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Ink composition and method or printing ink

An ink composition and composition technology, applied in the direction of ink, printing, printing machine, etc., can solve problems such as limitations

Inactive Publication Date: 2021-07-16
XEROX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] While currently available ink compositions are suitable for their intended purposes, there remains a need for improved digital offset printing inks, especially digital offset printing inks that do not contain curable monomers such as ultraviolet (UV) curable monomers, where UV The risk of migration of ink components limits the use of such UV inks in applications such as food packaging

Method used

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  • Ink composition and method or printing ink
  • Ink composition and method or printing ink
  • Ink composition and method or printing ink

Examples

Experimental program
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Embodiment 1

[0115] Example 1: Synthesis of Highly Sulfonated Polyester (7.5 wt% Sulfonated)

[0116] A 5 gallon Parr reactor equipped with a mechanical stirrer, distillation apparatus and bottom drain valve was charged with dimethyl terephthalate (3.492 Kg), dimethyl-5-sulfoisophthalate sodium salt (940g), 1,2-propanediol (2.9kg), diethylene glycol (449g) and FASCAT 4100 (7.2g). The mixture was heated to 120°C under nitrogen flow (3 SCFH), after which stirring was started at 50 rpm. The mixture was then heated at 0.5°C / min for the next two hours until a temperature of 180°C was reached, during which time methanol by-product was collected in the distillation receiver. The mixture was then heated at 0.25°C / min until a temperature of 210°C was reached, during which time methanol and excess 1,2-propanediol were collected in the distillation receiver. Vacuum was then gradually applied until 4.4 mm-Hg was reached over a period of 1 hour at 210°C. The mixture was then repressurized to atmos...

Embodiment 2 to Embodiment 4

[0117] Embodiment 2 to embodiment 4: be formulated into DALI ink

[0118] Fluorescent pigments are added to the transparent matrix of water-based DALI inks in order to obtain corresponding fluorescent inks.

[0119] fluorescent ink

[0120]

[0121] To a 100 mL beaker equipped with a heating jacket and overhead mixer was added water, sulfolane and Dynwet 800. The solution was then sheared with a Cowles blade at 600 rpm, and branched sulfonated polyester (BSPE), a sulfopolyester prepared by a method similar to that in Example 1, was added to the beaker with Onset glass transition temperature of about 55°C, number average molecular weight of 1818 g / mole, weight average molecular weight of 3315 g / mole, and softening point of about 135°C. Once the polyester is fully dispersed (about 10 minutes) at room temperature (about 23°C), the vessel is heated to 85°C-90°C and shear is continued for 10-15 minutes. The mixture was cooled to image 3 , Figure 4 and Figure 5 middle. ...

Embodiment 5

[0123] Example 5: Testing Polyurethane-Containing Fluorescent Cyan DALI Ink on Lithographic Fixtures

[0124] The ink of Example 1 was tested in a DALI surrogate printing test jig ('Mimico') to assess the efficiency of ink transfer from the blanket under typical lithographic conditions. The anilox roll was filled with ink, transferred to the blanket, and then offset printed on SterlingGloss #80 paper, followed by a second offset event and a third offset event between the new paper and the previously inked blanket to monitor possible residues on the blanket ( 'Frame sheet') residual ink. The prints were then cured in an oven at 100°C for 5 minutes.

[0125] Figure 5 The offset printing results of the ink of Example 2 are shown. Although difficult to see due to the clear coat, the sample showed good ink transfer with no residual ink observed on the "frame" sheet. The stencil section of the print was probed with UV light and no ink residue was detected. The black that app...

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Abstract

The invention relates to an ink composition and a method of printing an ink. Embodiments of the present disclosure relate to an ink composition. The ink composition comprises at least one water-dissipative sulfonated polyester, at least one polymeric additive, at least one colorant selected from the group consisting of photochromic colorants and fluorescent colorants, at least one surfactant, at least one humectant, and water.

Description

[0001] A detailed description technical field [0002] The present disclosure relates to ink compositions and methods for printing inks. Background technique [0003] Typical lithographic and offset printing techniques use permanently patterned plates and are therefore only useful when printing numerous copies of the same image such as magazines, newspapers, and the like. Variable data digital lithography (also referred to herein as digital offset lithography) has been developed as a system using a non-patterned reimageable surface that is initially uniformly coated with a layer of damping fluid. Areas of damping fluid are removed by exposure to a focused radiation source (eg, a laser light source) to form dimples. Thus, a temporary pattern in the damping fluid is formed over the non-patterned reimageable surface. Ink applied thereon remains in the dimples formed by the removal of the damping fluid. The inked surface is then brought into contact with a substrate such as p...

Claims

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Application Information

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IPC IPC(8): C09D11/104C09D11/03C09D11/50B41M1/06
CPCB41M1/06C09D11/03C09D11/104C09D11/50C09D11/037C09D11/106B41M3/14B41M5/025B41F7/02C08G63/916C09D11/107
Inventor R·克拉里奇N·乔普拉B·E·亚伯拉罕
Owner XEROX CORP
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