| 摘要 |
PURPOSE:To enhance the density of protrusions on the surface of a base film and to make the heights of the protrusions uniform by specifying the average particle size of inactive particles and the content of the particles in the laminated film of polyester. CONSTITUTION:The average particle size of inactive particles and the thickness of a laminated film of polyester A containing the particles are 0.1-100 times, and the content of the particles in the laminated film of the polyester A is 0.01-10wt.%. If the average particle size/film thickness ratio is smaller than this range, the heights of the protrusions formed on the surface becomes irregular, and the strength of the surface becomes improper. On the contrary, if they are larger, the surface strength becomes improper not to be desirable. Thus, the density of the protrusions on the surface of the film can be enhanced, and the heights of the protrusions can be made uniform. |
