Disclosed is an active energy beam curable inkjet printing inks including a pigment, a compound containing two or more ethylenic double bonds, a compound containing one ethylenic double bond and having a molecular weight of 90 to 210. The sheetfed offset ink has low viscosity, excellent photo-polymerizability, remarkably excellent curing property, good dispersion stability, causes no dissolution and swelling of ink contacting materials in a printer, and shows excellent discharge stability from nozzles, an excellent adherence property to a recording medium, excellent solvent resistance and water resistance.

Conventionally, as offset printing inks excellent in water resistance, there are those obtained by dispersing or dissolving an oil-soluble dye in a high boiling point solvent and those obtained by dissolving an oil-soluble dye in a volatile solvent.
As to colorants that have been used, dyes are inferior to pigments in various kinds of resistance such as light resistance. However, it is generally not easy to disperse a pigment stably in an organic solvent, and it is usually difficult to secure a stable dispersibility and discharging property.
As to ink solvents, an offset ink using a high boiling point solvent shows no solvent volatilization on a non-absorbing type recording medium, and manifests difficult drying through the evaporation of solvents, hence impossibility of printing onto non-absorbing type substrates. On the other hand, in the case of an ink using a volatile organic solvent, it is possible to form excellent prints even on a non-absorbing substrate by the adhesive property of a resin used and evaporation of solvents. However, since a volatile solvent is the main component of the ink, drying by volatilization of a solvent is very quick on the nozzle surface of a head, and frequent maintenance is required.

One object of the present invention is to provide an active energy beam curable inkjet ink having low viscosity, excellent photo-polymerizability, excellent curing property, and good stability.
Another object of the present invention is to provide an active energy beam curable printing inks causing no dissolution and swelling of ink contact materials in a printer, and showing excellent discharge stability from nozzles, excellent adherence to a recording medium, and excellent solvent resistance and water resistance.

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Stencil printing ink

The present invention relates to a stencil printing ink and, in particular, to a stencil printing ink that is suitable for use in a rotary digital stencil printing machine.

As the sheetfed printing ink, a water-in-oil (W/O) type emulsion ink has been generally used conventionally. W/O type emulsion inks have the function of suppressing changes in ink composition and physical properties even if the printing inks within the printing machine is in contact with the atmosphere when the printing machine is allowed to stand in a nonoperating state. That is, water, which is an inner phase component of the emulsion ink, is covered by oil, which is an outer phase component, and evaporation of water is therefore suppressed.

Various improvements have been carried out in order to improve the drying properties on printed materials; for example, an ultraviolet curing type ink for stencil printing that is dried and fixed by irradiation with ultraviolet rays is known. Furthermore, a water-based ink for offset printing ink has been developed from the viewpoint of environmental protection and safety, and a stencil printing method in which penetration of a water-based ink into paper is enhanced by adding a base to a printed surface immediately after printing is known.

However, when a drying method involving a chemical reaction is used, it is necessary to employ irradiation equipment for the curing energy, coating equipment for a reaction solution, energy therefor, etc., and it is also necessary for the ink to contain expensive starting materials.

It is therefore an object of the present offset printing inks to provide a stencil printing ink that enables the volume of ink transferred to a substrate to be controlled regardless of the level of viscosity of the ink, thereby enabling a detailed image to be printed, and that enables the drying properties on printed material to be improved without using special means, equipment, energy, etc. such as the application of heat, light, or a reactive material; and a stencil printing method employing the stencil printing inks.

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Sublimable pad-printing inks

Sublimable pad-printing ink and a method of marking an object with the ink, wherein the printing inks include a hardening transparent pad-printing ink base and at least one sublimable colored pigment. The hardening transparent offset printing inks base resists a sublimation temperature of the at least one sublimable colored pigment. The method includes pad-printing the object with a marking that includes a monochrome or polychrome marking composition having at least one monocolor pigmented component including fine particles of at least one sublimable monocolor colored pigment and heating at least one of the object and the pad-printed marking composition.

