| Customization: | Available |
|---|---|
| CAS No.: | 114697-07-3 |
| Formula: | / |
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Description
SiSR-255A is a hydroxy-functional, low molecular weight methyl phenyl silicone resin intermediate. The hydroxy group imparts good reactivity with other organic resins like alkyds, phenolics, epoxies, acrylics, etc. The condensation reaction is:
=SiOH + HOC= → =Si-O-C= + H2O
The resins modified with SiSR-255A features excellent weather resistance and heat resistance compared with unmodified resins.
Product Data
| Item | Value |
| Appearance | Flake solid |
| Solid Content,% | More than 97 |
| Specific gravity, 25ºC | 1.00 |
| Softening point, ºC | 35-45 |
| Volatile, 150ºC, 2h,% | Less than 3 |
Notes: these data are for reference only and should not be used as preparation specifications.
Application
• Maintenance, coil coating and architectural finishes based on organic copolymers modified with SiSR-255A resin exhibit good chalk resistance and retain their color and gloss after years of outdoor exposure.
• High-temperature finishes prepared with silicone-organic copolymers and cold blends have excellent gloss and color retention and can be used on space heaters, ovens, incinerators and similar high temperature appliances.
• Silicone organic blends containing SiSR-255A may also be used in powder coating applications where improved weatherability and heat resistance are required.
How to use
SiSR-255A can be copolymerized or cold blended
with a variety of organic resins. Sufficient excess carbinol functionality must be provided for optimum compatibility and resin stability.
Cold blending with SiSR-255A is more cost-effective compared with copolymerization, but limits the organic
resin selection because of compatibility.
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