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发明公开
CN105392850A 在水性底涂层中用作粘合促进剂的α,ω-羟基官能化低聚酯 有权

在水性底涂层中用作粘合促进剂的α,ω-羟基官能化低聚酯
摘要：
本发明涉及一种着色水性底涂层材料，其含有至少一种α,ω-羟基官能化低聚酯，后者具有25-95mgKOH/g的羟值，理论碳-碳双键含量为0.5-2.5mmol/g，数均分子量为2500-6000g/mol且重均分子量为15000-30000g/mol，所述α,ω-羟基官能化低聚酯还含有至少一个被部分或完全盐化的酸基团，和其中所有α,ω-羟基官能化低聚酯的重量百分比总和是0.5-10重量％，基于着色水性底涂层中的总固体量计。本发明还涉及多层涂层和制备多层涂层的方法。本发明还涉及上述α,ω-羟基官能化低聚酯在着色水性底涂层中用于改进粘合性的用途。
摘要（英）：

The invention relates to a pigmented aqueous base coat containing at least one alpha,omega-hydroxyl-functionalised oligoester with a hydroxyl number of 25 to 95 mg KOH/g, a theoretical carbon-carbon double bond content of 0.5 to 2.5 mmol/g, a number-average molecular weight of 2500 to 6000 g/mol and a weight-average molecular weight of 15000 to 30000 g/mol, said alpha,omega-hydroxyl-functionalised oligoester also containing at least one partially or wholly salted acid group, and wherein the sum of the weight-percentages of all the alpha,omega-hydroxyl-functionalised oligoesters is 0.5 to 10 wt.% based on the total amount of solids in the pigmented aqueous base coat. The invention further relates to a multilayer coating and to a process for producing a multilayer coating. The invention also relates to the use of the above-designated alpha,omega-hydroxyl-functionalised oligoester in pigmented aqueous base coats to improve adhesion.

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