Non-ionic hydrophilized polyisocyanates having a very low monomer content
AssigneeCovestro Deutschland AG
InventorsHans-Josef Laas, Claudine Stoye, Patrick Franke
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Abstract
The invention relates to a process for producing hydrophilically modified polyisocyanates having a very low content of monomeric diisocyanates, to the polyisocyanates obtainable or obtained by said process and to the use thereof for producing polyurethane plastics. The invention further relates to coating compositions containing the nonionically hydrophilized polyisocyanates and to the substrates coated with these coating compositions.
Claims15
A process for producing hydrophilically modified polyisocyanates having a content of monomeric diisocyanates of less than 0.10% by weight based on the solids content of the hydrophilically modified polyisocyanates comprising reaction of
- A) at least one polyisocyanate component having aliphatically, cycloaliphatically, araliphatically and/or aromatically bonded isocyanate groups which comprises at least uretdione structures and uretonimine structures at most in amounts which are below a detection limit by means of 400 MHz proton-decoupled 13C NMR with
- B) at least one nonionically hydrophilic organic compound comprising at least one isocyanate-reactive group,
- wherein the nonionically hydrophilic organic compound B) has a content of phosphorus of not more than 50 ppm and a total content of phosphorus based on components A) and B) of the hydrophilically modified polyisocyanate is not more than 20 ppm.
A nonionically hydrophilized polyisocyanate comprising uretdione structures and uretonimine structures at most in amounts which are below a detection limit by means of 400 MHz proton-decoupled 13C NMR and less than 0.10% by weight of monomeric diisocyanates based on the solids content of the hydrophilically modified polyisocyanates and not more than 20 ppm of phosphorus.
Dependencies are inferred from the claim text.