Water-based screen printing ink - Pharos Project .Water-based screen printing ink composition according

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    Publication number WO2003020835 A1Publication type ApplicationApplication number PCT/EP2002/009132Publication date Mar 13, 2003Filing date Aug 15, 2002Priority date Aug 28, 2001

    Also published as CA2457864A1, CA2457864C, 7 More 7More

    Inventors Aline Menoud, Patrick Veya

    Applicant Aline Menoud, Sicpa Holding Sa, Patrick Veya

    Export Citation BiBTeX, EndNote, RefMan

    Patent Citations (3), Non-Patent Citations (1), Referenced by (5),Classifications (5), Legal Events (13)

    External Links: Patentscope, Espacenet

    CLAIMS (OCR text may contain errors)

    Claims :

    1. Water-based screen printing ink composition having

    (a) an acrylic or urethane-acrylic copolymer emulsion;

    (b) a crosslinker;

    (c) optionally a catalyst;

    (d) optionally pigments; and

    (e) optionally additives, characterized in that said crosslinker comprises atleast two different chemical functionalities within the same molecule, whereina first of said functionalities is chosen such as to form a covalent link withsaid polymer prior to printing and a second of said functionalities is selectedto effect crosslinking of said polymer to cure the printed ink and that theacrylic or urethane-acrylic copolymer emulsion is selected from the grouphaving self-crosslinking properties .

    2. Water-based screen printing ink composition according to claim 1 whereinthe acrylic or urethane-acrylic copolymer emulsion is alkali soluble.

    3. Water-based screen printing ink composition according to one of theclaims 1 or 2 characterized in that the acrylic or urethane-acrylic copolymerhas a Tg value in the temperature range between -10 and 50 C.

    4. Water-based screen printing ink composition according to one of theclaims 1 to 3 wherein the acrylic or urethane- acrylic copolymer emulsion hasa acid number between 10 and 90 mg KOH/g, preferably between 15 and 75mg KOH/g.

    5. Water-based screen printing ink composition according to one of theclaims 1 to 4 characterized in that the acrylic or urethane-acrylic copolymeremulsion has a solid content of 35 to 55 % by weight of the emulsion.

    6. Water-based screen printing ink composition according to one of theclaims 1 to 5 characterized in that the said crosslinker is chosen from the

    Water-based screen printing inkWO 2003020835 A1

    ABSTRACT

    The invention relates to a water-based screen, flexo or gravure printing inkcomposition, to a method of manufacturing said ink composition, to the use of saidink composition for screen, flexo or gravure printing, and to value documentsprinted with said ink composition.

    DESCRIPTION (OCR text may contain errors)

    Water-based screen printing ink

    The invention relates to a water-based screen printing ink composition, to amethod of manufacturing said ink composition, to the use of said ink compositionfor screen printing, and to value documents printed with said ink composition.

    Printed security documents, such as bank notes or similar value documents mustbe resistant against physical and chemical environment influence (Interpol

    Resolution No AGN/67/RES/11 of the 67th Session - Cairo, 1998; Interpol

    Resolution No 8 of the 5th International Conference on Currency Counterfeiting -Mexico, 1969). According to the art, particular varnish formulations are used tofulfill these stringent resistance requirement in the case of Intaglio, Letterpress orOffset inks.

    For the application of special pigments, such as optically variable pigments of thevarious types known in the art, iridescent pigments, or still other optical effectpigments, screen-printing has recently been introduced to security- documentprinting as the most appropriate application mode for those pigments. Screen-printing inks must be formulated which cope on one hand with the requirements ofindustrial screen- printing equipment, and which have, on the other hand, therequired resistance values.

    Industrial screen-printing is performed on either rotary screen printing or flat-bedscreen printing machines. Due to the high printing speeds in these printing

    processes (5 '000 - 12000 sheets/hour or 100 - 150 m/min) the curing of the inkis a relevant step in these printing processes. Rotary screen printing processesrequire a different type of ink composition than flat -bed screen printing processes,mainly due to the different ways of supplying the ink to the printing process.Therefore, the ink formulation has to be adjusted or selected with respect to thedifferent printing machine conditions. Due to environmental, health and safetyreasons, water-based screen printing ink formulations are preferred over volatile-organic-solvent containing formulations.

    According to the art, a two-component (2C) water-based ink is normally used toachieve the required chemical and physical resistance. Acrylic or polyurethaneresin emulsions (water- borne emulsions) or solutions are used to prepare suchscreen- printing inks. A crosslinking agent (in amounts up to 0.5-3%) must alwaysbe added before printing, in order to achieve the required resistance. Theuniversal and well-known crosslinking agent (crosslinker) CX-100 fromNeoResins/Avecia (former Zeneca) is generally used in water-based formulations.

