Oxazoline Group-Containing Water-Soluble Polymer: EPOCROS™ WS Series Oxazoline group-containing water-soluble polymer
- Applications
- Functions
Basic Information
EPOCROSTM is a reactive polymer with oxazoline groups on the side chain and is used as a cross-linking agent for water-based resins. Among the water-based polymers developed to address environmental issues and the increasing use of water-based products due to VOC regulations and desolventing, the EPOCROSTM WS series is a “water-soluble type” with the following structure.
Features and Properties
- High Reactivity with Carboxyl Groups in Waterborne Resin
- Higher reactivity than water-based crosslinkers such as epoxy, melamine, blocked isocyanate
- VOC free (EPOCROS™ WS-300 and EPOCROS™ WS-700)
- High crosslinking density with a small amount added
- Long Pot Life, One-Component Type (when mixed with waterborne resin containing neutralized carboxyl groups)
- Improves water resistance, solvent resistance, heat resistance, and the strength of films, etc.
- Adhesion-imparting possible to PET, OPP, PVC, etc.
- Fast drying
- Low toxicity (Ames Test: Negative, Primary Skin Irritation Test: No irritation)
Reactivity with Functional Groups of EPOCROS™ WS
The oxazoline groups of EPOCROS WS react most effectively with the carboxyl groups of water-based resins. They also react with aromatic thiol and phenol groups, but do not react with alcoholic hydroxyl groups.
Reaction Mechanism of EPOCROS™ WS (Oxazoline Groups) and Carboxy Groups
After the reaction between oxazoline groups and carboxy groups, stable amide ester bonds are formed, and no by-products are generated. The reaction between oxazoline groups and carboxy groups proceeds slowly at room temperature, but becomes significantly faster at temperatures above 100 ℃.
Substrate Adhesion via Oxazoline Groups
By incorporating EPOCROS WS, adhesion is improved through crosslinking between the oxazoline groups and the carboxyl groups of the water-based resins, and through interaction between the oxazoline groups and the substrate’s surface functional groups.
It can be used to improve adhesion to metal and plastic substrates, as a primer for optical PET films, and as a treatment for PET fibers.
WS Series Product Lineup
| EPOCROS™ WS-300 | EPOCROS™ WS-500 | EPOCROS™ WS-700 | |
|---|---|---|---|
| Appearance | Colorless or pale red liquid | Pale yellow, transparent liquid | Pale yellow, transparent liquid |
| Non-Volatile Matter (wt%) | 10 | 39 | 25 |
| Solvent | Water | Water/1-Methoxy-2-Propanol | Water |
| pH | 7-10 | 8-10 | 7-10 |
| Main Chains | Acrylic | Acrylic | Acrylic |
| WPO* (g-solid/eq.) | 130 | 220 | 220 |
New Crosslinking Technology
A new technology of mixing and heating emulsions containing COOH groups with a specific neutralization ratio improves the reactivity of the functional groups and lowers the curing temperature from the conventional 100°C to 80°C.
For more details, please refer to the short video below or contact us.
Applications
