MODIFIERS FOR ADHESIVE FORMULATIONS

STRUKTOL® POLYDIS® CTBN Modified Epoxy Resins
STRUKTOL® POLYCAVIT® ELASTOMER Modified Epoxy Resins
STRUKTOL® POLYPHLOX® Flame Retardants

High-performance adhesives and potting compounds based on reactive resins (epoxy, polyurethanes) are used in large quantities in a wide range of applications:

  • Automotive: car body construction
  • Transportation (railroads, shipbuilding): wagon construction, ship superstructures
  • Wind energy: rotor blades
  • Sports and leisure industry: golf clubs, bicycles, snowboards, etc.
  • Electrical potting compounds
  • Composites components

The versatile additives (prepolymers) from the STRUKTOL® product lines POLYDIS®, POLYCAVIT® and POLYPHLOX® are used where a high performance is required for

  • adhesive strength on oily steel,
  • adhesive strength,
  • tensile shear strength
  • hydrolysis resistance,
  • flexibility and impact strength,
  • thermal resistance and halogen-free flame retardancy.

Our prepolymers can be used with all conventional epoxy resins and curing agents, offering customers significant improvements in the technical characteristics of their material.

Our technical sales team is happy to assist customers in the selection of suitable modifiers, formulation and testing of finished systems.

CTBN modified epoxy resins are prepolymers that are obtained by reaction of nitrile rubber with epoxy resins. These versatile products offer significant improvement in technical properties such as impact strength, tensile shear strength, flexibility and adhesion to oily steel.  
Typical applications are adhesive formulations, coating systems, casting resins, prepregs and epoxy resin systems in the fiber composite industry.

Struktol® Polydis® 3604

Nitrile rubber modified epoxy resin

  • based on DGEBA
  • Resin replacement: 10-35 %
  • Epoxy equivalent weight: 330 g/Eq
  • Viscosity at 25 °C: 190 Pa.s
  • Appearance: yellowish, viscous resin
Struktol® Polydis® 3605

Nitrile rubber modified epoxy prepolymer based on DGEBA

  • Resin replacement: 10-35 %
  • Epoxy equivalent weight: 300 g/Eq
  • Viscosity at 25 °C: 50 Pa.s
  • Appearance: yellow, liquid resin
  • A lower vicous version of Struktol Polydis 3604 designed for easier processing at room temperature
Struktol® Polydis® 3606

Nitrile rubber modified epoxy prepolymer based on DGEBF

  • Resin replacement: 10-35 %
  • Epoxy equivalent weight: 300 g/Eq
  • Viscosity at 25 °C: 180 Pa.s
  • Appearance: yellowish liquid resin
Struktol® Polydis® 3610

Nitrile rubber modified epoxy prepolymer based on DGEBA

  • Resin replacement: 10-35 %
  • Epoxy equivalent weight: 600 g/Eq
  • Dyn. Viscosity at 80 °C: 100 Pa.s
  • Appearance: amber, solid resin, exhibiting cold flow
  • This product provides ultimate toughening and best adhesion especially on oily steel for 1-component-systems
Struktol® Polydis® 3611

Nitrile rubber modified epoxy prepolymer based on DGEBF

  • Resin replacement: 10-35 %
  • Epoxy equivalent weight: 550 g/Eq
  • Viscosity at 80 °C: 30 Pa.s
  • Appearance: amber, resin paste
  • This product provides ultimate toughening and best adhesion especially on oily steel for 1-component-systems
Struktol® Polydis® 3614

CTBN modified Bisphenol-A Epoxy Resin (DGEBA)

  • Improvement of lap shear strength, impact strength in adhesive systems
  • Minimal influence on glass transition temperature and Young's modulus
  • Dosage (replaces base resin): 10-40 %
  • Epoxy equivalent weight: 330 g/Eq
  • Elastomer content: 40 %
  • Dyn. viscosity (25 °C): 470 Pa.s
  • Appearance: yellowish, highly viscous liquid
Struktol® Polydis® 3615

