Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Utility Patent
1998-05-01
2001-01-02
Cain, Edward J. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S492000, C524S493000
Utility Patent
active
06169129
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to ink and coating compositions containing silicon-treated carbon black.
2. Discussion of the Related Art
Inks are colored liquids or pastes formulated to transfer an image. Pigments such as carbon black are used to impart desired properties to an ink system. Desired properties of inks include visual characteristics such as jetness, opacity, and blue tone. Other performance characteristics include appropriate Theological properties, waterfastness and permanence. For economic reasons, it is desirable to have a pigment that readily disperses in the ink formulation. The measure of the rate of dispersion is the premix residue. Properties such as premix residue thus have a significant influence on the economics of ink production.
Coatings are used for decorative, protective and functional treatments of many kinds of surfaces. Pigments are also commonly used in coatings to impart desired properties. Desired properties similarly may include jetness, opacity, and blue tone, as well as appropriate Theological properties. As in inks, for economic reasons, it is desirable to have a pigment that readily disperses in the coating formulation. Some coatings, such as those on undersea pipelines, are for protective purposes. Others, such as exterior automobile coatings, fulfill both decorative and protective functions. Still others provide friction control on boat decks or car seats.
There remains a need for improved ink and coating compositions available for use in a variety of applications.
SUMMARY OF THE INVENTION
The present invention relates to ink and coating compositions comprising a silicon-treated carbon black. The silicon-treated carbon black may have at least one attached organic group. The present invention also relates to ink and coating compositions comprising a combination of silicon-treated carbon black products, with and/or without at least one attached organic group, and untreated carbon black. The present invention further relates to methods for: improving the jetness, improving the blue tone, improving the platewear, reducing the premix residue, modifying rheological properties, or improving waterfastness, of ink and coating compositions by incorporating therein silicon-treated carbon black.
Both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to ink and coating compositions comprising silicon-treated carbon black.
The ink and coating compositions of the present invention may comprise a silicon-treated carbon black. The silicon-treated carbon black may have no attached organic group or may have at least one attached organic group; or it may comprise both silicon-treated carbon black having at least one attached organic group and silicon-treated carbon black having no attached organic group. Untreated carbon black may be combined with either type of silicon-treated carbon black, or with a mixture of both types of silicon-treated carbon black. “Untreated carbon black” is carbon black that has not been treated with silicon. “Untreated carbon black” may be completely untreated, may have one or more attached organic groups, or may have been otherwise treated.
The ink and coating compositions of the invention advantageously provide an improvement in one or more of jetness, blue tone, platewear, premix residue, rheological properties, and waterfastness
The silicon-treated carbon black of the ink or coating of the present invention typically contains from about 0.1 to about 25 weight % silicon, based on the weight of the silicon-treated carbon black. Preferably, the silicon-treated carbon black contains from about 0.2 weight % to about 10 weight % silicon, and more preferably about 0.2 to about 5.4 weight %, based on the weight of the silicon-treated carbon black.
Typically, the silicon-treated carbon black may be present in the ink or coating in amounts up to about 60% by weight, based on the weight of the ink or coating. Preferably the silicon-treated carbon black is present between about 10 and about 25% by weight for finished inks and between about 2 and about 25% by weight for coatings. In both inks and coatings, it is not unusual to disperse the carbon black at a higher loading and then reduce it to the final desired loading after the dispersion step.
The ink and coating compositions of the present invention may be aqueous or non-aqueous, and the ink compositions may be used in ink jet applications. Aqueous includes mixtures of water and other water-miscible or -dispersible substances, such as alcohol. The ink and coating compositions of the present invention may exhibit unique rheological properties, depending on whether the compositions are aqueous or nonaqueous and on the particular base used in the composition.
The ink compositions of the invention may further optionally include resins/polymers, additives, fillers and/or diluents.
When used, ink composition ingredients such as those listed above are weighed, and mixed and ground together or separately, according to desired formulas.
The ink compositions of the invention are useful in, by way of example, printing inks, ultraviolet cure inks, ball point inks, stamp pad inks, and inks for other applications. McGraw-Hill's Encyclopedia of Science and Technology, 6th Edition, Vol. 9, pages 171-176, provides further details of the types of inks available and their uses, all of which is incorporated herein by reference.
For a general discussion on the properties, preparation and uses of aqueous inks, see, The Printing Manual, 5th Ed., Leach et al., Eds. Chapman and Hall, 1993, incorporated herein by reference. Various aqueous ink compositions are also disclosed, for example, in U.S. Pat. Nos. 2,833,736, 3,607,813, 4,104,833, 4,308,061, 4,770,706 and 5,026,755, the disclosures of which are incorporated herein by reference.
Non-aqueous inks are used for many applications where aqueous vehicles are not suitable. For instance, inks which are to be printed on hydrophobic, non-porous substrates such as glass, metal or plastics must be fast drying. Therefore, solvents such as ketones, esters, alcohols or hydrocarbons are often used instead of water. Such solvent based inks are used widely for industrial labeling of cardboard boxes and various metal or plastic containers and components.
One common type of nonaqueous ink is newsink. A typical newsink can be made in two stages. First, a pigment, e.g., the silicon-treated carbon black of the present invention, and a vehicle are mixed to form a ‘premix’, and the premix is then milled to achieve optimum dispersion of the pigment. Generally, lower premix residues result in faster or improved dispersion, which results in improved economy for the producer.
Flow properties of ink at low shear rates are affected by the dispersion characteristics of the ink's pigments. Depending on the application, different levels of flow are desirable. In screen printing inks, it is desirable to have inks with short flow so that the inks do not flow through the screen prematurely. In offset printing, longer flows may be desirable as the ink travels over the inking rollers. Rheological additives are often added to adjust such flows.
Ink jet printing is a non-impact process wherein droplets of ink are produced and deposited on a substrate such as paper, transparent film, or textile material in response to an electrical signal. Conventional inks for ink jet printers comprise a colorant such as a dye which is soluble in the ink vehicle. Dyes have several disadvantages when used in ink jets, however. Dyes may redissolve in water, dye images smear or rub off on contact with felt pen markers, and dyes exhibit poor light stability. Pigments used as colorants in ink jet inks offer superior properties in such areas as waterfastness, lightfastness, image density and thermal stability. The silicon-treated carbon black pigment must be dispersed and stabiliz
Adams Curtis E.
Belmont James A.
Foster John K.
Mahmud Khaled
Cabot Corporation
Cain Edward J.
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