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Resin technology

Polyurethane Binders for Printing Inks

Solvent-based PU binder systems for gravure and flexographic inks

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Key facts

  • High-performance polyurethane binder systems for solvent-based printing inks.
  • Developed for gravure and flexographic printing on packaging films.
  • Key properties: adhesion to treated films, flexibility, printability, chemical and abrasion resistance.
  • Viscosity and solids content are optimised for the customer's press and drying conditions.

Polyurethane binders are the workhorse of solvent-based packaging inks, and for good reason. The urethane backbone gives a film that is simultaneously tough and flexible — the combination that lets a printed film survive slitting, pouch forming, lamination and handling without the ink cracking or lifting.

CoatPro Innovations develops polyurethane binder systems for solvent-based printing ink applications. Solutions can be developed for gravure and flexographic printing and for different film and substrate requirements. In practice that means the binder is built around your specific combination: the film and its treatment level, the press type and speed, the drying capacity available, the solvent blend you run, and what happens to the print downstream.

The properties that matter most in this category — adhesion to packaging films, flexibility and toughness, printability and appearance, chemical and abrasion resistance — pull against each other. A binder optimised purely for adhesion tends to be soft and blocks in the reel. One optimised for block resistance tends to be hard and fails on flex. Getting the balance right for a particular job is the development work, and it is what we do with customers rather than for them.

We can also adjust the practical formulation parameters: solids content, viscosity at supply, dilution behaviour in your solvent system, and compatibility with your existing pigment concentrates and additives.

What this technology delivers

  • Adhesion to packaging films

    Formulated for treated BOPP, PET, PE, CPP and metallised film surfaces.

  • Flexibility and toughness

    Film integrity through slitting, creasing, pouch forming and handling.

  • Printability and appearance

    Controlled transfer and lay-down on gravure and flexo presses.

  • Chemical and abrasion resistance

    Resistance to the solvents, handling and rub encountered in service.

  • Application-specific optimisation

    Viscosity and solids adjusted to your press, drying and solvent system.

Technical data

Typical properties

Verified values are supplied with the technical data sheet for the specific grade, once it has been matched to your application.

Regulatory and compliance information is provided per product and per market on request, supported by the relevant documentation.

Typical properties — Polyurethane Binders for Printing Inks
Appearance Visual Available on request
Solids content ASTM D1259 Available on request
Viscosity at 25 °C Brookfield Available on request
Solvent system Available on request
Density at 25 °C ASTM D1475 Available on request
Recommended dosage Available on request
Storage stability Ambient, sealed container Available on request

Typical values are supplied with the technical data sheet for the specific grade, once the grade is matched to your application. Request the data sheet.

Common questions

About Polyurethane Binders for Printing Inks

Not covered here? Send us the substrate, process and performance target — our technical team answers specifics directly.

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They are developed for solvent-based gravure and flexographic printing. Within each process, the binder is adjusted for the press type, line speed and drying capacity you run, so a gravure grade for a high-speed packaging press and one for a slower specialty line are not the same product.

The binder systems are developed for the film-based substrates used in flexible packaging — treated BOPP, PET, PE, CPP, metallised films and paper-film laminates. Adhesion depends heavily on the surface treatment level of your specific film, so we ask for the film and its dyne level before recommending a grade.

Yes. If you can share the performance you need and the constraints you work within — solvent system, press, substrate, downstream process — we can work toward a binder that fits your existing formulation rather than requiring you to rebuild it.

Polyester-based polyurethanes generally offer higher film strength, better solvent resistance and better adhesion to polar substrates. Polyether-based polyurethanes generally offer better hydrolytic stability and low-temperature flexibility. The right choice depends on the service conditions, which is part of the development discussion.

Yes. Our development process is built around customer trials — laboratory evaluation comes before any commercial commitment. Request a sample through the enquiry form with your substrate and process details.

Technical data sheets and safety data sheets are provided for supplied products. Where a grade is under development for a specific customer, documentation is issued as the specification is finalised.

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Tell us about your application

Substrate, process, cure capacity and the performance you need. That is enough for us to tell you whether Polyurethane Binders for Printing Inks is the right starting point.

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The more specific you are, the faster we can give a useful answer.

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