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EBECRYL® 4654 is a type of aliphatic urethane acrylate supplied in a solution with n-butyl acetate. It's designed for use in UV (ultraviolet) and EB (electron beam) energy-curable coatings. When applied and dried, it forms hard polymers with excellent properties such as chemical and mechanical resistance, resistance to yellowing, and good exterior durability.

Here's a breakdown of its key features and applications:

Performance Highlights:

• Physically dry after solvent evaporation
• Exhibits good chemical and mechanical resistance properties
• High resistance to yellowing and excellent exterior durability

Suggested Applications:

• Formulation of UV/EB energy-curable coatings, particularly for automotive clear coats by spray application.

Formulating:

• Reactive diluents such as dipropylene glycol diacrylate (DPGDA), 1,6-hexanediol diacrylate (HDDA), isobornyl acrylate (IBOA), and trimethylolpropane triacrylate (TMPTA) can be used to adjust viscosity.
• Careful selection of reactive diluents and solvents is crucial for achieving desired properties and storage stability.
• Addition of standard commercial photo initiators is required for UV curing. Typical levels are 4-6%, but this may vary based on reactivity requirements.
• For EB curing, ensuring a low oxygen atmosphere is essential to avoid surface inhibition.

Typical Physical Properties:

• Acid number: 1 mg KOH/g
• Color (Apha): 100
• Density: 1.02 g/cm³ at 20°C
• Flash point: 72°C
• Solvent content (n-butyl acetate): 40%
• Viscosity at 23°C: 750 mPa.s

Precautions:

• Refer to the Safety Data Sheet (SDS) for hazard information, recommended protective equipment, and procedures.
• Avoid exposure to high temperatures, direct sunlight, ignition sources, oxidizing agents, alkalis, or acids.
• Store in appropriate containers and avoid oxygen-free atmospheres.
• Use with adequate ventilation and wash thoroughly after handling.

Storage and Handling:

• Store in stainless steel, amber glass, amber polyethylene, or baked phenolic lined containers.
• Avoid procedures that remove or displace oxygen from the material.
• Keep containers tightly closed and use with adequate ventilation.

It's important to carefully follow the recommended procedures and precautions outlined in the technical datasheet and the Safety Data Sheet (SDS) to ensure safe handling and optimal performance of EBECRYL® 4654.

EBECRYL® 4491 is an unsaturated aliphatic urethane acrylate primarily used in the formulation of ultraviolet (UV) and electron beam (EB) curable coatings. Here are some key details about it:

• Introduction: EBECRYL® 4491 is recommended for UV and EB curable coatings. It is supplied as 80% in isobornyl methacrylate.
• Performance Data: Coatings made with EBECRYL® 4491 exhibit high flexibility and elongation at break, with UV-cured films displaying rubber-elastic properties.
• Suggested Applications: It's used to formulate highly flexible radiation-curable coatings for various substrates including wood, cork, furniture, paper, parquet, plastics, glass, and films. It can also be used for temporary (strip) coatings.
• Typical Values and Properties:
  • Viscosity at 23°C: Approximately 90,000 mPa.s
  • Color (Alpha): Approximately 100
  • Density at 20°C: Approximately 1.13 g/cm³
  • Acid Number: Approximately 2 mg KOH/g
  • Hydroxyl Content: Approximately 0.1%
  • Flash Point: Approximately 97°C
  • Tensile Strength: Greater than 5 N/mm²
  • Elongation at Break: Greater than 250%
• Suggested Formulations: Depending on the application, coatings can be adjusted using standard reactive thinners or solvents such as butyl acetate. Careful selection of reactive thinners is important to maintain desired properties.
• Storage and Handling: It should be stored in original sealed containers at recommended temperatures (+5 to +35°C) and protected from intense radiation, heat, and foreign material. Phase separation may occur at low temperatures, but it's reversible by stirring and slight heating.
• Statutory Labeling: Safety Data Sheet should be referred to for statutory labeling information.

Overall, EBECRYL® 4491 is a versatile material suitable for various flexible coating applications, offering high performance and compatibility with UV and EB curing methods.

EBECRYL® 4250 is an undiluted isocyanate functional urethane acrylate designed for use as an adhesion promoter in UV/EB coatings and in two-component dual cure systems for coatings on wood, plastic, and metal.

Suggested Applications:

• Adhesion promotion in UV/EB curing coatings
• UV/EB curable, two-component polyurethane coatings
• One-component adhesion primer

Formulating:

• The viscosity of EBECRYL® 4250 can be reduced using standard reactive diluents such as dipropylene glycol diacrylate (DPGDA), 1,6-hexanediol diacrylate (HDDA), isobornyl acrylate (IBOA), and trimethylolpropane triacrylate (TMPTA).
• Suitable solvents are esters, ketones, and aromatic hydrocarbons.
• Reactive diluents and solvents containing reactive groups such as hydroxyl or amine groups strongly influence pot life and thus storage stability.

Physical Properties:

• Color, APHA max: 100
• Density, g/cm³ at 20°C: 1.10
• Flash point, °C: > 100
• Functionality, acrylate groups: 3.4
• Functionality, NCO groups: 1.4
• NCO content, %: 5
• Viscosity, 23°C, mPa.s: 2000

Precautions:

• Before using EBECRYL® 4250, refer to the Safety Data Sheet (SDS) for information on identified hazards, recommended personal protective equipment, and procedures.
• Avoid exposure to high temperature conditions, direct sunlight, ignition sources, oxidizing agents, alkalis, acids, or water.
• Storage and handling should be in appropriate containers such as stainless steel, amber glass, amber polyethylene, or baked phenolic lined containers.
• Procedures that remove or displace oxygen from the material should be avoided.
• The product is sensitive to moisture, and skin formation may occur in opened containers.
• Keep the container tightly closed and use with adequate ventilation.

Storage and Handling:

• Store EBECRYL® 4250 in accordance with the recommended temperature range specified in the SDS.
• Care should be taken to avoid exposure to conditions that may cause uncontrollable polymerization, such as high temperatures or exposure to incompatible substances.
• Use dry air to displace material removed from the container, and wash thoroughly after handling.