Process for the production of light-stable polyisocyanates containing allophanate groups
AssigneeBayer Aktiengesellschaft
InventorsHarald Mertes, Josef Pedain, Reinhard Halpaap
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Abstract
The present invention relates to a process for the production of polyisocyanates containing allophanate groups and having aliphatically and/or cycloaliphatically bound isocyanate groups by reacting organic compounds containing urethane groups with organic polyisocyanates containing aliphatically and/or cycloaliphatically bound isocyanate groups in the presence of tin compounds and to the use of these polyisocyanates, optionally blocked with blocking agents for isocyanate groups, as an isocyanate component in the production of polyurethanes, in particular polyurethane coatings.
Claims8
A process for the production of a polyisocyanate containing allophanate groups and in which the isocyanate groups consist essentially of aliphatically and/or cycloaliphatically bound isocyanate groups which comprises reacting an organic compound containing urethane groups with an organic polyisocyanate containing aliphatically and/or cycloaliphatically bound isocyanate groups in the presence of a tin compound.
Dependencies are inferred from the claim text.