High-grade thermal recording sheet and a method of making the sa

Details High-grade thermal recording sheet and a method of making the sa High-grade thermal recording sheet and a method of making the sa

1989-10-23

1991-09-24

Hess, Bruce H.

Coating processes

Transfer or copy sheet making

Reactive components

427151, 427152, 503200, B41M 312, B41M 530

Patent

active

050512790

ABSTRACT:
A thermal recording sheet having on a support a thermal recording layer adapted for developing color when heated has an outermost surface layer formed by bringing it into contact with the surface of a smooth body when it is in a wet state, drying it and separating it from the surface of the smooth body. The sheet has a surface which is so smooth that when a first straight line extending in parallel to the centerline of a roughness curve as obtained in accordance with the method of JIS B0601 crosses the roughness curve with a contact ratio of 10%, a second straight line extending in parallel to the centerline and between it and the first straight line and having a distance of 1.5 .mu.m from the first straight line crosses the roughness curve with a contact ratio of at least 80%. The sheet is, therefore, easy to bring into intimate contact with a thermal head and is of high image quality and sensitivity. If the smooth body has a glossy or dull surface, it is possible to produce a thermal recording sheet having a uniformly glossy or dull surface without lowering its image quality of sensitivity.

REFERENCES:
patent: 4442179 (1984-04-01), Igarashi et al.
English Translation of "JIS-Japanese Industrial Standard Definitions and Designation of Surface Roughness"-JIS B 0601, International Search Report for PCT/JP87/00384.

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