Patent ID: 11891491
Assignee: LINTEC CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B  G | IPC C  G

Claim 19:
20. A writing feel improving sheet comprising a base material and a writing feel improving layer with which a touch pen is brought into contact,
wherein in a state that a touch pen having a pen tip of 0.5 mm diameter brings the pen tip into contact with a surface of the writing feel improving layer and the touch pen is then linearly slid at a speed of 1.6 mm/second while applying a load of 200 g to the touch pen and maintaining an angle formed between the touch pen and the surface at 45°, a standard deviation of frictional force generated between the pen tip and the surface is 15 mN or more and 60 mN or less such that a feeling of vibration of writing on paper with a ballpoint pen is obtained,
wherein the frictional force is measured between a point at which a sliding distance is 10 mm and a point at which the sliding distance is 20 mm, and
wherein a number of projections having a height of more than 1 μm and less than 5 μm on a surface of the writing feel improving sheet on a writing feel improving layer side is 300 or less and 10 or more.