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EP0366461A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Optical recording medium

Assignee: Nippon Paper Industries Co Ltd
•
Filing: 1989-10-26
•
Granted: —
•
Expires: 2009-10-26
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Abstract

Abstract An optical recording medium is in the form of a laminate of a base material, a heat-sensitive color-­developing and an intermediate underlayer together with an optical transparent protective layer superposed on the heat-sensitive color-developing layer, the underlayer containing a near infrared absorbent and the heat-sensitive color-developing layer containing a basic colorless dye and an organic developer. The near infrared absorbent may be a dispersible near infrared absorbent which absorbs a wavelength of 0.7 to 2.5 µm, and the dispersible near infrared absorbent is suitably graphite, copper sulfide, lead sulfide, black titanium or tri-iron tetroxide.

Inventors

  • 👤 Toshimi Central Research Laboratory Satake
  • 👤 Tomoaki Central Research Laboratory Nagai
  • 👤 Hiroshi Central Research Laboratory Fukui
  • 👤 Akio Central Research Laboratory Sekine

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 22:24
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/42; B41M5/46; B41M5/465; B41M5/30; B41M5/426; B41M5/44; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/145; Y10S430/146; Y10S430/165; Y10T; Y10T428/00; Y10T428/23; Y10T428/239

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 40 words
An optical recording medium comprising a laminate of a base material, a heat-sensitive color-­developing layer and an intermediate underlayer, the underlayer containing a near infrared absorbent and the heat-sensitive color-developing layer containing a basic colorless dye and an organic developer.
Claim 2
Dependent Claim 40 words
An optical recording medium comprising a laminate of a base material, a heat-sensitive color-­developing layer and an intermediate underlayer, the underlayer containing a near infrared absorbent and the heat-sensitive color-developing layer containing a basic colorless dye and an organic developer.
Claim 3
Dependent Claim 30 words
An optical recording medium according to claim 1, wherein the near infrared absorbent is a dispersible near infrared absorbent which absorbs light having a wavelength of 0.7 to 2.5 µm.
Claim 4
Dependent Claim 25 words
An optical recording medium according to claim 2, wherein the dispersible near infrared absorbent is graphite, copper sulfide, lead sulfide, black titanium or tri-iron tetraoxide.
Claim 5
Dependent Claim 24 words
An optical recording medium according to any one of claims 1 to 3, comprising also a transparent protective layer on the heat-sensitive color-­developing layer.
Claim 6
Dependent Claim 31 words
An optical recording medium according to any one of claims 1 to 4, wherein the underlayer or the transparent protective layer or the protective layer comprises a soluble near infrared absorbent.
Claim 7
Dependent Claim 20 words
An optical recording medium according to any one of claims 1 to 5, wherein the underlayer contains a hollow pigment.

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