| 摘要 |
The reaction between an organic compound containing at least one isocyanate group and an active hydrogen-containing compound is accelerated by conducting it in the presence of a bis-(b -dimethylaminoalkyl) ether, in which each alkyl is ethyl or propyl. Organic tin catalysts may also be present, and many are specified. Many mono- and polyfunctional isocyanates and active hydrogen compounds are specified, the latter including water, alcohols, amines, ureas, urethanes, phenols, thiols and carboxylic acids, including alkylene oxide adducts of these, and also including high-molecular compounds, e.g. hydroxyl-terminated polyesters and polyester ethers; alkylene oxide adducts of aromatic amine/phenol/aldehyde ternary condensation products; alkylene oxide adducts of polyphenols; polytetramethylene glycols; and hydroxyl-containing polymers such as polyvinyl alcohol, copolymers of vinyl alcohol with ethylenic monomers such as vinyl chloride, and dihydric phenol-epichlorhydrin reaction products. When reacting polyisocyanates with polyols, polyurethane foams may be prepared by carrying out the reaction in the presence of a blowing agent, such as water, hydrocarbons, halohydrocarbons and N,N1-dimethyl-dinitroso-terephthalamide emulsifying agents, such as a polysiloxane-polyoxyalkylene block copolymer, may be present.ALSO:The reaction between an organic compound containing at least one isocyanate group and an active hydrogen-containing compound is accelerated by conducting it in the presence of a bis-(b -dimethylaminoalkyl) ether, in which each alkyl is ethyl or propyl. Organic tin catalysts may also be present and many are specified. Many mono- and polyfunctional isocyanates and active hydrogen compounds are specified, the latter including water, alcohols, amines, ureas, urethanes, phenols, thiols and carboxylic acids, and including alkylene oxide adducts of these. Examples react phenyl iso cyanate with butanol and with water. Bis-(2-dimethylaminoethyl) ether is obtained from dimethylamine and bis-(2-chloroethyl) ether, and from 2-dimethylaminoethyl chloride and sodium 2-dimethylaminoethoxide; the last method is also used for bis-(2-dimethylamino-1-methylethyl) ether and 2-dimethylaminoethyl 2-dimethylamino-1-methylethyl ether. Tributyl tin phosphorus dibutoxide is prepared by reacting Bu3SnCl with Na to give Bu3SnNa, and reacting this with (BuO)2PCl to give Bu3SnP(OBu)2. |