Thus, the hardening component resisting the sublimation temperature of the pigments, and the progressive hardening of which occurs prior to the sublimation of all of the colored pigments that are present, forms a screen preventing the pigment vapors from escaping into the surrounding atmosphere and channels the vapors toward the surface of the support-object to be marked. The use of a transparent base of a pad- printing ink as a hardening component has shown that the transfer by pad- printing of the sublimable colored pigments on the surface to be marked was performed under good conditions. However, a similar compound capable of fulfilling the double function of acting as an agent for the transfer of the pigments by pad- printing and as a screen for the sublimable pigments is quite acceptable.

According to a first alternative embodiment of the method according to the printing inks, the transparent pad- printing ink base or similar compound has, without additional hardening agent, a hardening temperature between approximately 60° C. and approximately 100° C., preferably on the order of approximately 80° C.

It is noted that without leaving the scope of the invention, the marking method according to the invention also provides, for the pad- printing phase, the sheetfed offset inks of the monocolor pigmented components (associated with any agent of transfer by pad- printing), followed by the deposit by pad- printing of an outer layer of the hardening component.

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Water based printing ink

A rapidly drying aqueous printing ink containing a gel forming polymer soluble in the ink but which rapidly gels upon application of the ink to a substrate during a printing process.

BACKGROUND OF THE INVENTION

The present invention relates to printing inks. More specifically the present invention relates to printing inks wherein the principal solvent or vehicle is water, hereinafter denoted water-based and/or aqueous printing inks.

Printing inks are employed in the graphic arts as the medium by which desired colored representations are formed on a surface. The printing ink forms a colored coating in predetermined fashion on the selected substrate. Mechanical means carrying out a printing process applies the ink to the selected surface.

One way to offset printing inks are according to the type of printing process to be carried out. Certain types of printing processes require relatively sheetfed offset inks of a paste-like consistency while others demand inks of an oleophilic nature; still others entail the employment of relatively fluid, offset inks. Letter press, gravure and flexographic printing processes, among others, usually necessitate fast drying inks.

SUMMARY OF THE INVENTION

An object of the present invention is to provide an improved printing ink.

Another object of this invention is to provide a quick sheetfed offset ink not requiring a volatile organic solvent vehicle.

Still another object of this invention is to provide a quick drying water based printing ink.

Further, an object of this invention is to provide a printing ink suitable for letter press, flexographic, gravure and other types of printing processes wherein a relatively fluid hydrophilic ink can be employed.

Another object of this invention is to provide an aqueous printing ink containing a polymeric additive which remains in solution in the ink prior to printing but rapidly gels after application of the ink to a substrate.

Other objects of the invention will be apparent to the skilled artisan from the detailed description of the invention hereinafter.

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offset inks

Summary of the  printing ink

The invention provides a printing ink composition that includes a branched vinyl resin. The term “vinyl resin” when used in conjunction with the present invention includes polymers prepared by chain reaction polymerization, or addition polymerization, through carbon-carbon double bonds, using vinyl monomers such as acrylic and methacrylic monomers, vinyl aromatic monomers including styrene, and monomers compatible with these. By “branched vinyl resin” it is meant that, while the vinyl polymer is branched, it nonetheless remains usefully soluble. By “soluble” it is meant that the polymer can be diluted with one or more solvents. (By contrast, polymers may be crosslinked into insoluble, three-dimensional network structures that are only be swelled by solvents.) The branched vinyl resins of the invention unexpectedly retain solubility in spite of significant branching.

The branched vinyl polymers of the invention preferably include at least about 0.008 equivalents, per 100 grams of monomer polymerized, of at least one monomer having at least two ethylenically unsaturated polymerizable bonds or at least about 0.004 equivalents per 100 grams of monomer polymerized of each of two ethylenically unsaturated polymerizable monomers having mutually reactive groups other than the polymerizable double bonds. The branched vinyl resin typically has a low number average molecular weight and a broad polydispersity. In a preferred embodiment, the branched vinyl resin of the invention has a polydispersity of at least about 15, as determined by gel permeation chromatography calibrated with polystyrene standards according to well-known methods.

