Cover film for hard copy printing paper

Abstract

Abstract 57 A cover film for hard copy printing paper, which is used in transfer-forming a colorless clear protection layer that inhibits the passage of ultraviolet rays onto the surface of a hard copy printing paper (4) such as color copy-printed paper obtained by transferring a transfer paper to which are applied sublimable dyestuffs onto a printing paper. The feature of the cover film resides in that at least a layer (2, 3) is formed on a substrate (1), the layer (2, 3) having a glass transition temperature of higher than 40°C, and a coefficient of water absorption of less than 2% (as evaluated in accordance with ASTMD 570 by immersing a film which is 0.01 in. thick in water at 23°C fo 24 hours). The protection layer formed by using the cover film of the present invention prevents adverse effects caused by the migration of dyestuffs of the printing paper under high-temperature and high-humidity conditions.

Inventors

• 👤 Yoshio Sony Chemicals Corporation Fujiwara
• 👤 Naotake Sony Chemicals Corporation Kobayashi
• 👤 Satoru Sony Chemicals Corporation Shinohara
• 👤 Tetsuya Sony Chemicals Corporation Abe

Bibliographic Details