Polyurethanes made with copper catalysts

摘要

Polyisocyanate-based polymers are formed by curing a reaction mixture containing at least one polyisocyanate and at least one isocyanate-reactive compound having at least two isocyanate-reactive groups in the presence of a copper catalyst that contains at least one copper atom associated with a polydentate ligand that contains at least one nitrogen-containing complexing site.

主权项

1. A process for preparing a polyisocyanate-based polymer, comprising forming a reaction mixture containing at least one polyisocyanate, at least one isocyanate-reactive compound having at least two isocyanate-reactive groups and at least one copper catalyst, and then curing the reaction mixture to form a polymer, wherein the copper catalyst contains at least one copper atom associated with a polydentate organic ligand that contains at least two complexing sites, of which at least one is nitrogen-containing, wherein the ligand is
an α-amino hydroxyl compound or α-imino hydroxyl compound having either of the structures I and IA wherein R5 is a group that is bonded to the indicated nitrogen atom through a carbon, oxygen, nitrogen or silicon atom, each R1 is a linear or branched alkyl group that has up to thirty carbon atoms which may be substituted with an inert substituent, or an aromatic group which may be substituted with alkyl, hydrocarbyl, one or more complexing sites and/or one or more inert substituents, each R3 is selected from hydrogen; a linear or branched alkyl group that has up to thirty carbon atoms which may be substituted with one or more complexing sites or one or more inert substituents; a cycloalkyl group which may be substituted with one or more hydrocarbyl substituents, inert substituents and/or complexing sites; and an aromatic group which may be substituted with alkyl or other hydrocarbyl substituents, one or more inert substituents and/or one or more complexing sites, and each R4 is independently hydrogen or a group that is bonded to the indicated nitrogen atom through a carbon, oxygen, nitrogen or silicon atom, further provided that in structure I an R4 group and an R5 group may together form a divalent group that is bonded to the indicated nitrogen atom through carbon, oxygen, nitrogen and/or silicon atoms, and further provided that an R3 and an R5 group may together form a divalent group that is bonded to the indicated carbon atom and the indicated nitrogen atom though carbon, oxygen, nitrogen and/or silicon atoms.