Coating ingredients for Varnishes / Over Print Varnish (OPV)

EBECRYL® 436 by allnex is a reactive chlorinated polyester resin diluted 40% with the reactive diluent trimethylolpropane triacrylate (TMPTA). It exhibits good lithographic behavior, pigment wetting properties and fast cure response in ultraviolet light (UV) curable coatings and inks. Cured films of EBECRYL® 436 display good adhesion to metals, plastics and paper. It is recommended for wet lithographic inks for paper, plastics and metals, overprint varnishes and post-formable inks.

THIXATROL® ST by Elementis acts as a rheological additive for use in aliphatic and aromatic solvent-based coatings. It is an organically modified castor oil derivative. It provides increased viscosity, thixotropy, pigment suspension and sag control. It improves the flow and leveling of powder coatings. It is suitable for chlorinated rubber- and decorative coatings, traffic- and anti-fouling paints.

• It offers controlled penetration into porous substrates and imparts excellent package stability and reproducibility.
• It shows no adverse effect on paint durability and no influence on water-resistance of organic systems.
• It is non-yellowing in the final formulation and does not normally react with system components.
• THIXATROL® ST is used in epoxies, polyurethanes, varnishes, air dry industrial-, high build- and hammer finishes.
• The recommended dosage level is 0.2-0.8% by weight.
• It has a shelf life of 4 years.

EBECRYL® 600 by allnex is a low VOC diacrylate ester of bisphenol A epoxy resin. It provides light color and fast cure response.

• Films cured via exposure to ultraviolet light (UV) or electron beam (EB) possesses high surface hardness and gloss and excellent chemical resistance.
• It reduces energy consumption and exhibits low carbon foot print, good compatibility, low flammability and long potlife.
• It is a radiation curable, solvent- and tin free grade.
• EBECRYL® 600 is recommended for lithographic and screen inks, overprint varnishes and fast cure coatings.
• It is also used in coatings for paper, paperboard, wood, chipboard and rigid plastics.

CASAMID® 878 by Thomas Swan is an alcohol-soluble polyamide resin. It provides superior anti-blocking properties, preventing layers from sticking together.

• It has a high melting point (140-150°C), offering exceptional thermal stability for demanding applications.
• It features a low odor formulation, ideal for sensitive packaging and coating uses.
• It ensures excellent film formation upon solvent extraction for high-quality, durable prints and coatings.
• It prevents premature gelation, though higher alcohols or hydrocarbon solvents may be needed for added stability.
• The amide groups interact with pigments and substrates, ensuring optimum dispersion, gloss, and rub resistance.
• It enhances durability in printing and coating applications.
• CASAMID® 878 delivers superior adhesion and print quality in specialized flexographic ink applications.
• It offers excellent release properties and durability in release lacquers.
• It is optimized for overprint varnishes, providing smooth coverage.
• It provides strength and barrier performance in coatings.
• It ensures long-lasting resistance to heat, abrasion, and environmental factors in high-performance packaging inks.
• It has a shelf life of 12 months.

WANNATE® BIO PDI by Wanhua Chemical is an aliphatic pentamethylene diisocyanate. It is a low viscosity and less irritant liquid at room temperature. It is raw material of bio-based polyurethanes. It offers lightfastness, powdering resistance, good color retention, and weathering resistance.

• It exhibits high degree of oil resistance coupled with good wear-resisting.
• It is used in PU varnish, top-grade coatings, car refinishing paint, plastic coating, top-grade wood paint, industrial coating and anti-corrosive coating.
• It is suitable for coating curing agent and collar copolymer coating.
• WANNATE® BIO PDI has a shelf life of at least 9 months when stored at temperatures between 0 and 30°C.

CASAMID® 833 by Thomas Swan is a co-solvent polyamide resin. It acts as a film-forming binder that enhances adhesion, print quality, and flexibility of ink systems.

• It provides excellent adhesion to treated polyolefin substrates with good re-solubility in press.
• It offers superior compatibility with phenolic resins, nitrocellulose, alcohol, hydrocarbons, and esters.
• It is used in laminating inks to enable strong bond development with minimal solvent retention when properly formulated.
• It is also used in flexible packaging for food and consumer goods, offering excellent adhesion on films such as BOPP and treated polyethylene, along with good print definition.
• CASAMID® 833 enables excellent pigment dispersion and re-solubility properties in flexographic and gravure applications.
• It offers anti-blocking and gelation resistance in formulations.
• It is used in cold-seal release lacquers, providing high alcohol tolerance for reliable release performance and excellent stability on high-speed presses.
• It is optimized for overprint varnishes, providing smooth coverage, enhanced abrasion resistance and improved gloss.
• It has a shelf life of 12 months.

