Flexographic printing process with wet on wet capability

Inactive Publication Date: 2011-10-13
TECHNOSOLUTIONS ASSESSORIA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]It is an object of this invention to provide a flexographic printing system and process with the overprint color process without solvent or with a reduced

Problems solved by technology

The controlled gel results from formation of a polymer chain network, or polymer segment

Method used

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  • Flexographic printing process with wet on wet capability
  • Flexographic printing process with wet on wet capability
  • Flexographic printing process with wet on wet capability

Examples

Experimental program
Comparison scheme
Effect test

Example

Example 1

Ink with Small Amount of Solvent

[0184]Formula A is for an EB curable ink formulated according to the present invention for a non-food application that contains only 5% solvent and 0.5% of Polymer (Polyvinyl Butyral-Butvar® B76): Formula A is showed on Table 4 below.

TABLE 4ink with small amount of solventFORMULA AProductTrade NameSupplierYellowMagentaCyanBlackAdditiveOmnistab 510IGM Resins0.50.50.50.5AdditiveTego Glide 432Tego Chemie1.01.01.01.0AdditiveTego Dispers 685Tego Chemie4.02.5——AdditiveDisperbyk 168Altana3.05.56.55.0MonomerTMPTACytec51.051.051.048.5MonomerHDDACytec5.05.05.04.5Epoxidized SoyCN111Sartomer5.56.06.06.0Bean Oil AcrylateAdditiveSolsperse 22000Noveon2.0———AdditiveSolsperse 5000Noveon——1.52.0Yellow PigmentIrgalite Yellow LCTCIBA22.5———Magenta PigmentPermanent Rubine L4B 01Clariant—23.0——Cyan PigmentHeliogen LBL 7081DBASF——23.0—Black PigmentSpecial Black 250Degussa———27.0PolymerButvar B76Solutia0.50.50.50.5SolventDowanol PMDow5.05.05.05.0Viscosity (cps)15001...

Example

Example 2

Ink with Increased Amount of Polymer

[0203]In example 2, the amount of polymer was increased, that means a elevation in the polymer network density and in the amount of change in the Hansen Solubility Parameter, in order to ensure a sufficient distance between the liquid and gel state, avoiding ink gelation in the inking system. Table 7 shows Formula B.

TABLE 7FORMULA BProductTrade NameSupplierQuantityAdditiveOmnistab 510IGM Resins0.50.50.50.5AdditiveTego Glide 432Tego Chemie1.01.01.01.0AdditiveTego Dispers 685Tego Chemie4.02.5——AdditiveDisperbyk 168Altana3.05.56.55.0MonomerTMPTACytec46.546.546.544.0MonomerHDDACytec3.03.03.02.5Epoxidized SoyCN111Sartomer5.56.06.06.0Bean Oil AcrylateAdditiveSolsperse 22000Noveon2.0———AdditiveSolsperse 5000Noveon——1.52.0Yellow PigmentIrgalite Yellow LCTCIBA22.5———Magenta PigmentPermanent Rubine L4B 01Clariant—23.0——Cyan PigmentHeliogen LBL 7081DBASF——23.0—Black PigmentSpecial Black 250Degussa———27.0PolymerButvar B76Solutia2.02.02.02.0SolventDow...

Example

Example 3

Composition Approved for Food Packing

[0212]Using the same general formulation principle, but using only FDA approved monomer for Food Packing, the previous formulations is changed by exchanging HDDA with TRPGDA (Tripropylene Glycol Diacrylate).

[0213]In both case, the use of HDDA and / or TRPGDA is directed to bring the TMPTA as close as possible to the solubility border of Butvar® B76 in order to reduce as much as possible the Methoxy Propanol (Dowanol PM) level in the ink, since after its evaporation there is an adverse effect of VOLATILE ORGANIC COMPOUNDS in the atmosphere. Table 10 below shows formula C:

TABLE 10gelled ink with small amount of solventFORMULA CProductTrade NameSupplierQuantityAdditiveOmnistab 510IGM Resins0.50.50.50.5AdditiveTego Glide 432Tego Chemie1.01.01.01.0AdditiveTego Dispers 685Tego Chemie4.02.5——AdditiveDisperbyk 168Altana3.05.56.55.0MonomerTMPTACytec37.537.537.536.5MonomerTRPGDACytec12.012.012.011.0Epoxidized SoyCN111Sartomer5.56.06.06.0Bean Oil Acr...

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Abstract

The invention refers to a flexographic printing process with wet on wet capability based on controlled polymer or polymer segment precipitation that leads to gel formation of ink compounds by controlling the solubility parameter of the ink system. The mechanism to obtain a desirable wet on wet color trapping is the formation and/or presence of a gel in the applied ink film due to a controlled physicochemical mechanism of resin precipitation. This is accomplished either by controlling a change in the Hansen Solubility Parameter of the liquid in the ink through evaporation of some or all of a non-reactive and volatile solvent, or alternatively by use of a polymer comprised of two distinct and separate segments one of which is soluble in the monomer/oligomer mix and the other of which is not. The insoluble segments form a reversible gel that is broken to a liquid by shear in the application process, allowing application of a liquid ink, and is reestablished in the applied ink film in such a manner and with such strength as to allow overprinting in the wet on wet flexographic printing process.

Description

FIELD OF THE INVENTION[0001]This invention concerns to a flexographic printing process with wet on wet capability that is made possible by controlled gel formation based on precipitation of a polymer or segments thereof in ink formulations, causing formation of a gel with suitable mechanical strength to allow the required color trapping for a wet on wet flexographic printing process. This controlled precipitation is accomplished by controlling the Hansen Solubility Parameter of the ink system at all times. The wet on wet printing process is possible with or without intermediate air drying, with greatly reduction or no emission of VOLATILE ORGANIC COMPOUNDS (VOC), greatly reduced use of energy, and with a single final curing step by UV or EB radiation. The invention also concerns an ink and a printing apparatus for carrying out the process. The process is also suitable for letterpress printing.BACKGROUND OF THE INVENTION[0002]Flexographic printing has become the major printing proces...

Claims

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Application Information

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IPC IPC(8): B41F5/24C09D11/10C08K5/01C08K5/10C08K5/07B41F23/04C08K5/06
CPCB41F5/24B41F23/0409B41F35/04B41M1/04C09D11/107C09D11/02C09D11/101B41F31/027B41M1/18B41M7/0081C09D11/03
Inventor BAPTISTA, VALTER MARQUESPADUAN, WILSON ANDRADE
Owner TECHNOSOLUTIONS ASSESSORIA
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