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US 5,616,447 AGranted
Optical disc having printable label layer
AssigneeTDK Corporation
InventorHiroyuki Arioka
Life of this patent
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Abstract
In an optical disc, a first cover layer comprising a filler and a binder is formed on a protective coat, and a second cover layer of at least 0.1 .mu.m thick comprising at least 80% by weight of vinyl pyrrolidone polymer having Mw.gtoreq.30,000 is formed on the first cover layer. The second cover layer is printable with water-based ink. There is obtained an optical disc having a label surface which is printable with water-based ink to form characters and images which are erasable for correction.
Claims9
An optical disc comprising
- an optical disc body,
- a protective coat on the disc body,
- a first cover layer on the protective coat comprising a filler and a binder, and
- a second cover layer on the first cover layer comprising at least 80% by weight of vinyl pyrrolidone polymer having a weight average molecular weight Mw of at least 30,000, said second cover layer having a thickness of at least 0.1 .mu.m and being printable with water-based ink.
1 more element
Dependencies are inferred from the claim text.