CTBN modified Bisphenol-A Epoxy Resin (DGEBA) for electronic applications

  • Improvement of lap shear strength, impact resistanceh in adhesive systems
  • Minimal influence on glass transition temperature and Young's modulus
  • Very low chlorine content
  • Particularly suitable in the electronics sector
  • Dosage (replaces base resin): 10-35 %
  • Epoxy equivalent weight: 300 g/Eq
  • Elastomer content: 40 %
  • Dyn. viscosity (25 °C): 250 Pa.s
  • Hydrolysable chlorine: 250 ppm
  • Appearance: amber, viscous liquid
Struktol® Polydis® 3616

Bimodal, elastomer-modified polyalkylene epoxy resin

  • Improvement of flexural strength, peel resistance and impact strength in adhesive systems
  • bimodal modified epoxy resin
  • low viscosity of the prepolymer
  • Dosage (replaces base resin): 5-25 %
  • Epoxy equivalent weight: 650 g/Eq
  • Elastomer content: 40 %
  • Dyn. viscosity (25 °C): 9 Pa.s
  • Appearance: amber, viscous liquid
Struktol® Polydis® 3618

CTBN modified Epoxy Resin (aliphatic diglycidylether)

  • Improvement of lap shear strength, impact resistance, T-peel strength
  • Outstanding adhesion especially on oily steel
  • Lower viscosity than Polydis® 3604, 3614, 3615
  • Dosage (replaces base resin): 20-60%.
  • Epoxy equivalent weight: 285 g/Eq
  • Dyn. viscosity (25 °C): 10 Pa.s
  • Appearance: yellowish, highly viscous liquid
Struktol® Polydis® 3633

Bimodal elastomer-modified epoxy resin (DGEBA/DGEBF)

  • Improvement of T-peel strength, lap shear strength, impact resistance
  • Can be used as a modified raw material component in epoxy resin formulations
  • Minor influence on glass transition temperature and Young's modulus
  • Dosage (replaces base resin): 40-100 %
  • Epoxy equivalent weight: 220 g/Eq
  • Elastomer content: 16 %
  • Dyn. viscosity (25 °C): 25 Pa.s
  • Appearance: amber liquid resin
Struktol® Polydis® 3636

CTBN-modified high molecular epoxy resin

  • Improvement of T-peel strength, lap shear strength, impact resistance
  • Can be used as a modified raw material component in epoxy resin formulations
  • Dosage (replaces base resin): 40-100 %
  • Epoxy equivalent weight: 300 g/Eq
  • Dyn. viscosity (40 °C): 200 Pa.s
  • Appearance: yellowish, highly viscous resin
Struktol® Polydis® 3652

CTBN-modified epoxy prepolymer based on solid resin

  • Improvement of T-peel strength, lap shear strength, impact resistance
  • Combines properties of Polydis® 3614 with the good properties of high molecular weight epoxy resins
  • Well suited for the formulation of reactive hot-melt adhesives
  • Dosage (replaces base resin): 50-100 %
  • Epoxy equivalent weight: 360 g/Eq
  • Dyn. viscosity (80 °C): 15 Pa.s
  • Appearance: yellowish, paste-like resin
Struktol® Polydis® 3670

CTBN modified Epoxy-Novolak Resin

  • Improvement of impact resistance, T-peel and bending strength, temperature and chemical resistance
  • Dosage (replaces base resin): 20-50 %
  • Epoxy equivalent weight: 250 g/Eq
  • Elastomer content: 25 %
  • Dyn. viscosity (80 °C): 10 Pa.s
  • Appearance: yellowish, highly viscous liquid

The elastomer modified epoxy resins are  rubber-free prepolymers that are created by the reaction of polymers with epoxy resins. The polymers used for this purpose primarily belong to the following groups: dimer fatty acids, polyols, polyurethanes, polyetheramines or thermoplastics.

