| 摘要 |
PURPOSE:To obtain the title sheet which has many interconnected micropores and can be produced economically by selecting the title sheet prepared by using a hydrophobic polyurethane so that it may be porous. CONSTITUTION:The title sheet is prepared by using a hydrophobic polyurethane (e.g. polyether polyurethane) so that it may be porous and desirably prepared from an O/W polyurethane emulsion comprising a hydrophobic polyurethane, a surfactant (e.g. W/O emulsifier), an organic solvent (e.g. methyl ethyl ketone and toluene) and water. |
