Method for producing flexographic printing plate

Active Publication Date: 2015-11-26
TOYO TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024]In the method for producing a printing plate according to the present invention, the surface of a resin printing plate is treated with a treatment solution containing specific two kinds of amino-modified silicones whereby an excellent ability to prevent plate surface contamination and a persistency o

Problems solved by technology

As a result, even the area which is not the inherent pattern area may be printed resulting in deterioration of the printing quality.
When the ink is accumulated in the concaves of the printing plate in a predetermined amount or more, it transfers to the material to be printed to generate the dot bridging resulting in a significant deterioration of the printing quality.
Although some preventing effects for plate surface contamination are achieved by such a method, the plate surface contamination cannot be prevented in a halftone dot printing in high line numbers having

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example

Example 1

Preparation of Photosensitive Resin Composition

[0059]Butadiene latex (Nipol LX111NF containing 55% of non-volatile ingredients; manufactured by Nippon Zeon) (46 parts by mass) and 11 parts by mass of acrylonitrile-butadiene latex (Nipol SX1503 containing 43% of non-volatile ingredients; manufactured by Nippon Zeon); 11 parts by mass of oligobutadiene acrylate (ABU-4S manufactured by Kyoeisha Kagaku), 4.5 parts by mass of lauryl methacrylate (Light Ester L manufactured by Kyoeisha Kagaku) and 4.5 parts by mass of trimethylolpropane triacrylate (Light Ester TMP manufactured by Kyoeisha Kagaku) as photopolymerizable compounds; 0.6 part by mass of a photopolymerization initiator (Irgacure 651); and 12 parts by mass of a hydrophilic polymer (PFT-3 containing 25% of non-volatile ingredients, manufactured by Kyoeisha Kagaku) and 0.06 part by mass of hydroquinone monomethyl ether as other ingredients were mixed in a container to prepare a dope. The dope was poured into a pressurizing

Example

Examples 2 to 14 and Comparative Examples 1 to 5

[0064]The same operation as in Example 1 was conducted except that the composition of the amino-modified silicone in the treatment solution was changed as shown in Table 1 whereby a photosensitive resin composition, a flexographic printing original plate and a flexographic printing plate were prepared.

[0065]The printing plates of Example 1 to 14 and Comparative Examples 1 to 5 were evaluated for uneven application, surface tension, plate surface contamination and uniformity of ink in solid part in accordance with the following evaluating methods.

[0066](1) Evaluation of Uneven Application

[0067]Uneven application was evaluated by checking the uneven application of the solid part by naked eye using the produced printing plate. In case the uneven application was hardly confirmed at a glance, in case it was easily confirmed at a glance and in case viscous uneven application was clearly noted, they were marked as “∘”, “Δ” and “x”, respectively.

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Abstract

The present invention provides a method for producing a flexographic printing plate which has an ability to prevent plate surface contamination and a persistency of the effect thereof and which allows a high-quality printing in a large scale. There is disclosed a method for producing a flexographic printing plate from a flexographic printing original plate provided with a photosensitive resin layer comprising a photosensitive resin composition containing at least (A) a hydrophobic polymer comprising a water-dispersible latex, (B) a photopolymerizable compound and (C) a photopolymerization initiator, wherein the method comprises a main exposure step, a development step and a post-exposure step, characterized in that a treatment solution containing a first amino-modified silicone having an amine equivalent of 1000 g/mol or less and a second amino-modified silicone having an amine equivalent of 3000 g/mol or more in a mass ratio of from 2.5:1 to 1:6 is contacted with the whole surface of the flexographic printing plate.

Description

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Claims

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Application Information

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Owner TOYO TOYOBO CO LTD
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