US 12,234,373 B2
Two-component coating composition, method for coating a substrate, coated substrate, and use of such coating composition for improving erosion resistance
Dirk Seeger, Oldenburg (DE); Christoph Piecha, Stadland (DE); Dieter Hohnholz, Gross Ippener (DE); Oliver Bölke, Cloppenburg (DE); and Sandra Becker, Varel (DE)
Assigned to Akzo Nobel Coatings International B.V., Amsterdam (NL)
Appl. No. 17/277,526
Filed by Akzo Nobel Coatings International B.V., Arnhem (NL)
PCT Filed Sep. 18, 2019, PCT No. PCT/EP2019/074937
§ 371(c)(1), (2) Date Mar. 18, 2021,
PCT Pub. No. WO2020/058301, PCT Pub. Date Mar. 26, 2020.
Claims priority of application No. 18195806 (EP), filed on Sep. 20, 2018.
Prior Publication US 2021/0363382 A1, Nov. 25, 2021
Int. Cl. C09D 175/06 (2006.01); C08G 18/12 (2006.01); C08G 18/32 (2006.01); C08G 18/38 (2006.01); C08G 18/42 (2006.01); C08G 18/48 (2006.01); C08K 3/34 (2006.01); C08K 9/06 (2006.01); C09D 175/08 (2006.01)
CPC C09D 175/06 (2013.01) [C08G 18/12 (2013.01); C08G 18/3234 (2013.01); C08G 18/325 (2013.01); C08G 18/3838 (2013.01); C08G 18/4277 (2013.01); C08G 18/48 (2013.01); C08K 3/34 (2013.01); C08K 9/06 (2013.01); C09D 175/08 (2013.01)] 20 Claims
 
1. A substrate coated with an erosion resistant coating composition, the substrate being selected from wind turbine rotor blades and helicopter rotor, blades, and the erosion resistant coating composition being a two-component erosion resistant coating composition comprising:
i) a base component comprising:
(A) a di-amine resin with two secondary amine groups of general formula
(b2)-NH-(b1)-NH-(b2)
wherein
(b1) is a cycloaliphatic hydrocarbon group; and (b2) is, independently, selected from the group consisting of
—CnH2n—CN wherein n is an integer in the range of from 2 to 6, —CH2CH2—C(O)—O—CmH(2m+1) or —CH2CH(CH3)—C(O)—O—CmH(2m+1) wherein m is an integer in the range of from 1 to 6 alkyl radicals with 2 to 10 carbon atoms, and halogenated alkyl radicals with 2 to 10 carbon atoms; and
ii) a curing component comprising:
(B) a polyisocyanate prepolymer having two free isocyanate groups and an isocyanate content in the range of from 3 wt % to 9 wt %, based on solid weight of the polyisocyanate prepolymer; and
(C) optionally up to 3 wt % of a polyisocyanate with more than two free isocyanate groups, based on the total weight of polyisocyanates (B) and (C),
wherein the two-component erosion resistant coating composition comprises less than 5 wt % of polyol resin.