Polyisocyanate mixtures comprising cycloaliphatic structural elements
AssigneeBayer MaterialScience AG
InventorsHans-Josef Laas, Reinhard Halpaap, Dieter Mager, Markus Mechtel, Michael Ehlers, Reinhard Hertrampf
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Abstract
The present invention relates to innovative polyisocyanate mixtures comprising cycloaliphatic structural elements and containing exclusively linear-aliphatically attached free isocyanate groups, to a process for preparing them and to their use as a starting component in the production of polyurethane plastics, more particularly as a crosslinker component in polyurethane coating materials and coatings.
Claims14
Process for preparing polyisocyanate mixtures comprising cycloaliphatic structural elements and also linear-aliphatically attached free isocyanate groups, the process comprising reacting:
- A) a polyisocyanate component having an average functionality of 2.0 to 5.0 and a linear-aliphatically attached isocyanate group content (calculated at NCO;
- molecular weight=42) of 8.0% to 27.0% by weight
- with
- B) 2 to 80% by weight, based on the total amount of components A) and B), of at least one hydroxyurethane which is based on a cycloaliphatic di- and/or polyisocyanate, is free from isocyanate groups, optionally contains urea groups, has a number-average molecular weight of 260 to 8000 g/mol and has an average OH functionality of 1.0 to 6.0.
Dependencies are inferred from the claim text.