US 12,344,761 B2
Two-component solvent-based coating composition, method for coating a substrate, coated substrate, and use of such coating composition for improving erosion resistance
Andreas Meyerjürgens, Oldenburg (DE); Dirk Seeger, Oldenburg (DE); Igor Shishkov, Muenster (DE); and Miriam Wickbold, Wildeshausen (DE)
Assigned to Akzo Nobel Coatings International B.V., Amsterdam (NL)
Filed by Akzo Nobel Coatings International B.V., Amsterdam (NL)
Filed on Jan. 16, 2024, as Appl. No. 18/414,042.
Application 18/414,042 is a division of application No. 17/252,917, abandoned, previously published as PCT/EP2019/067114, filed on Jun. 27, 2019.
Claims priority of application No. 18181251 (EP), filed on Jul. 2, 2018.
Prior Publication US 2024/0228826 A1, Jul. 11, 2024
Int. Cl. C09D 175/06 (2006.01); C08G 18/42 (2006.01); C08G 18/62 (2006.01); C08G 18/78 (2006.01); C09D 7/20 (2018.01); C09D 7/62 (2018.01)
CPC C09D 175/06 (2013.01) [C08G 18/4238 (2013.01); C08G 18/6225 (2013.01); C08G 18/78 (2013.01); C08G 18/7893 (2013.01); C09D 7/20 (2018.01); C09D 7/62 (2018.01)] 12 Claims
 
1. A method for coating a substrate selected from rotor blades of wind turbines, rotor blades of helicopters, ship screws and aircraft, the method comprising:
applying a two-component solvent-based coating composition to the substrate; and
allowing the applied coating composition to cure,
wherein the two-component, solvent-based coating composition comprises
i) a base component comprising
(A) one or more polyester diols having a hydroxyl value in the range of from 150 to 500 mg KOH/g polyester diol;
(B) optionally one or more hydroxyl-functional acrylate resins having a hydroxyl value in the range of from 75 to 500 mg KOH/g resin; and
(C) one or more organosilane-modified inorganic fillers; and
ii) a curing component comprising
(D) one or more polyisocyanates,
in such amounts that the coating composition comprises:
5 to 50 wt % of the one or more polyester diols (A);
0 to 25 wt % of the one or more hydroxyl-functional acrylate resins (B);
10 to 70 wt % of the one or more organosilane-modified inorganic fillers (C);
5 to 40 wt % of the one or more polyisocyanates (D);
wherein the base component comprises no resins other than the one or more polyester diols (A) and any hydroxyl-functional acrylate resins (B);
the one or more polyisocyanates (D) are selected from trimers of di-isocyanates;
the coating composition comprises one or more organic solvents in an amount in the range of from 5 to 35 wt %; and
the coating composition has a viscosity in the range of from 50 to 2,000 mPa·s as measured by means of a rotary viscometer at a shear rate of 1000 s−1 and a temperature of 23° C., 30 seconds after combining and mixing the base component and the curing component.