EBECRYL® 578 by allnex is an inert resin diluted in trimethylolpropane ethoxylate triacrylate (TMPEOTA). It possesses medium viscosity, and is VOC-, chloride- and solvent-free. It is developed for ultraviolet light (UV) or electron beam (EB) cured offset lithographic inks and coating.

• It provides good adhesion to various substrate such as metallic and plastic materials.
• It exhibits good pigment wetting and high reactivity and cure speed, and low color for clearcoat.
• EBECRYL® 578 is used in other applications such as screen, gravure, flexo and overprint varnish.
• It has a shelf life of 2 years.

CASAMID® 874 by Thomas Swan is a general purpose, alcohol-soluble polyamide resin. It forms a cohesive, durable film upon solvent evaporation. It offers high blocking resistance and water resistance, making it ideal for packaging requiring moisture protection.

• It provides enhanced gelation resistance, ensuring stable formulations and preventing premature thickening.
• It has excellent solvent compatibility, allowing flexible ink formulations while maintaining strong adhesion.
• It requires less nitrocellulose than conventional resins, simplifying formulations and reducing costs.
• It is broadly compatible with alcohol-based solvents and ink additives, enabling easy formulation adjustments.
• CASAMID® 874 improves pigment dispersion for vibrant and consistent color development.
• The amide groups interact with the substrate and pigments, enhancing gloss and abrasion resistance, making them ideal for flexible packaging and printing applications.
• It delivers excellent print quality, superior adhesion, and strong resistance in flexographic inks and lacquers.
• It is used in laminating inks for multi-layer packaging applications due to its high bond strength and flexibility.
• It is optimized for overprint varnishes, providing smooth coverage.
• It ensures reliable performance in both industrial and packaging coating applications.
• It has a shelf life of 12 months.

CASAMID® 831 by Thomas Swan is a thermoplastic, non-reactive co-solvent polyamide resin. It offers good lay, while exhibiting limited gelation resistance and low tolerance to polar solvents.

• It delivers the highest performance in alcohol-hydrocarbon systems and also stabilizes pigment dispersion.
• It is used in flexible packaging applications such as gravure inks on OPP, PE, and PET films, providing fast drying, high adhesion, and strong color holdout.
• It offers excellent flow, anti-blocking resistance, exceptional ink transfer, strong film integrity, wetting, and solvent release for inks such as flexographic inks.
• CASAMID® 831 is used in publication and graphics applications, including inks for catalogues, labels, and decorative film prints, ensuring smooth laydown and sharp definition.
• It is also used in industrial coatings, including polyamide-modified nitrocellulose lacquers or phenolic blends, to enhance hardness and flexibility.
• It is used in overprint varnishes as topcoats for printed films, providing mechanical protection along with high gloss, and clarity in clear lacquer systems.
• It is compliant with FDA 175.320 guidelines.
• It has a shelf life of 12 months.

CASAMID® 843W by Thomas Swan is an alcohol-reducible thermoplastic polyamide resin modified with wax. It combines the features of both alcohol-soluble and alcohol-reducible polyamides.

• It provides broad solvent compatibility.
• It has low static and dynamic coefficients of friction.
• Its excellent gelation resistance offers high-speed printing and improved ink transfer.
• CASAMID® 843W has very low odor, suitable for indirect food contact and hygiene-sensitive sectors.
• It has a thermoplastic nature that aids in fast drying and re-solubility during multi-pass printing.
• It improves print clarity and scuff resistance in flexographic and gravure surface inks, especially on polyethylene and BOPP.
• It enhances slip, anti-blocking, and rub resistance in overprint varnishes and lacquers used for flexible packaging.
• It ensures odor neutrality and a smooth finish in personal care packaging for sensitive applications.
• It provides reliable release properties in cold-seal and release lacquers without additional modifiers.
• It is optimal for achieving smooth coating flow and excellent film formation in specialty coatings for films.
• For enhanced surface properties, it can be blended with 5–10% standard polyamides or nitrocellulose systems.
• It is recommended to use 15–30% resin solids in the total formulation for inks and overprint varnishes.
• It has a shelf life of 12 months.