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Highly reactive methylphenylsilicone resin with controlled molecular weight distribution.
Excellent thermal stability and oxidative resistance up to 250 °C in air.
Soluble in common organic solvents including xylene, toluene, and MEK.
Enables efficient crosslinking with alkoxy- or hydroxyl-functional curing agents.
Provides superior weatherability and UV resistance in cured coatings and composites.
High-performance heat-resistant coatings for exhaust systems and industrial ovens.
Matrix resin in silicone-modified organic-inorganic hybrid composites.
Binders for ceramic and metal pigment dispersions in high-temperature paints.
Key intermediate for synthesizing tailored silicone-organic copolymers.
Component in flame-retardant intumescent coating formulations.
| Chemical Type | Methylphenylsilicone resin (partially condensed) |
| Product Form | Liquid concentrate |
| Appearance | Clear, colorless to pale yellow viscous liquid |
| Solvent Content | Approx. 40–50 wt% in aromatic hydrocarbons (e.g., xylene) |
| Viscosity (25 °C) | 1,200–2,500 mPa·s |
| Non-Volatile Content | 50–60 wt% |
| Reactive Groups | Alkoxy (methoxy/ethoxy) and silanol functionality |
| Storage Stability | ≥12 months at 5–30 °C in sealed container |
Q1: What is the primary function of SILRES IC 678 in coating and ink formulations?
A: SILRES IC 678 serves as a reactive silicone resin intermediate that imparts improved substrate wetting, leveling, and surface slip—while maintaining compatibility with organic polymer systems. It enhances film uniformity and contributes to long-term hydrophobicity and mar resistance without significantly compromising adhesion or cure kinetics.
Q2: Is SILRES IC 678 compatible with UV-curable and thermally cured systems?
A: Yes, SILRES IC 678 is formulated for broad compatibility with both UV-curable acrylate systems and thermally cured resins—including polyesters, acrylics, and alkyds. Its reactive silanol groups allow covalent integration into the crosslinked network under appropriate curing conditions, supporting stable performance across diverse chemistries.
Q3: How should SILRES IC 678 be incorporated into a formulation?
A: SILRES IC 678 is typically added during the let-down or post-additive stage under moderate agitation. It is recommended to avoid prolonged high-shear mixing or exposure to strong acids/bases prior to incorporation, as these may affect its reactivity profile. Dosage depends on formulation requirements but generally ranges from 0.1% to 2% by weight relative to total solids.
Q4: Does SILRES IC 678 require special storage or handling precautions?
A: SILRES IC 678 should be stored in tightly sealed containers under dry, cool conditions (below 30 °C) and protected from moisture and direct sunlight. While not classified as hazardous for transport under standard conditions, it is hygroscopic and may undergo gradual condensation if exposed to ambient humidity over time—therefore, proper container integrity and handling practices are advised.
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