Patent GB-1007785-A (GB)
Title: Improvements relating to polyurethane cellular material
IPC: C08G18/72
Filed: 1963-09-09
Abstract: The invention comprises a tolylene diamine phosgenation product which is a tolylene diisocyanate solution of polyisocyanate solutes, the solution having (1) a weight concentration of hexane-insoluble solute between 20 and 55%, (2) an infra-red absorption spectrum including an absorbance maximum in each of the regions 4.3 to 4.5 microns, 5.8 to 5.9 microns, and 5.95 to 6.05 microns, (3) a molar concentration of solute such as to import to the spectrum, at the absorbance maximum between 5.8 and 5.9 microns, an absorbance between 0.2 and 0.5, (4) an amine equivalent between 98 and 120, (5) a recoverable tolylene diisocyanate content, as measured in a gas chromatograph, between 55% and 85% by weight, (6) a viscosity between 20 and 10.000 c.f.s. at 25 DEG  C., and (7) a density between 1.23 and 1.29 at 25 DEG  C.  The product is obtained by (1) mixing tolylene diamine, phosgene and a solvent at -20 DEG  C. to 100 DEG  C. in such proportions that the molar ratio of phosgene to tolylene diamine is at least 2.2 and the weight ratio of tolylene diamine to solvent is between 0.05 and 0.5, said solvent having a relative volatility at 140 DEG  C. compared with tolylene diisocyanate of between 4 and 100, (2) heating the mixture at 100 DEG  to 200 DEG  C. and at a superatmospheric pressure sufficient to maintain a stoichiometric excess of phosgene in the reaction medium, until the reaction is complete, (3) separating phosgene and hydrogen chloride from the resulting solution, and (4) distilling solvent and some tolylene diisocyanate from the solution until the product has the characteristics described above.  Examples are given.  Polyurethane foams are obtained by reacting a product as described above with a polyether containing at least two hydroxyl groups, in the presence of a blowing agent.  In examples foams are obtained from tolylene diamine phosgenation products and a polyoxypropylene polyol, a mixture of polyether triols, a polyether obtained by condensing propylene oxide with sucrose, a polyether obtained by condensing propylene oxide with di-(ethylenediamine), and a condensation product of propylene oxide with sorbitol, together with trichloromonofluoromethane as blowing agent and dibutyltin dilaurate, dimethylethanol amine, tetra (hydroxypropyl) ethylenediamine, and silicones. Other starting materials are mentioned.ALSO:The invention comprises a tolylene diamine phosgenation products which is a tolylene diisocyanate solution of polyisocyanate solutes, the solution having (1) a weight concentration of hexane-insoluble solute between 20% and 55%, (2) an infra-red absorption spectrum including an absorbance maximum in each of the regions 4.3 to 4.5 microns, 5.8 to 5.9 microns, and 5.95 to 6.05 microns, (3) a molar concentration of solute such as to impart to the spectrum, at the absorbance maximum between 5.8 and 5.9 microns, an absorbance between 0.2 and 0.5, (4) an amine equivalent between 98 and 120, (5) a recoverable tolylene diisocyanate content, as measured in a gas chromatograph, between 55% and 85% by weight, (6) a viscosity between 20 and 10,000 c.f.s. at 25 DEG  C., and (7) a density between 1.23 and 1.29 at 25 DEG  C.  The product is obtained by (1) mixing tolylene diamine, phosgene and a solvent at -20 DEG  to 100 DEG  C. in such proportions that the molar ratio of phosgene to tolylene diamine is at least 2.2 and the weight ratio of tolylene diamine to solvent is between 0.05 and 0.5, said solvent having a relative volatility at 140 DEG  C. compared with tolylene diisocyanate of between 4 and 100, (2) heating the mixture at 100 DEG to 200 DEG  C. and at a superatmospheric pressure sufficient to maintain a stoichiometric excess of phosgene in the reaction medium, until the reaction is complete, (3) separating phosgene and hydrogen chloride from the resulting solution, and (4) distilling solvent and some tolylene diisocyanate from the solution until the product has the characteristics described above.  Examples are given.