| 摘要 |
Polyurethanes are made by reacting the distillation residue from the production of aromatic diisocyanates by phosgenation of the corresponding diamines in an inert organic solvent which may act as a suspending agent for the diamines, with one or more compounds having at least two hydrogen atoms reactive with isocyanate groups by heating to a temperature sufficient to split off isocyanate groups from the distillation residue. Specified compounds having at least two hydrogen atoms reactive with isocyanate groups are alcohols, thioalcohols, polyesters, polyethers, primary and secondary di- and polyamides, polyesteramides and reactive products of any of the above described compounds containing OH, NH or NH2 groups with acid anhydrides, many being specified. Additives, e.g. sawdust, paper, cellulose, textile fabrics, crushed stone, asbestos, finely divided silica and tertiary amines may be present in the reaction mixture. The example describes the reaction of the distillation residue formed during the preparation of a tolylene diisocyanate mixture with a polyester derived from adipic acid, phthalic acid and hexanetriol.ALSO:Foamed polyurethanes are made by reacting the distillation residue from the production of aromatic diisocyanates by phosgenation of the corresponding diamines in an inert organic solvent which may act as a suspending agent for the diamines, with one or more compounds having at least two hydrogen atoms reactive with isocyanate groups and water by heating to a temperature sufficient to split off isocyanate groups from the distillation residue. Specified compounds having at least two hydrogen atoms reactive with isocyanate groups are alcohols, thioalcohols, polyesters, polyethers, primary and secondary di- and polyamines, polyesteramides and reactive products of any of the above described compounds containing OH, NH or NH2 groups, many being exemplified. Additives, e.g. sawdust, paper, cellulose, textile fabrics, crushed stone, asbestos, finely divided silica and tertiary amines may be present in the reaction mixture. |