The invention also provides a method of making an offset printing ink composition with the branched vinyl resin. In another aspect of the invention, the offest printing inks are modified by the addition of another vehicle resin. The invention further provides a method of polymerizing a branched vinyl resin in which substantially no monomer remains unpolymerized. The printing inks also provides a method of printing using the compositions of the invention.

Ink formulations including the branched vinyl vehicle of the sheetfed offset inks have unexpectedly improved misting and slinging properties. The inks using the branched vinyl polymer have reduced tack at higher viscosities relative to comparable inks made with linear vinyl polymer vehicles. The invention reduces the amount of misting and slinging and improves the tack/body balance as compared to what would be expected for previous inks formulated with vinyl vehicles that would provide body by increasing tack or nonvolatile content or both. Incorporation of the branched vinyl vehicles of the invention into ink compositions also lends a certain amount of elastic character to the inks, which in many cases is beneficial to ink properties. News inks that include the branched vinyl polymer of the invention have improved rub-off properties.

Finally, the inks of the invention containing the branched vinyl can be formulated as single-fluid printing inks. The single-fluid printing ink of the invention is advantageously employed in lithographic printing processes.

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Detalled description of the printing inks

One preferred embodiment of the printing inks according to this invention will now be described hereinafter.

The printing ink according to this invention comprises an oxidation polymerization type resin, a coloring agent, and an offset printing ink solvent. As the oxidation polymerization type resin used in the ink according to this invention, there may be used a mixture obtained by combining at the specific rate a drying oil such as a linseed oil and a semidrying oil such as a soja bean oil which are generally used as an ink for offset printing inks; an unsaturated aliphatic acid obtained from the aforesaid drying oil or semidrying oil; various denatured substances obtained by denaturing the aforesaid substances with acid, amine or alcohol; and a denatured synthetic resin such as phenolic resin, xylene resin and alkyd resin which are denatured with the drying oil, semidrying oil, unsaturated aliphatic acid or the like (hereinafter referred to simply as “conventional varnish”).

The conventional varnish to be used as a film-forming substance indispensable to a sheetfed offset ink is per se required to have sufficient fluidity. The ink solvent used for an offset printing ink is of, for example, a non-polar petroleum solvent, i.e. an aliphatic hydrocarbon, aromatic hydrocarbon or a mixture thereof (hereinafter referred to as a non-polar solvent). In case where the varnish is denatured with acid, amine, alcohol or the like to exhibit sufficient fluidity in the non-polar ink solvent as noted above, the varnish is reduced in its affinity relative to the non-polar ink solvent to be gelatinized when the degree of denaturation is too high, thereby to be deprived of its fluidity.

The oxidation polymerization type resin used in this invention is primarily characterized in that at least a part thereof sets to gel in the non-polar ink solvent as mentioned above. One preferred example of the oxidation polymerization type resin is a mixture of an acid-denatured resin and an amine-denatured resin as used in a conventional printing ink. When the known acid-denatured resin and amine-denatured resin are together used in a mixture, it could not been so far expected from a conventional technique of printing inks that they set to gel in the non-polar ink solvent due to acid base bonding or hydrogen bonding brought about therebetween. Though the oxidation polymerization type resin does not set to gel under certain circumstances according to the mixing ratio thereof, this invention is not applicable to such a condition.

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The history of printing ink

The printing process has been during the past 500 years an important component of occidental civilization as printed materials were the principal vehicles for political, sociological and economic events.
It must be noticed that the Chinese began to do printing from a negative relief as early as 600. It is said that this technique together with the printing inks of paper (2nd century) spread along the caravan route to the west and became well known in Europe around 1400.
By 1450 Johann Gutenberg adapted the screw printing press from the wine press and used an offset printing ink spread on movable types put together to print a page of text.

