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Flexographic developers and methods of use

A flexographic plate and developer technology, applied in the field of relief images, can solve the problems of stamp printing defects, reduced solubility and the ability to form micelles, etc., and achieve the effect of environmental toxicity

Pending Publication Date: 2019-09-03
MIRACLON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Depending on the particular ratio of saturated and unsaturated fatty acids, this composition (also known as "soap") may not sufficiently "develop" the exposed flexographic printing master, leaving debris on the resulting flexographic printing plate , leading to severe printing defects in the resulting stamp
[0010] Furthermore, it has been found that as the pH of such aqueous developers becomes more acidic with continued use, the fatty acids incorporated therein convert from their basic (ionic) form to their acidic form and their Severely reduced solubility and ability to form micelles

Method used

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  • Flexographic developers and methods of use
  • Flexographic developers and methods of use
  • Flexographic developers and methods of use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0240] A flexographic developer concentrate according to the invention is prepared by reacting a mixture of fatty acids with potassium hydroxide. The pH was adjusted to 10.6 and water was added to bring the solids concentration to 21 wt%. The final flexographic developer concentrate has the following components and amounts:

[0241] Palmitic acid 0.04％ stearic acid 0.46％ Oleic acid 15.77％ Linoleic acid 1.24％ Linolenic acid 0.02％ Potassium hydroxide 3.48％ water 79.00％

[0242] 1 part of this concentrate was diluted with 42 parts of water to provide an aqueous flexographic developer having a total fatty acid and fatty acid salt concentration of 0.5% by weight and a pH of 10.5. The resulting aqueous flexographic developer was placed in a track processor unit as described in Comparative Example 1 above and used to process the exposed flexographic printing plate. The amount of debris on the treated flexographic printing plates w...

Embodiment 2

[0243] A flexographic developer concentrate according to the invention is prepared by reacting a mixture of fatty acids with potassium hydroxide. Potassium carbonate was added and the pH was adjusted to 10.6. Water was added to bring the solids concentration to 21 wt%. The final flexographic developer concentrate has the following components and amounts:

[0244] Palmitic acid 0.03％ stearic acid 0.33％ Oleic acid 11.19％ Linoleic acid 0.88％ Linolenic acid 0.01％ Potassium hydroxide 2.47％ potassium carbonate 6.09％ water 79.00％

[0245] 1 part of the resulting flexographic developer concentrate was diluted with 42 parts of water to provide an aqueous flexographic developer having a total fatty acid and fatty acid salt concentration of 0.5% by weight and a pH of 10.5.

[0246] As described in Comparative Example 1 above, an aqueous flexographic developer was placed in a track processor unit and used to process the exposed fl...

Embodiment 3

[0248] A flexographic developer concentrate according to the invention is prepared by reacting a mixture of fatty acids with potassium hydroxide. Potassium carbonate and EDTA disodium salt were added and the pH was adjusted to 10.6. Water was added to bring the solids concentration to 21 wt%. The final flexographic developer concentrate has the following components and amounts:

[0249] Palmitic acid 0.02％ stearic acid 0.29％ Oleic acid 10.00％ Linoleic acid 0.79％ Linolenic acid 0.01％ Potassium hydroxide 2.21％ potassium carbonate 5.44％ EDTA disodium salt 2.25％ water 79.00％

[0250] 1 part of the resulting flexographic developer concentrate was diluted with 42 parts of water to provide an aqueous flexographic developer having a total fatty acid and fatty acid salt concentration of 0.5% by weight and a pH of 10.5.

[0251] As described in Comparative Example 1 above, an aqueous flexographic developer was placed in a ...

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Abstract

Flexographic printing members are prepared by developing an exposed flexographic printing member precursor with an aqueous flexographic developer. The aqueous flexographic developer comprises: a) a fatty acid composition consisting of one or more saturated or unsaturated fatty acids or alkali metal salts thereof, each saturated or unsaturated fatty acid or alkali metal salt thereof independently having 12 to 20 carbon atoms, the fatty acid composition being present in an amount of 0.25-2.0 weight %, and at least 85 weight % of the fatty acid composition is composed of one or more C18 mono- orpoly-unsaturated fatty acids or alkali metal salts thereof; b) an aminopolycarboxylic acid or alkali metal salt thereof in an amount of 0.05-0.30 weight %; c) a buffer compound in an amount of 05-0.60weight %; and d) water. Such aqueous flexographic developers can also be provided in concentrated form and appropriately diluted before or during use.

Description

[0001] field of invention [0002] The present invention relates to working strength aqueous flexographic developers and flexographic developer concentrates and their use to provide relief images in imagewise exposed flexographic printing precursors. These developer compositions comprise one or more saturated or unsaturated fatty acids or alkali metal salts thereof, at least one unsaturated C 18 Fatty acids (or alkali metal salts thereof) predominate; aminopolycarboxylic acids or salts thereof; and buffer compounds. The use of these compositions reduces the amount of residual debris on the treated flexographic printing member, particularly when using a flexographic printing plate precursor which exhibits a resistance of at least 5 g / cm relative to the masking element in intimate contact with it. Controlled release force. [0003] Background of the invention [0004] Production of relief images for flexographic printing is generally carried out by image-wise exposing the photo...

Claims

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Application Information

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IPC IPC(8): G03F7/32
CPCG03F7/32G03F7/322
Inventor R·R·小欧乐曼E·A·富伦卡姆F·C·梅勒玛M·Z·阿里
Owner MIRACLON CORP
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