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Gallotannic compounds for lithographic printing plate coating compositions

一种平版印刷版、化合物的技术，应用在平版印刷设备、印刷、印刷工艺等方向，能够解决图象浮散、降低机械强度等问题

Inactive Publication Date: 2012-05-30
MYLAN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It also reduces mechanical strength and causes image blooming during storage

Method used

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  • Gallotannic compounds for lithographic printing plate coating compositions
  • Gallotannic compounds for lithographic printing plate coating compositions
  • Gallotannic compounds for lithographic printing plate coating compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0313] Synthesize as follows figure 2 Shown gallotannin compound RGT-01: 155 grams of methacrylic acid-2-isocyano group in 500 grams of anhydrous 1,3-dioxolane will be added to 500 grams of anhydrous 1,3-dioxolane under 50°C, oxygen atmosphere and continuous stirring. The ethyl ester (10 equivalents) was added to a reaction flask containing 800 grams of anhydrous 1,3-dioxolane, in which 170.1 grams of gallotannin (1 equivalent) and 0.5 grams of dibutyl tin dilaurate were dissolved. After 30 hours of reaction, a sample of the reaction mixture was taken out of the reaction flask. The FTIR spectrum recorded on the KBr disc did not show a -N=C=O peak at 2274 cm-1, which indicated that the reaction was completed. 1,3-Dioxolane was used to adjust the solid content of RGT-01 to 20% by weight.

Embodiment 2

[0315] Synthesize as follows image 3 Shown gallotannin compound RGT-02: Under a nitrogen atmosphere and continuous stirring, slowly add 42.0 grams of sodium hydride (10.5 equivalents) to the reaction flask containing 500 grams of anhydrous N,N-dimethylacetamide , In which 170.1 grams of gallotannin are dissolved. After about 3 hours, the hydrogen by-product stopped releasing, and a solution containing 300 grams of N,N-dimethylacetamide and 209 grams of MMEA (10 equivalents) was slowly added to the reaction mixture. The reaction was stopped after 10 hours at 50°C. The solvent was removed under vacuum using a rotary evaporator until dry. The obtained solid was dissolved in anhydrous 1,3-dioxolane to provide a 20% solid solution. Then it was gravity filtered to remove the sodium chloride by-product.

Embodiment 3

[0317] The Gallo-25X was synthesized by the following: At 57° C., under an oxygen atmosphere and continuous stirring, 150 g 1,3-dioxolane solution containing 37.4 g NCO-0747 was slowly added to 100 g 1,3-dioxolane Ring, 17.0 grams of gallotannin, and 0.1 grams of dibutyl tin dilaurate. After 5 hours of reaction, the sample was taken out of the reaction for FTIR analysis. At 2210cm -1 The -NCO stretch band disappears, which means the reaction is complete. The solution was adjusted with 1,3-dioxolane to obtain 20% solids weight, which is a solution ready to be used for coating the plate. The ideal chemical structure of Gallo-25X is Figure 4 Shown. Gallotannins with initiator

[0318] Initiator for hot plate

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Abstract

There is provided a gallotannic compound, a method of producing a gallotannic compound, a lithographic printing plate coating composition, a lithographic printing plate, a method of producing a lithographic printing plate and a method of printing.

Description

Invention field [0001] The invention relates to a lithographic printing plate and its coating. More particularly, the present invention relates to gallotannins and gallotannin compounds and their use in coating compositions for lithographic printing plates. Background of the invention [0002] In lithographic printing, the printing plate is installed on the drum of the printing press. The printing plate carries a lithographic image on its surface and a printed copy is obtained by applying ink to the image, and then transferring the ink from the printing plate to a printing material (typically paper). Generally, the ink is first transferred to an intermediate blanket, which in turn transfers the ink to the surface of the printing material (offset printing). [0003] In conventional so-called "wet" lithography, the ink and water-containing dampening solution (also called fountain solution) are supplied from lipophilic (or hydrophobic, that is, ink-receiving, waterproof) areas and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07G3/00B41C1/10G03F7/12C09K23/00
CPCG03F7/022G03F7/027C07D309/10C07H13/08G03F7/038B41C1/1008B41C2210/02B41C2210/04B41C2210/08B41C2210/22B41C2210/24C07G3/00B41C1/10G03F7/12
Inventor M·T·阮A·K·潘Q·K·阮M-A·罗卡斯
Owner MYLAN GRP
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