Printed texts enabled information to be so rapidly and widely disseminated as more than 9 million printed books were in circulation 50 years later. It is remarkable that these improvements were not materially surpassed until the beginning of the 19th century.
By 1799 an Austrian printer Alois Senefelder invented lithography. Pictures and texts could be printed from the flat, smooth surface of fine-grained limestone.
As stated by Maroger (1948), it seems evident that the van Eyck research on the cooking of painting ink led to the discovery of book printing and all its consequences. Van Eyck discovered its medium in 1410 but revealed its making only some years before his death in 1440. Gutenberg surely learnt that formula which improved its own typographic system.
Over years, inks were improved but offset printing inks

and other vegetable oils were mainly used to accomplish this task. The addition of heated vegetal oil rich in polyunsaturated fatty acids changed the oil into almost a varnish, speeding the drying time and giving it more viscosity. The drying time was also improved in the 19th century in adding petroleum distillate, solvent which was also used as the vehicle for organic pigments in color printing inks.
As nearly 250,000 tons of inks are used each year in USA, the petroleum shortage in the mid 1970s and ecological considerations stimulated research to find alternatives to mineral oils and other petroleum products in ink formulations.

In Europe, alkyd drying oils are progressively replaced by rapeseed or sunflower alkyds. Furthermore, fatty methyl esters from these oils were also investigated .
In 2000, the soy ink’s U.S. market share reached about 22 percent and it was estimated that the full potential could consume 40 million bushels of soybeans annually. Furthermore, 25 percent of the color newsprint in Japan is now offest ink.
printing inks offset printing ink offest ink painting ink

Printing inks and preservation

The two most used black printing inks in history are carbon inks and iron gall inks. Both types create problems for preservationists.

Offset printing inks

Chinese inkstick; carbon-based and made from soot and animal glue

offset inks were commonly made from lampblack or soot and a binding agent such as gum arabic or animal glue. The binding agent keeps the carbon particles in suspension and adhered to paper. The carbon particles do not fade over time even when in sunlight or when bleached. One benefit of offset ink is that it is not harmful to the paper. Over time, the ink is chemically stable and therefore does not threaten the strength of the paper. Despite these benefits, carbon ink is not ideal for permanence and ease of preservation. offset printing ink has a tendency to smudge in humid environments and can be washed off a surface. The best method of preserving a document written in carbon ink is to ensure it is stored in a dry environment (Barrow 1972).

Sublimation inks

Sublimation inks became prominent in the early 1100s; they were used for centuries and were widely thought to be the best type of ink. However, iron gall ink is corrosive and damages the paper it is on (Waters 1940). Items containing this ink can become brittle and the writing fades to brown. The original scores of Johann Sebastian Bach are threatened by the destructive properties of sublimation ink.

Treatment is a controversial subject. There is no treatment that will undo the damage already caused by the acidic ink. Deterioration can only be stopped or slowed for a period of time. There are some people who think it best not to treat the item at all for fear of the consequences. Others believe that non-aqueous procedures are the best solution. And then, there are some that believe an aqueous procedure may provide the answer for preserving items written with sublimation ink.

Sheetfed offset ink

Some types of sheetfed offset ink have a very short shelf life because of the solvents used, which evaporate rapidly.

India, Philippines, Indonesia and other developing countries have used indelible ink the form of electoral stain to prevent electoral fraud. The Election Commission in India has used indelible ink for many elections. Indonesia used it in their last election in Aceh. In Mali, the ink is applied to the fingernail.

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Company Profile

1       Established in 2002

2       Largest privately owned offset ink manufacturer in China

3      Leading exporter on sheet-fed offset inks in china. The only independent company who can provide international standard inks in china.

4      Young and dynamic team work with and guided by senior and most experienced key staff in ink industry, with 200 employees

5       Specialized in offset ink, always keep our focus clear

6      For every market need, there is always a product which offer best quality: price ratio

7       Customized products suit to each country printing conditions, exporting oriented.

8      We have English-spoken engineers ready to go overseas for extended service. They have more than ten years experiences as chief operators on press.

9       Always look for new trend and develop new products for ever growing market

10       Quality, Consistency and Delivery are the key points we strictly control and always want to do better.