申请人:Mitsubishi Polyester Film Corporation
公开号:EP0300060A1
公开(公告)日:1989-01-25
57 A polyester film containing fine cells is obtained by extrusion-molding into sheet a composition comprising aromatic polyester, 3 to 20 wt %, based on the polyester, of crystalline polypropylene having a melt-flow index of 0.2 to 120, and 0.001 to 3 wt %, based on the sum of the amount of the polyester and that of the polypropylene, of a surfactant, and stretching the sheet in at least one direction. Since this polyester film contains innumerable fine closed cells, it has a small apparent specific gravity and shows a large hiding power when titanium oxide is added thereto in only a small amount or even not added, thus being preferably utilized as base materials for various products in plate-making or information industry.
57 一种含有细孔的聚酯薄膜是通过将芳香族聚酯、3-20 wt %(以聚酯为基准)熔融流动指数为 0.2-120 的结晶聚丙烯和 0.001-3 wt %(以聚酯量和聚丙烯量之和为基准)表面活性剂组成的组合物挤压成型为薄片,然后将薄片沿至少一个方向拉伸而得到的。由于这种聚酯薄膜含有无数细小的闭合细胞,其表观比重较小,在只添加少量甚至不添加氧化钛的情况下显示出较强的遮盖力,因此最好用作制版或信息产业中各种产品的基材。