Polyurethane having high light refraction
AssigneeBayer Intellectual Property GmbH
InventorsHans-Josef Laas, Dorota Greszta-Franz, Reinhard Halpaap, Dieter Mager, Hans-Ulrich Meier-Westhues
Life of this patent
Estimating the term…
Abstract
The present invention relates to the use of solvent-free low-monomer polyisocyanates based on araliphatic diisocyanates for the production of light- and weather-resistant polyurethane bodies having a high light refraction and low dispersion.
Claims15
Method of producing light-fast compact or foamed polyurethane bodies using solvent-free polyisocyanate components A) which are built up from at least two araliphatic diisocyanates and have a content of isocyanate groups of from 10 to 22 wt. % and a content of monomeric diisocyanates of less than 1.0 wt. %.
Process for the production of light-fast polyurethane bodies comprising solvent-free reacting of:
- A) a polyisocyanate component which is built up from at least two araliphatic diisocyanates and has a content of isocyanate groups of from 10 to 22 wt. % and a content of monomeric diisocyanates of less than 1.0 wt. %, with
- B) reaction partners which are reactive towards isocyanate groups and have an average functionality of from 2.0 to 6.0, and optionally co-using
- C) further auxiliary substances and additives,
- maintaining an equivalent ratio of isocyanate groups to groups which are reactive towards isocyanates of from 0.5:1 to 2.0:1.
Dependencies are inferred from the claim text.