	US 11,807,709 B2
	Method for producing polyisocyanates of (cyclo)aliphatic diisocyanates which are flocculation-stable in solvents
Harald Schaefer, Ludwigshafen (DE); Daniel Flojhar, Ludwigshafen (DE); Jens Scheidel, Ludwigshafen (DE); Thomas Genger, Ludwigshafen (DE); Sebastian Emmerling, Ludwigshafen (DE); Matthias Kroner, Ludwigshafen (DE); and Guillermo Arens, Ludwigshafen (DE)
Assigned to BASF SE
Appl. No. 16/339,124
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Oct. 2, 2017, PCT No. PCT/EP2017/074933 § 371(c)(1), (2) Date Nov. 14, 2019, PCT Pub. No. WO2018/065343, PCT Pub. Date Apr. 12, 2018.
Claims priority of application No. 16192852 (EP), filed on Oct. 7, 2016.
Prior Publication US 2020/0262968 A1, Aug. 20, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. C08G 18/79 (2006.01); C08G 18/73 (2006.01); C08K 5/17 (2006.01); C08K 5/521 (2006.01); C08K 5/5313 (2006.01); C08K 5/5333 (2006.01); C09D 175/04 (2006.01); C08K 5/5317 (2006.01)

CPC C08G 18/792 (2013.01) [C08G 18/73 (2013.01); C08K 5/17 (2013.01); C08K 5/521 (2013.01); C08K 5/5313 (2013.01); C08K 5/5333 (2013.01); C09D 175/04 (2013.01)]

16 Claims

1. A method comprising:

adding at least one additive into a polyisocyanate mixture comprising at least one solvent, and reducing flocculation and/or precipitation in the polyisocyanate mixture,

wherein the additive comprises a salt of:

(A1) at least one phosphorus-containing acidic compound selected from the group consisting of

(A1a) a mono- and/or di-C₁to C₁₈alkyl phosphate,

(A1b) a mono- and/or di-C₁to C₁₈alkyl phosphonate,

(A1c) a mono-C₁to C₁₂alkyl phosphinate, and

(A1d) an alkyl derivative of a phosphorus-containing diacid, and

(A2) at least one open-chain trisubstituted amine;

wherein the at least one additive is used in a concentration of 200 to 300 ppm by weight based on the polyisocyanate.