyl or aryl radicals, or R1 and R2 may, together with the nitrogen atom, form a ring which may contain hetero atoms in addition to the nitrogen atom.  The reactants can be mixed using the hand nozzle described in Specification 826,623. In example (1) a polyester from adipic acid, phthalic anhydride, trimethylolpropane and triethanolamine is mixed with polyethylene oxide wax, siliceous chalk, and silica aerogel, and a mixture of 2-diethylaminoethyl phenyl ether and aqueous sulphonated castor oil, and is homogenised in the mixing chamber of a mechanical mixer.  Toluene diisocyanate is then added by injection mixing to produce the foam.  Other, generally similar examples employ the bis-(N-diethylaminoethyl) ether of resorcinal, dimethyl-(3-methoxypropyl) amine, dimethyl-(methoxy-ethoxypropyl) amine and 1, 3-dimethyl- 4, 6-bis (21-diethylamino-ethoxymethyl) benzene as catalysts.  As esters there are specified the reaction products of (2) adipic acid, phthalic anhydride, trimethylol-propane and oleic acid; (3) adipic acid, diethylene glycol and trimethylolpropane; (6) adipic and phthalic acids and hexanetriol.