EBECRYL® 4397

Formulations with EBECRYL® 4397 can be used for;

• UV/EB curable, two component polyurethane coatings
• One component adhesion primer

EBECRYL® 4397 can be combined with hydroxyl functional resins to formulate coatings which cure by dual processes; UV/EB induced polymerization and NCO/OH reaction.
The product is also used in straight UV/EB curing coatings to improve the adhesion on substrates such as plastic, metal and exotic woods.

• The viscosity of EBECRYL® 4397 can be reduced using standard reactive diluents such as dipropylene glycol diacrylate (DPGDA), 1,6-hexanediol diacrylate (HDDA)(1), isobornyl acrylate (IBOA), and trimethylolpropane triacrylate (TMPTA), and non-reactive solvents.
• Suitable solvents are esters, ketones and aromatic hydrocarbons.Non-reactive solvents must be evaporated prior to curing. Only pure grade solvents should be used (max 0.05% water).
• EBECRYL® 4397 should not be thinned below a non-volatile content of 40%.
• Prolonged storage of a solution with lower binder content may result in turbidity, sedimentation or even gelling.
• Reactive diluents and solvents containing reactive groups such as hydroxyl or amine groups strongly influence pot life and storage stability.
• Coatings containing EBECRYL® 4397 may be applied by spraying, curtain or roller coated at ≤ 100g/m² coat weight.
• After an adequate flash-off time of solvents (if any), the coatings are UV/EB cured. This creates a tack free and dust-dry surface.
• Following UV/EB curing, any post-reaction of NCO/OH groups takes place at room temperature or is forced by heat.
• This results in good adhesion and good mechanical and chemical resistance of the coating.
• EBECRYL® 4397 has good compatibility with esters, ketones and aromatic hydrocarbons such as ethyl acetate, butyl acetate, methoxypropyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, xylene and mixtures thereof.
• Because of the many possible combinations with thinners and solvents, the compatibility and storage stability should be tested in each individual case.

• Care should be taken not to expose the product to high temperature conditions, direct sunlight, ignition sources, oxidizing agents, alkalis or acids.
• This might cause uncontrollable polymerization of the product with the generation of heat.
• Storage and handling should be in stainless steel, amber glass, amber polyethylene or baked phenolic lined containers.
• Procedures that remove or displace oxygen from the material should be avoided.
• Do not store this material under an oxygen free atmosphere.
• Dry air is recommended to displace material removed from the container.
• Wash thoroughly after handling.
• Keep container tightly closed.
• Use with adequate ventilation.