MBS Impact Modifier is a copolymer of Methyl Methacrylate (M), Butadiene (B), and Styrene (S). It is designed to increase impact resistance and toughness in rigid PVC applications without affecting transparency or processability. MBS is especially used where clarity and high mechanical strength are needed.
| Property | Typical Value |
|---|---|
| Appearance | White powder |
| Bulk Density | 0.45–0.55 g/cm³ |
| Volatile Content | ≤ 1.0% |
| Particle Size | ≥ 98% pass through 40 mesh |
| Glass Transition Temperature | ~ -40 °C |
| Problem | Why MBS Helps |
|---|---|
| Low impact resistance of rigid PVC | MBS boosts toughness without sacrificing clarity |
| Yellowing or whitening during weathering | MBS has UV-stable grades for outdoor use |
| Need for transparent tough products | MBS is non-refractive and keeps light transmittance high |
| Uneven processing | MBS ensures stable fusion and dispersion |
Q1: Does MBS affect the transparency of PVC?
No, MBS is specifically designed for clear and translucent applications.
Q2: What is the dosage for MBS in formulations?
Usually 5–12 phr depending on the level of impact improvement needed.
Q3: Can MBS be used with other impact modifiers?
Yes, MBS can be blended with CPE or acrylic modifiers as needed.