These products, like CTBN-modified epoxy resins, improve technical characteristics such as impact strength, lap shear strength and adhesive strength. Depending on the modification, the handling of the rubber-free epoxy resins is easier, with an improvement in performance similar to the CTBN-modified epoxy resins.

Typical applications are adhesive formulations, coating systems, casting resins, prepregs and epoxy resin systems in the fiber composite industry.

Struktol® Polycavit® 3511

low viscous polyetheramin-modifizied epoxy resin

  • Improvement of flexibility, impact strength at low viscosity
  • well suited for the formulation of 1K and 2K adhesive systems
  • Dosage (replaces base resin): 10-35 %
  • EEW: 315 g/Eq
  • Toughener content: 40 %.
  • Dyn. viscosity(25 °C): 35 Pa.s
  • Appearance: clear, slightly yellowish liquid
Struktol® Polycavit® 3530

Polyurethane prepolymer blended with epoxy resin

  • Improvement of peel strength, tensile shear strength, impact strength
  • suitable in particular for the formulation of 1-component structural adhesives
  • Synergistic effects with CTBN-Tougheners
  • Application temperatures -40 to +150°C
  • Dosage (replaces base resin): 8-30 %
  • EEW: 460 g/Eq
  • Toughener content: 60 %.
  • Viscosity at 40 °C: 25 Pa.s
  • Appearance: yellowish liquid
Struktol® Polycavit® 3550

Epoxy functional polyester/polyether Copolymer

  • Improvement of peel strength, impact strength, flexural strength
  • improved adhesion on galvanized steel
  • suitable for the formulation of adhesive systems and resin system for composites
  • applicable up to 200°C without loss of properties
  • Dosage (replaces base resin): 5-15 %
  • EEW: 1,800 g/Eq
  • Toughener content: 100 %.
  • Dyn. viscosity (25 °C): 400 Pa.s
  • Appearance: yellowish, viscous liquid
Struktol® Polycavit® 3570

Polyetheramine-modified epoxy resin

  • Improvement of peel strength, tensile shear strength,
  • improved adhesion on galvanized steel
  • suitable for the formulation of adhesive systems
  • Dosage (replaces base resin): 10-25 %
  • EEW: 325 g/Eq
  • Toughener content: 40 %.
  • Dyn. viscosity (25 °C):  95 Pa.s
  • Appearance: yellowish, viscous liquid
Struktol® Polycavit® 3622

Polyol modified epoxy prepolymer based on DGEBA

  • Improvement of tensile and peel strength, flexibility, impact strength especially at low temperatures
  • almost no inherent color
  • low viscosity
  • suitable for the formulation of casting compounds and coating systems
  • Dosage (replaces base resin): 10-35 %
  • EEW: 330 g/Eq
  • Toughener content: 40 %.
  • Dyn. viscosity (25 °C): 10 Pa.s
  • Appearance: clear, slightly yellowish liquid
Struktol® Polycavit® 3625

Polyurethane modified epoxy resin

  • Improvement of lap shear strength, impact strength
  • Properties comparable to CTBN prepolymers, but significantly lower viscosity and higher reactivity
  • Dosage (replaces base resin): 50-100 %
  • EEW: 205 g/Eq
  • Toughener content: 40 %.
  • Dyn. viscosity (25 °C): 10 Pa.s
  • Appearance: Clear, slightly yellowish liquid
Struktol® Polycavit® 3632

Dimer acid modified prepolymer (DGEBA)

  • Improving peel strength, flexibility
  • Epoxy-functional prepolymer of higher viscosity for the flexibilization of epoxy resin systems
  • especially suitable for use in coatings and cable sealing compounds
  • Dosage (replaces base resin): 10-40%
  • EEW: 600 g/Eq
  • Toughener content: 40 %.
  • Dyn. viscosity (50 °C): 47 Pa.s
  • Appearance: yellowish, highly viscous liquid
Struktol® Polycavit® 3637

