Polyisocyanate mixtures
AssigneeBayer Intellectual Property GmbH
InventorsDorota Greszta-Franz, Hans-Josef Laas, Reinhard Halpaap, Dieter Mager, Hans-Ulrich Meier-Westhues
Life of this patent
Estimating the term…
Abstract
The invention relates to novel solvent-free, monomer-depleted polyisocyanate mixtures, and to the use thereof for producing light-resistant and weather-resistant polyurethane bodies with high optical refraction and low optical dispersion.
Claims13
Solvent-free, low-monomer polyisocyanate mixtures A) having a content of isocyanate groups of from 11 to 23 wt. % and a mean isocyanate functionality of at least 2.3, which consist of from 5 to 95 wt. % of at least one polyisocyanate a-1) based on hexamethylene diisocyanate having an NCO content of from 16 to 24 wt. %, and from 5 to 95 wt. % of at least one polyisocyanate a-2) based on araliphatic diisocyanates having an NCO content of from 10 to 22 wt. %.
Dependencies are inferred from the claim text.