Method of manufacturing heat sensitive recordng material and heat sensitive recording material
AssigneeJujo Thermal Oy
InventorsJouka Makitalo, Elina Mattila
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Abstract
The present invention relates to a method of manufacturing heat sensitive recording material for the bar code reader wavelength range of 660-690 nm, the recording material containing a base layer and a coating, and the coating containing at least a color former and a developer. The method of the invention is characterized in that the color former and the developer are selected so that when the reflectance of the color former-developer compound on the recording material is determined, it remains below a target curve determined with a function Hp=1.775*Ap22*10−61, where Hp is the reflectance percent and Ap the wavelength (nm) used in the bar code reader.
Claims4
A method of manufacturing heat sensitive recording material for a wavelength range of 660-690 nm of bar code readers, the recording material being composed of a base layer and a coating, the coating including at least color former and developer, characterized in that the color former and the developer are selected so that the color former-developer compound is composed of one of 3-(diethylamino)-6-methyl-7-(3-methylphenylamino)fluoran (ODB-7) as the color former and of one of 4,4′-sulfonyidiphenol (Bisphenol S), 4,4′-isopropylidenediphenol, and 4-hydroxy-4′-isopropoxydiphenyl-sulfone as the developer.
A heat sensitive recording material composed of a base layer and a coating, the coating including at least color former and developer, characterized in that the color former-deve!oper compound is composed of 3-(diethylamino)-6-methyl-7-(3-methylphenylamino)fluoran (ODB-7) as the color former and of one of 4,4′-sulfonyidiphenol (Bisphenol S), 4,4′-isopropylidenediphenol, and 4-hydroxy-4′-isopropoxydiphenyl-sulfone as the developer.
Dependencies are inferred from the claim text.