Dimer acid modified prepolymer (DGEBA)

  • "Improving peel strength, flexibility
  • low viscosity version of Polycavit® 3632
  • especially suitable for use in coatings and cable sealing compounds"
  • Dosage (replaces base resin): 10-40%
  • EEW: 470 g/Eq
  • Toughener content: 30 %.
  • Dyn. viscosity (50 °C) : 8 Pa.s
  • Appearance: yellowish-transparent, highly viscous liquid
Struktol® Polycavit® 3662

Polyalkylenglykol modified epoxy prepolymer

  • improvement of peel strength, flexibility, impact strength, bending and tensile shear strength
  • produces high glass transition temperatures in the formulated product and good UV resistance
  • Dosage (replaces base resin): 10-40%
  • EEW: 260 g/Eq
  • Toughener content: 40 %.
  • Dyn. viscosity (25 °C) : 2 Pa.s
  • Appearance: light yellow, viscous liquid

Reactive flame retardants based on phosphorous-organic compounds such as DOPO are a very effective and toxicologically safe alternative to halogen-containing flame retardants.

STRUKTOL® POLYPHLOX® products are chemically pre-treated so that they later react with the matrix in epoxy resin systems. This has little effect on the mechanical and chemical properties of the cured EP matrix, so that for many applications the respective optimum property profile and good fire protection (e.g. UL94 V0) can be achieved.

The products can often be combined well with synergists such as APP, melamine cyanurates or ATH, so that the fire protection effect can be further enhanced.

Struktol® Polyphlox® 3700

Hydroxy functional phosphoric co-monomers

  • Dyn. viscosity at 25 °C: 125 Pa.s
  • Phosphorous Content: 5 %
  • Hydroxyl number: 185 mgKoH/g
Struktol® Polyphlox® 3735

Multi-functional, organophosphorous modified epoxy Novolak resin (based on Struktol® Polyphlox® 3710)

  • Epoxy equivalent weight: 350 g/Eq
  • Softening point: 80 °C
  • Phosphorous Content: 3.8 %
  • Appearance: transparent – yellowish solid resin
Struktol® Polyphlox® 3735 S

Multifunctional, organophosphorus modified epoxy novolak resin (based on Struktol® Polyphlox® 3710)
Solvent content 20 % (MEK/xylene

  • Reactive, flame retardant epoxy resin (e.g. to meet UL-94 V0 requirements)
  • For formulation of epoxy resin systems in applications like powder coatings, prepregs and composite materials
  • DOPO (Polyphlox® 3710) modified epoxy novolak, higher functionality
  • Epoxy equivalent weight: 425 g/Eq
  • Softening point: 80 °C
  • Phosphorus content: 3.8 % (solids content)
  • MEK/xylene content: 20
  • Appearance: transparent yellowish solid resin
Struktol® Polyphlox® 3742

Multifunctional, organophosphorus modified epoxy resin (based on Struktol® Polyphlox® 3710)

  • Halogen-free flame retardant especially suitable for prepregs and composite materials, e.g. in aerospace and transportation
  • DOPO (Polyphlox® 3710) modified epoxy resin
  • Epoxy equivalent weight: 370 g/Eq
  • Softening point: 57 °C
  • phosphorus content: 4.0 %
  • appearance: yellowish, semi-solid resin
Struktol® Polyphlox® 3743

Multifunctional, organophosphorus modified epoxy resin (based on Struktol® Polyphlox® 3710)

  • Halogen-free flame retardant especially suitable for prepregs and composite materials, e.g. in aerospace and transportation
  • DOPO (Polyphlox® 3710) modified epoxy resin
  • Epoxy equivalent weight: 350 g/Eq
  • Dyn. viscosity (80 °C): 13 Pa.s
  • Phosphorus content: 4.0 %
  • Appearance: yellowish, semi-solid resin