Industry News, Adhesives & Sealants

Croda’s Smart Approach for Sustainable Adhesives Used in Electronics

Croda’s Smart Approach for Sustainable Adhesives Used in Electronics

At this year’s FECIA conference, Croda showcased its smart approach to reach sustainability. Their approach is to: Offer, Support & Develop:

  1. Offer innovative environmentally friendly solutions
    1. Including natural, bio-derived products
    2. Safer/milder ingredients
  2. Support customers in meeting environmental regulations and CO2 reductions
    1. Support for certification and LCA
  3. Develop products that allow people to maximize performance and value, whilst:
    1. Reducing energy use
    2. Minimizing environmental impact of technology
    3. Improving efficiency

Adhesives in Electronics

Innovating for a high-performance and sustainable future. ©Croda

Innovating for a high-performance and sustainable future. ©Croda

To enhance the performance and sustainability profile of adhesives for electronics, use:

  • Bio-based building blocks
  • Epoxy functional toughening agent

These bring:

  • Increased impact resistance for longer lifetime
  • Excellent water barrier properties for durability and allowing use of aluminum for lightweight solutions
  • Improved multi-substrate adhesion
  • Enhanced flexibility

Priplast Bio-based Technology – Dimer-based Polyester Polyols

Adhesives and sealants on a PCB. ©Croda

Adhesives and sealants on a PCB. ©Croda

Features Benefits
Hydrocarbon Character
  1. Durability
  2. No ether linkage
    1. Stability against heat, oxygen and UV
  3. Hydrophobicity
    1. Hydrolytic stability
    2. Moisture barrier protection
    3. Adhesion to low surface-energy substrates
Non-crystalline Structure
  • Flexibility, Low Tg – Stress absorption also at low temperatures
  • No strain hardening – Long-lasting flexibility
  • Good flow and substrate wetting, no shrinkage
  • Good adhesion to a wide range of substrates
Green Characteristics
  • Derived from natural oils – up to 100% bio-based


Electronics, Sensors and Displays

Bio-based polyols for highperformance PU in automotive electronics
Application Function
Moisture barrier
  • Sealing, potting, encapsulation
  • Reliable bonding
  • Enabling use of aluminum
Optically clear adhesives
  • Sensor reliability
  • Display appearance
Durability, overall resistance
  • Water, heat, UV

B-Tough for Impact Strength of Epoxy Adhesives

Phase Separated Morphology

  1. B-Tough epoxy functional toughening agent
  2. Forms soft rubbery particles in the hard epoxy matrix
  3. Results in impact strength
  4. Toughness: Rubbery particles restrict crack growth
    1. B-Tough absorbs impact and thermal stress
    2. Reduces fatigue
    3. Improves T-peel strength
  5. While maintaining hardness and high-temperature performance
  6. In addition, B-Tough rubber domains are a barrier to moisture
  7. Moisture diffusion an order of magnitude lower than CTBN modified

B-Tough Matching the Polarity of the Epoxy System

Polarity of the expoxy system. ©Croda

Polarity of the expoxy system. ©Croda

There are three grades of B-Tough A available with a range of polarities to fit the epoxy system

  • Match B-Tough polarity to the epoxy system
  • Should be compatible enough to react
  • Becoming incompatible during cure, resulting in phase separation

Enhanced Impact Resistance

Fracture resistance of solid epoxy based adhesive. B-Tough A allows superior fracture resistance over unmodified epoxies and epoxy adduct of carboxyl-terminated butadiene nitrile rubber. Available in 3 different polarities to match with the epoxy polarity.

  • Improved Adhesion to Metal
  • Lap shear adhesion to steel
    • Lap shear adhesion on Mild and Stainless Steel
    • Adhesive force [MPa] (adhesive failure, or no break = NB)

Priamine in Adhesives

Dimer diamine for Polyamide, Epoxy and Polyimide

  • Formulation freedom to adjust melting point
  • To protect substrates from moisture
  • To improve adhesion to low polarity substrates (plastics)
  • To obtain flexible adhesives
  • Based on renewable raw material

Sustainability Impact

Life Cycle of Biobased vs. Fossil Fuel Based Products

Case Study 1 -Avoided Emissions through use of Priplast in double glazed windows

As well as measuring the intrinsic benefits of our products, we are increasingly looking at the extrinsic sustainability benefits of our products.

Priplast™ 3186
  • High performance protective barrier in glass insulation sealants
    Improved heat insulation
  • Avoids emissions associated with home heating; equivalent to 523 homes’ energy use for one year!
  • Improved bio-based content in end formulation
  • Increases the lifetime of the sealant to avoid extra manufacturing


Case Study 2 – Avoided Emissions through use of Priplast in LED light potting

Priplast™ 1838
  • High performance protective barrier in LED light potting or encapsulation
  • Improved lifetime of the LED in humid environments
  • Avoids emissions associated with LED manufacturing; equivalent to 13 homes’ energy use for one year
  • Improved bio-based content in end formulation
  • Increases the lifetime of the light to avoid additional manufacturing of an estimated 50 000 LEDs per year
  • Replacement of traditional light bulbs with LED avoids energy use equivalent to 161 homes’ energy use

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