| 摘要 |
Disclosed is a coating composition based on aprotic solvents and comprising at least one hydroxyl-containing compound (A) and at least one compound (B) having isocyanate groups and having at least one silane group of the formula (I)
—X—Si—R″xG3-x (I)
with
G=identical or different hydrolyzable groups,R′=hydrogen, alkyl or cycloalkyl,X=organic radical,R″=alkyl, cycloalkyl, aryl or aralkyl,x=0 to 2,
and characterized in that
(i) the compound (B) containing isocyanate groups and silane groups comprises uretdione groups, and(ii) the compound (B) has been prepared from a linear aliphatic diisocyanate.;The present invention additionally provides multistage coating methods using these coating compositions, and the use of the coating compositions as clearcoat, and application of the coating method for automotive refinish and/or for the coating of plastics substrates. |
| 主权项 |
1. A coating composition based on aprotic solvents and comprising
at least one oligomeric and/or polymeric, hydroxyl-containing compound (A) and at least one compound (B) comprising isocyanate groups, and at least one silane group of the formula (I)
—X—Si—R″xG3-x (I) with G=identical or different hydrolyzable groups having a substituent R′, R′=hydrogen, alkyl or cycloalkyl, it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur or NRa groups, with Ra=alkyl, cycloalkyl, aryl or aralkyl, X=organic radical, R″=alkyl, cycloalkyl, aryl or aralkyl, it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur or NRa groups, with Ra=alkyl, cycloalkyl, aryl or aralkyl, x=0 to 2, and characterized in that (i) the compound (B) containing isocyanate groups and silane groups comprises uretdione groups, and (ii) the compound (B) has been prepared from a linear aliphatic diisocyanate (DI). |
