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Aqueous Polyisocyanate Crosslinking Agents Modified with Hydroxycarboxylic Acids and Pyrazole-Based Blocking Agents
Aqueous Polyisocyanate Crosslinking Agents Modified with Hydroxycarboxylic Acids and Pyrazole-Based Blocking Agents
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机译:羟基羧酸和吡唑基封闭剂改性的聚异氰酸酯交联剂
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摘要
Aqueous or water-dilutable blocked polyisocyanate (I) consists of: (a) 100 equivalent-% polyisocyanate component, (b) 60-85 equivalent-% pyrazole compound as blocking agent, (c) 15-40 equivalent-% monohydroxycarboxylic acid to give hydrophilic properties and (d) 0-15 equivalent-% difunctional chain extender with hydroxyl (OH) and/or amino groups. The ratio of isocyanate (NCO) groups in (a) to NCO-reactive groups in (b), (c) and (d) is 1:(0.8-1.2). An Independent claim is also included for the preparation of (I).
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