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AssigneeBASF SE
InventorsManfred Genz, Walter Haselhorst, Torsten Jeschke, Ute Nichau, Heinz Bollmann, Michael Strauss, Wolfgang Scholz, Rüdiger Voelkel, Hartmut Peuker, Gerhard Hellmann
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Compact and preferably cellular polyurethane elastomers are produced by reacting a) polyhydroxyl compounds having molecular weights of from 800 to 6000 and, if desired, b) chain extenders and/or crosslinkers having molecular weights of up to 800 [lacuna] c) naphthylene 1,5-diisocyanate and at least one additional aromatic diisocyanate selected from the group consisting of tolylene diisocyanate, diphenylmethane diisocyanate, 3,3′-dimethylbiphenyl diisocyanate, 1,2-diphenylethane diisocyanate and phenylene diisocyanate, and/or aliphatic diisocyanate having from 4 to 12 carbon atoms and/or cycloaliphatic diisocyanate having from 6 to 18 carbon atoms, where the formative components (a), (c) and, if used, (b) are preferably reacted by the prepolymer method, in the presence or absence of d) catalysts, e) blowing agents and f) additives. Isocyanate prepolymers suitable for this purpose are also described.
A process for the formation of non-thermoplastic polyurethane elastomers comprising the steps of:
A process for forming an isocyanate-terminated prepolymer containing isocyanate groups, having an NCO content of from 3.3 to 10% by weight comprising first reacting at least one polyhydroxyl compound a) or a mixture of a) and a chain extender and/or crosslinker b) with at least one aromatic diisocyanate selected from the group consisting of tolylene diisocyanate, diphenylmethane diisocyanate, 3,3′-dimethylbiphenyl diisocyanate, 1,2-diphenylethane diisocyanate, phenylene diisocyanate, hexamethylene 1,6-diisocyanate, and 1-isocyanto-3,3,5-trimethyl-5-isocyanatomethylcyclohexane to give a polyaddition product containing urethane and isocyanate groups and having an NCO content of from 0.05 to 8% by weight, and subsequently reacting the reaction product with naphthylene 1,5-diisocyanate to give the prepolymer.
A process for forming an isocyanate-terminated prepolymer containing isocyanate groups, having an NCO content of from 3.3 to 10% by weight comprising first reacting a difunctional polyhydroxyl compound having a molecular weight of greater than 800 to 3500 and selected from the group consisting of polyester polyols, hydroxyl-containing polycarbonates and polyoxytetramethylene glycols with diphenylmethane 4,4′-diisocyanate to give a polyaddition product containing urethane and isocyanate groups, then subsequently reacting the product with naphthylene 1,5-diisocyanate to give the prepolymer containing isocyanate groups.
Dependencies are inferred from the claim text.