    Find prior art Discuss this application

    Find prior art Discuss this application

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    English

    +Melissa Sharewater based inks gravure

    https://www.google.com/patentshttps://www.google.com/patents/CA2457864A1?dq=water+based+inks+gravure&ei=VifpU7fGLNG2yATNpYHwCQ&cl=enhttps://www.google.com/patents/CA2457864C?dq=water+based+inks+gravure&ei=VifpU7fGLNG2yATNpYHwCQ&cl=enhttps://www.google.com/search?tbo=p&tbm=pts&hl=en&q=ininventor:%22Aline+Menoud%22https://www.google.com/search?tbo=p&tbm=pts&hl=en&q=ininventor:%22Patrick+Veya%22https://www.google.com/search?tbo=p&tbm=pts&hl=en&q=inassignee:%22Aline+Menoud%22https://www.google.com/search?tbo=p&tbm=pts&hl=en&q=inassignee:%22Sicpa+Holding+Sa%22https://www.google.com/search?tbo=p&tbm=pts&hl=en&q=inassignee:%22Patrick+Veya%22https://www.google.com/patents/WO2003020835A1.bibtex?cl=enhttps://www.google.com/patents/WO2003020835A1.enw?cl=enhttps://www.google.com/patents/WO2003020835A1.ris?cl=enhttps://www.google.com/patents/WO2003020835A1?cl=en&dq=water+based+inks+gravure&hl=en&sa=X&ei=VifpU7fGLNG2yATNpYHwCQ&ved=0CDEQ6AEwAw#backward-citationshttps://www.google.com/patents/WO2003020835A1?cl=en&dq=water+based+inks+gravure&hl=en&sa=X&ei=VifpU7fGLNG2yATNpYHwCQ&ved=0CDEQ6AEwAw#npl-citationshttps://www.google.com/patents/WO2003020835A1?cl=en&dq=water+based+inks+gravure&hl=en&sa=X&ei=VifpU7fGLNG2yATNpYHwCQ&ved=0CDEQ6AEwAw#forward-citationshttps://www.google.com/patents/WO2003020835A1?cl=en&dq=water+based+inks+gravure&hl=en&sa=X&ei=VifpU7fGLNG2yATNpYHwCQ&ved=0CDEQ6AEwAw#classificationshttps://www.google.com/patents/WO2003020835A1?cl=en&dq=water+based+inks+gravure&hl=en&sa=X&ei=VifpU7fGLNG2yATNpYHwCQ&ved=0CDEQ6AEwAw#legal-eventshttps://www.google.com/url?id=7kOuBAABERAJ&q=http://patentscope.wipo.int/search/en/WO2003020835&usg=AFQjCNGcsq__64Mq9VnY7Xjyp45UFvLXQghttps://www.google.com/url?id=7kOuBAABERAJ&q=http://worldwide.espacenet.com/publicationDetails/biblio%3FCC%3DWO%26NR%3D03020835A1%26KC%3DA1%26FT%3DD&usg=AFQjCNGbQsg4x3UeKUUDvl0-nzykxZkohghttps://www.google.com/patents/WO2003020835A1?cl=en&dq=water+based+inks+gravure&hl=en&sa=X&ei=VifpU7fGLNG2yATNpYHwCQ&output=html_texthttps://plus.google.com/u/0/?tab=tXhttps://plus.google.com/u/0/notifications/all?hl=enhttps://plus.google.com/u/0/stream/all?hl=enhttps://plus.google.com/u/0/me?tab=tXhttps://www.google.com/webhp?hl=en&tab=tt

  • group of substituted alkoxy silanes (Ri) y (R20) zSi (wherein Rlf R2 are

    different substituents, y + z = 4) , preferably from the group ofmonosubstituted trialkoxy silanes (y = 1, z = 3) .

    7. Water-based screen printing ink composition according to one of theclaims 1 to 6 characterized in that the said crosslinker is chosen from thegroup of monosubstituted triethoxysilanes, preferably from the groupcomprising epoxy-cycloaliphatic triethoxysilanes and glycidyl- triethoxysilanes.

    8. Water-based screen printing ink composition according to one of theclaims 1 to 7 wherein the catalyst is chosen from the group of imidazoles.

    9. Water-based screen printing ink composition according to one of theclaims 1 to 8 comprising between 30 and 70%, preferably between 35 and60% and more preferably between 40 and 55% w of self-crosslinking acrylicor urethane acrylic copolymer emulsion with respect to the total weight of thecomposition.

    10. Water-based screen printing ink composition according to one of theclaims 1 to 9 comprising between 0.25 and 3%, preferably between 0.5 and2%, and even more preferably between 1 and 2% w of said crosslinker, withrespect to the total weight of the composition.

    11. Water-based screen printing ink composition according to one of theclaims 1 to 10 comprising between 0.05 and 0.6%, preferably 0.1 and 0.4%and even more preferably between 0.2 and 0.4% w of catalyst with respect tothe total weight of the composition.

    12. Water-based screen printing ink composition according to one of theclaims 1 to 11 characterized in that the composition has a pH value between7.0 and 8.5, preferably between 7.5 and 8.3 and even more preferablybetween 7.5 and 8.0.

    13. Water-based screen printing ink composition according to one of theclaims 1 to 12 characterized in that the pigments content is comprisedbetween 10 to 25%, preferably between 12 and 20% and even morepreferably between 15 and 18% of the total weight of the composition.

    14. Water-based s