ADEKA REASOAP ER 20
New Reactive Surfactant
Besides the use as emulsifier, ADEKARESOAP can be used as a monomer for resin modification
enabling radical polymerization.
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Product Description
ADEKA REASOAP ER-20 is a nonionic reactive surfactant manufactured by ADEKA Corporation (Japan). It belongs to the ER/SR series of allyl-ether type emulsifiers, which carry a radical-polymerizable group in their molecular structure. Unlike conventional nonyl phenol (NP) type emulsifiers, ER-20 uses an alkyl group in place of the nonyl phenol group, making it a nonyl-phenol-free (NP-free) alternative suitable for regulatory environments that restrict NP-based surfactants.
With 20 moles of ethylene oxide (EO) and 75% active solid content, ER-20 is designed for use as a copolymerizable emulsifier in emulsion polymerization, and can also act as a monomer for resin modification through radical polymerization. It is compatible with a wide range of monomer systems, including acrylic, acrylic/styrene, EVA, and SBR.
Physical Properties
| NONION | ANION | |||||||
| ER-10 | ER-20 | ER-30 | ER-40 | SR-10 | SR-20 | SR-1025 | SR-3025 | |
| EO mol | 10 | 20 | 30 | 40 | 10 | 20 | 10 | 30 |
| Solid content (％) | 100 | 75 | 65 | 60 | 100 | 100 | 25 | 25 |
| Counter ion | --- | --- | --- | --- | NH4 + | NH4 + | NH4 + | NH4 + |
| Solvent | --- | water | water | water | --- | --- | water | water |
| Color（APHA） | 100 | 100 | 100 | 100 | 5(G) | 5(G) | 2(G) | 2(G) |
| pH（2,5 % aq.） | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Viscosity (mPa･s 25o C) | 120 | 410 | 790 | 1400 | 7200 | 10000 | 20 | 20 |
● Nonyl-phenol-free (NP-free) alternative to conventional reactive emulsifiers
● Copolymerizes with monomers to form a covalently bonded, non-migrating surfactant layer
● Improves water resistance, adhesion, weather resistance, and heat resistance of the resulting resin film
● Good emulsification and copolymerization performance across acrylic, acrylic/styrene, EVA, and SBR monomer systems
● Produces stable polymer emulsions suitable for coatings, adhesives, and binder applications
Application
ADEKA REASOAP ER-20 is used as an emulsifier in emulsion polymerization for coatings, adhesives, and binder resins. It is suitable for acrylic, acrylic/styrene, EVA, and SBR monomer systems, and is often selected where nonyl-phenol-free formulations are required without sacrificing water resistance or film performance.
For applications requiring anionic emulsification characteristics or higher chemical stability against electrolytes, the related SR series (SR-10, SR-20, SR-1025, SR-3025) can be used alone or in combination with ER-20. Data from ADEKA's internal testing shows that combining an anionic SR-series emulsifier with a nonionic ER-series grade such as ER-20 or ER-30 can meaningfully improve chemical stability against calcium chloride and frozen-thaw stability compared with using an SR-series emulsifier alone.
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