Color developer, recording unit having a layer of the color developer and process for production thereof
OwnerTakao Hayashi, Hajime Kato +2inventors
InventorsTakao Hayashi, Hajime Kato, Akio Miyamoto, Makoto Yoshida
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Abstract
A color developer containing a combination of zinc oxide, at least one salicylic acid or nuclear substituted salicylic acid, and at least one metal silicate as an inorganic pigment, and a recording unit having a layer of the color developer. The color developer has a high developing ability and is capable of forming a distinct color having a high light resistance when it is contacted with a color former.
Claims12
A color developer capable of forming a distinct color when contacted with a color former, comprising zinc oxide, at least one acid selected from the group consisting of salicylic acid and nuclear substituted derivatives thereof and at least one metal silicate as an inorganic pigment in an amount sufficient to increase the color developing ability and light resistance of the color developer, said acid being present in an amount of about 1 to 100 parts by weight per 100 parts by weight of zinc oxide.
A process for producing a color developer which comprises dissolving or dispersing zinc oxide, at least one acid selected from the group consisting of salicylic acid and nuclear substituted derivatives thereof and at least one metal silicate as an inorganic pigment in an organic solvent, the amount of said acid in the developer being 1 to 100 parts by weight per 100 parts by weight of zinc oxide and the amount of said metal silicate being sufficient to increase the color developing ability of the color developer and the light fastness of the color formed after reaction with a color former.
Dependencies are inferred from the claim text.