The present invention has its object to provide a porous sheet material which is obtainable by wet coagulation of a polyurethane resin and is uniformly microporous and gives a feeling rich in flexibility.
The present invention provides a polyurethane resin for artificial leather manufacture which is obtained by reacting a high-molecular diol component (A) comprising a polycarbonate diol (a1) derived from an alkanediol containing 4 to 6 carbon atoms and a polycarbonate diol (a2) derived from an alkanediol containing 7 to 12 carbon atoms, an organic diisocyanate (B) and a chain extender (C), and which has the coagulation value of not lower than 2 but not higher than 5.
本发明的目的是提供一种多孔片状材料,该材料可通过聚
氨酯
树脂的湿法凝结获得,具有均匀的微孔,并给人以富有弹性的感觉。
本发明提供了一种用于人造革制造的聚
氨酯
树脂,它是由高分子二元醇组分(A)、有机二
异氰酸酯(B)和扩链剂(C)反应而得,高分子二元醇组分(A)包括由含 4 至 6 个碳原子的烷二醇衍生的聚
碳酸酯二元醇(a1)和由含 7 至 12 个碳原子的烷二醇衍生的聚
碳酸酯二元醇(a2),其凝结值不低于 2 但不高于 5。