Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-01-05
1999-11-23
Jagannathan, Vasu
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524539, 528282, 528283, 528289, 528298, 106 3115, 106 3132, 106 3164, C09D 1102, C08G 6316, C08G 6320, C08K 330
Patent
active
059901977
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
This invention relates to organic solvent based ink formulations suitable for ink jet printing by the piezoelectric impulse drop-on-demand (DOD) method and by using several available continuous ink jet printing systems, and which contain a suitable organic solvent and one or more polyesters having one or more copolymerized near infrared fluorophores dissolved therein.
It is desirable to provide intelligible markings that are virtually invisible to the human eye on the surface of articles for identification, authentication, sorting, etc. It is known to use near infrared fluorescent compounds which have minimal light absorption in the visible light wavelength range of about 400-700 manometers (nm) and which have strong light absorbance in the near infrared wavelength region of about 700-900 nm with accompanying fluorescence to produce fluorescent radiation having wavelengths longer than the wavelength of excitation (U.S. Pat. Nos. 5,093,147; 5,336,174; 5,423,432; 5,461,136).
Aqueous ink formulations for ink jet printing which contain at least one water-dissipatable sulfopolyester/amide containing near infrared fluorophore copolymerized therein have been reported in U.S. Pat. No. 5,614,008. These aqueous ink formulations are, unfortunately, only useful for printing onto porous cellulosic materials, such as, for example paper, wood, and the like. The aqueous formulations are slow to dry and are not suitable for printing on nonporous substrates, particularly glossy paper, glass, metal foils, metal sheeting, etc. The extended drying time may further result in the printed matter becoming smeared. Another disadvantage of the aqueous formulations is when these inks are printed on nonporous substrates, the printed markings do not sufficiently resist rubbing, scraping, scuffing, etc., to remain on the printed substrate. The disclosed sulfopolyester/amides containing copolymerized infrared fluorophores are not useful in formulating organic solvent base inks for ink jet printing because of their limited solubility in organic solvents.
U.S. Pat. No. 4,540,595 discloses a water-based ink which provides markings that fluoresce when exposed to light in the near infrared wavelength. The water-based ink is used to mark documents such as bank checks for automatic identification. The dyes used to make the ink are water-soluble, cationic phenoxazines (e.g. 3,7-bis(diethylamino) phenoxazonium nitrate is the preferred fluorescent material). These dyes are not invisible. They impart blue shades to the marked substrate and the inks are not suitable for printing on nonporous substrates. The dyes have limited solubility in organic solvents utilized in ink formulations.
U.S. Pat. No. 5,093,147 discloses infrared fluorescing inks which are useful for printing invisible markings on the surface of an article. The inks use known polymethine (cyanine) laser dyes. Although the dyes used provide invisible markings, the cyanine dyes, unfortunately, have the disadvantage of fading or decomposing upon brief exposure to ultraviolet light.
U.S. Pat. No. 3,630,941 discloses certain 16,17-dialkoxyviolanthrones (also called dibenzanthrones) to be useful as infrared fluorescent markers. However, they have a high molecular weight and at room temperature, have very limited solubility in solvents normally useful for preparing solvent based inks. These compounds also have significant absorption of light having wavelengths below 700 nm and, therefore, do not usually provide invisible markings.
Japanese Laid-Open Patent Application: Hei 3-79683 (Hanada, et al.) discloses ink formulations containing certain infrared absorbing naphthalocyanine compounds useful for printing bar codes and for identifying documents to prevent falsification and forgery. Various meltable waxes (e.g. Carnauba wax) and thermoplastic resins are used as vehicles in combination with alcohols and aromatic hydrocarbons to produce thermal transfer inks.
U.S. Pat. No. 5,336,714 discloses aqueous coating compositions containing about 20 weight percent to about 35 weight percent
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Escano Nelson Zamora
Krutak, Sr. James John
Weaver Max Allen
Davis Mark L.
Eastman Chemical Company
Graves, Jr. Bernard J.
Gwinnell Harry J.
Jagannathan Vasu
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