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a technology of ink-receptive coating and water-based ink, which is applied in the field of coatings, can solve the problems of no coating, and achieve the effects of increasing the receptivity of the film, preventing agglomeration, and increasing the receptivity of the coating
Inactive Publication Date: 2005-01-27
3M INNOVATIVE PROPERTIES CO
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Problems solved by technology
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Benefits of technology
The present invention provides a film that is receptive to a variety of different classes or kinds of inks, such as water based inks, solvent based inks and UV cured inks such as UV-Flexographic inks. The film is applied to at least one side of a substrate, such as, for example, a polymeric film, to permit printing on the substrate to adhere when one or more kinds of ink are used.
The film of this invention is formed from a water dispersible polymer dispersed in water in an amount sufficient to form a film. The water dispersible polymer needs to be stable as a water dispersion without substantial agglomeration prior to forming said film. The film further has a polar component sufficient to increase the receptivity of said film to printing with water-based ink.
The preferred film of this invention includes (1) a water based latex polymer, such as transparent film-forming core / shell latex polymers, or an aqueous polymer dispersion, such as a water based dispersion of a sulfonated polyester or a polyurethane, and (2) a polar polymer, such as polymers having an ionic or ionizable component, to increase the receptivity of the coating to water-based inks. In some cases, a surfactant, such as an alkylaryl sulfonate may be needed to prevent agglomeration of the latex polymer before it is formed into the film, and in other cases the surfactant used in the manufacture of the latex is sufficient to prevent agglomeration.
It is intended that the film of the present invention be applied to a substrate, such as, for example, a polyethylene terephthalate film filled with BaSO4 for use in label stock materials. The film is to be coated on at least one major surface of the substrate, but may also be applied to substrates that have a gloss side and a matte side, since the location of the printing is not a limitation in this invention. Water based inks, solvent based inks and UV cured inks all work well with the ink receptive coating of this invention.
Problems solved by technology
However, at the present time there is no coating that is receptive to all three classes of inks to provide a single process for making a universally-printable coated substrate.
Method used
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Examples
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example i
A latex formulation was prepared according to the following Table I for use as ink receptive coating A.
a= an ethyl acrylate - isobornyl acrylate core with a methyl methacrylate - isobornyl acrylate - ethyl acrylate shell
b= sodium dodecylbenzenesulfonate (Rhodia)
#2 = poly(sodium 4-styrene sulfonate) (Aldrich)
d= a mixture containing ethoxylated acetylenic diols
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Abstract
A film receptive to a variety of different classes or kinds of inks, such as water based inks, solvent based inks and UV cured inks is disclosed. The film includes a water dispersible polymer having a polar component or a water dispersible polymer and a polar polymer, such as a polymer having an ionic component to increase the receptivity of the coating to water-based inks. A surfactant, such as an alkyaryl sulfonate, to prevent agglomeration of the polymer before it is formed into film may also be included. The preferred water-dispersible polymer is a core/shell latex polymer. The preferred polar polymer is chemically compatible with latex polymers and is sufficiently ionic or polar to improve the printability onto the film of water-based inks. The surfactant, which may be in the latex as manufactured or may be added separately, and preferably has a molecular structure that includes at least one hydrophobic moiety and at least one anionic group such as sulfates, sulfonates and the like.
Description
FIELD OF THE INVENTION The present invention relates to coatings that are receptive to ink printing. More particularly the invention relates to water-based ink-receptive coatings that accept water based inks, solvent based inks and UV-cured inks. BACKGROUND OF THE INVENTION There are a number of ink receptive coatings available today for various printing techniques. These include coatings which are selectively receptive to water based, solvent based and / or UV cured inks. However, at the present time there is no coating that is receptive to all three classes of inks to provide a single process for making a universally-printable coated substrate. For example, labels and other materials are designed to be printed on one side and have a pressure sensitive adhesive on the other side. When the label stock is processed into a final product, one form of ink may be used to apply the company logo and / or address, instructions and other indicia. Another form of ink may be used to apply speci...
Claims
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Application Information
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Patent Type & Authority Applications(United States)
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