A method of preparing a storage-stable one-part reactive liquid thermal curing polymeric coating composition from an isocyanate-functional polymeric compound which has a substantial portion of its isocyanate groups masked with an isocyanate masking agent, and a crosslinking agent which is substantially insoluble in aprotic solvents. These liquid compositions are homogeneous even when free of solvents. Preferably the crosslinking agent is a crystalline polyol. The method involves the synthesis of a solubilizing oligomer which is formed by the partial reaction of the crosslinking agent and the unmasked isocyanate-functional polymeric compound. The thermal curing of these compositions results in polymeric coatings which possess superior physical properties. These cured coatings are particularly useful in the manufacture of retroreflective sheeting.
一种制备贮存稳定的单组分反应性液态热固化聚合物涂料组合物的方法,该组合物由
异氰酸酯官能团聚合物化合物和
交联剂制备而成,
异氰酸酯官能团聚合物化合物的大部分
异氰酸酯基团已被
异氰酸酯掩蔽剂掩蔽,而
交联剂基本上不溶于烷基溶剂。即使不含溶剂,这些液体组合物也是均匀的。
交联剂最好是结晶多元醇。该方法包括合成增溶低聚物,该低聚物由
交联剂和未掩蔽的
异氰酸酯功能聚合物化合物部分反应形成。这些组合物经热固化后可形成具有优异物理性能的聚合物涂层。这些固化涂层尤其适用于制造反光片。