Method for producing polyisocyanates of (cyclo)aliphatic diisocyanates which are flocculation-stable in solvents
AssigneeBASF SE
InventorsHarald Schaefer, Thomas Genger, Sebastian Emmerling
Life of this patent
Estimating the term…
Abstract
The present invention relates to a new process for preparing polyisocyanates containing isocyanurate groups and being flocculation-stable in solvents from (cyclo)aliphatic diisocyanates.
Claims10
A method for reducing flocculation and/or precipitation in a polyisocyanate mixture which comprises at least one solvent (C) and at least one polyisocyanate (A) comprising a polyisocyanurate based on hexamethylene diisocyanate, the method comprising adding, to the polyisocyanate mixture, tristrimethylsilyl phosphate, in an amount of 10 to 100 ppm by weight based on the at least one polyisocyanate (A), to obtain a polyisocyanate mixture comprising the tristrimethylsilyl phosphate.
A method for stabilizing a polyisocyanate mixture which comprises at least one solvent (C) and at least one polyisocyanate (A) comprising a polyisocyanurate based on hexamethylene diisocyanate against flocculation during storage, the method comprising admixing the polyisocyanate mixture with tristrimethylsilyl phosphate, in an amount of 10 to 100 ppm by weight based on the at least one polyisocyanate (A).
A method for coating a substrate with a polyisocyanate mixture which comprises at least one polyisocyanate (A) comprising a polyisocyanurate based on hexamethylene diisocyanate and is stabilized against flocculation during storage in a solvent, the method comprising:
- admixing the polyisocyanate mixture with tristrimethylsilyl phosphate, in an amount of 10 to 100 ppm by weight based on the at least one polyisocyanate (A), to obtain a mixture;
- admixing the mixture with at least one solvent (C) and optionally other additives, to obtain a composition;
- storing the composition, to obtain a stored composition;
- subsequently admixing the stored composition with at least one binder-comprising component, to obtain an admixed composition;
- and
- subsequently applying the admixed composition to a substrate.
Dependencies are inferred from the claim text.