The present invention relates to two-component coating compositions containing
a) a polyisocyanate component,
b) an isocyanate-reactive component and
c) 0.1 to 20 wt. %, based on the weight of components a) and b), of a compound containing alkoxysilane groups and urea groups corresponding to the formula
1
wherein
X represents identical or different organic groups which are inert to isocyanate groups below 100° C., provided that at least one of these groups is an alkoxy group,
Y represents a linear or branched alkylene group containing 1 to 8 carbon atoms,
R represents the residue obtained by removing the isocyanate groups from a monoisocyanate or a polyisocyanate,
R
1
and R
2
are identical or different and represent organic groups which are inert to isocyanate groups at a temperature of 100° C. or less,
R
3
and R
4
are identical or different and represent hydrogen or organic groups which are inert to isocyanate groups at a temperature of 100° C. or less, and
n has a value of 1 to 6.
The present invention also relates to substrates coated with these coating compositions, in particular metal substrates.
本发明涉及包含以下组分的双组分涂料组合物:a)聚
异氰酸酯组分,b)
异氰酸酯反应性组分,以及c)占组分a)和b)重量的0.1至20重量%的含有烷氧基
硅烷基和
尿素基的化合物,该化合物对应于式1:其中X表示相同或不同的有机基团,这些基团在低于100℃的
异氰酸酯基团下是惰性的,但至少其中一个基团是烷氧基,Y表示含有1至8个碳原子的线性或支链烷基,R表示从单
异氰酸酯或多
异氰酸酯中去除
异氰酸酯基团得到的残基,R1和R2相同或不同,表示在100℃或以下温度下对
异氰酸酯基团惰性的有机基团,R3和R4相同或不同,表示氢或在100℃或以下温度下对
异氰酸酯基团惰性的有机基团,n的值为1至6。本发明还涉及用这些涂料组合物涂覆的基材,特别是
金属基材。