| 摘要 |
PROBLEM TO BE SOLVED: To provide a process of preparing a plurality of thin films at once by adopting a specific process, the film being so thin that the conventional industrial processes for forming resinous thin films could have hardly prepared it. SOLUTION: A plurality of thin films composed of a substantially insoluble resin are prepared at once by dissolving selectively the well-soluble resin layers of a multilayer resin molded form, which is composed of at least two resins comprising at least one resin that is well-soluble in a solvent and at least one resin that is substantially insoluble in the solvent, has two main surfaces, and is prepared by laminating the at least two resins aslant to the two surfaces and repeatedly in at least one cross-section that intersects perpendicularly to the two surfaces. The multilayer resin molded form can be obtained preferably by using a spiral die. The angleθ( deg.C) with the two main surfaces 1a and 1b is generally in the range of from 0 deg. to 4 deg.. The dissolution of the well-soluble resin layers is carried out by dipping in the solvent or by spreading, applying or spraying the solvent. |
