| 代理机构 |
Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. |
代理人 |
Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. |
| 主权项 |
1. A two-component polyurethane coating composition, comprising as synthesis components:
(A) at least one polyisocyanate obtained by oligomerization of at least one monomeric isocyanate, wherein the polyisocyanate contains isocyanurate-containing groups and is based on hexamethylene diisocyanate; (B) at least one hydroxyl-comprising poly(meth)acrylate polyol which is a copolymer of at least one (meth)acrylic ester and at least one hydroxyalkyl (meth)acrylate; (C) at least one hyperbranched polyester polyol, either obtained by polycondensation of at least one dicarboxylic acid A2 or at least one derivative thereof, optionally, at least one tri-functional or higher polyfunctional carboxylic acid Ax with x≧3, wherein x represents the number of carboxylic acid functional groups in carboxylic acid A, or at least one derivative thereof, and at least one tri-functional or higher polyfunctional alcohol By with y≧3, wherein y represents the number of hydroxyl groups in alcohol B, and also optionally, at least one diol B2, or obtained by polycondensation of at least one tri-functional or higher polyfunctional carboxylic acid Ax with x≧3, wherein x represents the number of carboxylic acid functional groups in carboxylic acid A, or at least one derivative thereof, optionally, at least one dicarboxylic acid A2 or at least one derivative thereof, and at least one diol B2, and optionally, at least one tri-functional or higher polyfunctional alcohol By with y≧3; wherein y represents the number of hydroxyl groups in alcohol B, and (D) at least one silicate particle with a size of 5 to 150 nm whose surface has been modified with an at least monoalkoxylated silyl compound (S),wherein
the ratio of isocyanate groups in (A) to isocyanate-reactive groups in (B) and (C) is 0.5:1 to 2:1, the weight ratio of (B):(C) is 50:1 to 1:20, the composition contains 0.5 to 50% by weight of (D), calculated as SiO2, based on the total weight of (A), (B) and (C), and the silyl compound (S) is a compound of formula (I)
(R1—O—)n—Si—R2(4-n) (I),wherein
R1 is C1 to C20 alkyl, R2 is an organic radical comprising 1 to 20 carbon atoms, and n is an integer from 1 to 3. |
