Patent GB-930635-A (GB)
Title: Preparation of polyurethanes
IPC: C08G77/00
Filed: 1959-10-23
Abstract: A process for the production of polyurethane plastics comprises reacting the condensation product of an alkylene oxide having a molecular weight of at least 500 and having reactive hydrogen atoms and an organic polyisocyanate in the presence of a catalyst comprising stannous chloride and/or a stannous salt of a carboxylic acid having from 1 to 18 carbon atoms.  In the preparation of cellular polyurethane foaming can be produced as a result of the presence of water in the reaction mixture or by the use of an inert gas blowing agent.  Preferably a siloxane oxyalkylene block copolymer is also present.  The stannous compounds are preferably used together with a tertiary amine catalyst such as triethylene diamine, N,N,N,N-tetramethyl butylene diamine or a 1-alkyl-4-(dialkylaminoalkylene) piperazine. Non-porous products can be prepared using a casting process or one in which a millable gum is formed.  Specified chain extenders for this type of process are glycol, water, diethylene glycol, trimethylol propane, diethanolamine, ethylene diamine and 1,3- and 1,4-butylene glycols. The condensation product of alkylene oxides include products based on glycols, triols, pentaerythritol, aromatic polycarboxylic acids or anhydrides and 2,21-bis-(4-hydroxy phenyl) propane.  In examples (1) foamed products are produced by reacting polypropylene ether glycol of M.W. 2,000, tolylene -2,4- and 2,6-diisocyanates, and an activator mixture containing stannous chloride, water and a siloxane oxyalkylene block copolymer.  In other examples the alkylene oxide condensates are triols and the catalysts are (2) stannous octoate and tetramethyl butylene diamine; (3) stannous oleate and N-ethylmorpholine; (4) stannous laurate; (5) stannous stearate and N-ethylmorpholine, methylene chloride being used as blowing agent.ALSO:A process for the production of polyurethane plastics comprises reacting the condensation product of an alkylene oxide having a molecular weight of at least 500 and having reactive hydrogen atoms and an organic polyisocyanate in the presence of a cataylst comprising stannous chloride and/or a stannous salt of a carboxylic acid having from 1 to 18 carbon atoms.  In the preparation of cellular polyurethanes foaming can be produced as a result of the presence of water in the reaction mixture or by the use of an inert gas blowing agent.  Preferably a siloxane oxyalkylene block copolymer is also present.  The stannous compounds are preferably used together with a tertiary amine catalyst such as triethylene diamine, N, N, N, N-tetramethyl butylene diamine or a 1 - alkyl - 4 (dialkylaminoalkylene) piperazine.  Non-porous products can be prepared using a casting process or one in which a millable gum is formed.  The condensation product of alkylene oxides include products based on glycols, triols, pentaerythritol, aromatic polycarboxylic acids or anhydrides and 2, 21-bis-(4-hydroxyphenyl) propane.  In Example (1) foamed products are produced by reacting polypropylene ether glycol of M.W. 2000, tolylene-2, 4- and 2, 6-diisocyanates, and an activator mixture containing stannous chloride, water and a siloxane oxyalkylene block copolymer.  In other examples the alkylene oxide condensates are triols and the catalysts are (2) stannous octoate and tetramethyl butylene diamine; (3) stannous oleate and N-ethyl-morpholine; (4) stannous laurate; (5) stannous stearate and N-ethylmorpholine, methylene chloride being used as blowing agent.