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Polyurethane resins for inks ( ink binder ) are versatile polymers used in a wide range of applications, including the formulation of inks. Their unique properties make them particularly suitable for various types of inks used in printing processes. Here are some of the primary uses and benefits of polyurethane resins for inks:
Flexibility and Durability: Polyurethane resins for inks impart excellent flexibility and durability to inks, making them ideal for use on substrates that undergo bending, stretching, or other forms of deformation.
Adhesion: One of the key advantages of these laminating adhesives is their ability to adhere well to a wide range of substrates, including plastics, metals, and paper. This makes them suitable for various printing applications where strong adhesion is required to ensure the longevity and quality of the print.
Chemical and Abrasion Resistance: Inks formulated with polyurethane PU resins for ink exhibit excellent resistance to chemicals, solvents, and abrasion.
Gloss and Appearance: Polyurethane resins for inks can enhance the gloss and overall appearance of printed materials.
Flexographic and Gravure Inks: Polyurethane resins for inks from Comens are particularly useful in the formulation of flexographic and gravure inks.
Waterborne and UV-Curable Inks: The push towards more environmentally friendly printing processes has led to the development of waterborne and UV-curable inks containing polyurethane resins.
PU resin is used in ink formulations because of its ability to improve the ink’s performance on various fronts. It enhances the ink’s flexibility, making it suitable for printing on substrates that may bend or stretch. The PU resin for ink （ink binder）also improves adhesion, ensuring that the ink sticks well to different materials, including plastics, metals, and paper. Additionally, PU resin contributes to the ink’s resistance to chemicals, solvents, and physical wear, and can be formulated to provide a desired gloss or matte finish.
The environmental friendliness of PU resins for ink depends on their formulation and the application in which they are used. Waterborne PU resins for ink and those used in UV-curable inks are considered more environmentally friendly options compared to traditional solvent-based systems. They emit lower levels of volatile organic compounds (VOCs), reducing their impact on air quality. However, the production and disposal of PU polyurethane resins for inks still pose environmental challenges that are being addressed through ongoing research and development.
PU resins for ink offer several advantages over other types of resins used in inks, such as acrylics, vinyl, and alkyds. They generally provide superior flexibility, adhesion, and resistance to chemicals and abrasion. PU resins for ink can also be formulated to achieve a wide range of finishes, from high gloss to matte. However, the choice of polyurethane resin for inks depends on the specific requirements of the printing application, including the substrate, printing process, desired properties of the final print, and environmental considerations.
Yes, PU resin inks can be used in digital printing, particularly in applications where durability, flexibility, and adhesion are important. They are suitable for printing on a variety of substrates, including flexible films and rigid materials. The use of PU resins for digital ink formulations allows for high-quality prints that can withstand handling, exposure to elements, and mechanical stress.
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