Chemical Name 2,4‑Diphenyl‑4‑methyl‑1‑pentene
Common Trade Name α‑Methylstyrene Dimer (AMSD)
CAS Number 6362‑80‑7EC Number 228‑846‑8
Molecular Formula C₁₈H₂₀
Molecular Weight 236.35 g/molHS‑Code 290290
2. Chem‑Physical Properties
Appearance Colorless to nearly colorless clear liquid
Odor Mild aromatic odorDensity (20 °C) 0.985‑0.992 g/cm³
Refractive index n₂₀/D 1.565‑1.572
Boiling point 161 °C @5 mmHg; 316 °C @760 mmHg
Flash point (closed cup) ≥150 °C
Melting point −23 °CViscosity (20 °C) ~18 mm²/s
Vapor pressure (25 °C) <0.1 hPa
Solubility in water Practically insoluble (0.00023 g/L @20℃)
Solubility Miscible with hydrocarbons, aromatic solvents; insoluble in water
LogP 6.2 @25℃
3. Quality Specification (Industrial Grade)
| Test Item | Unit | Specification | Typical Result | Test Method |
|---|---|---|---|---|
| Appearance | — | Colorless clear liquid | Complies | Visual |
| Total unsaturated dimer (GC) | % | ≥98.0 | 98.7 | GC‑FID |
| 2,4‑Diphenyl‑4‑methyl‑1‑pentene | % | ≥92.0 | 94.1 | GC‑FID |
| Isomer (2‑pentene type) | % | ≤6.0 | 4.2 | GC‑FID |
| Alpha‑methyl styrene monomer | % | ≤0.5 | 0.12 | GC‑FID |
| Saturated dimer impurity | % | ≤1.0 | 0.45 | GC‑FID |
| APHA Color | — | ≤50 | 20 | Colorimeter |
| Moisture | % | ≤0.10 | 0.05 | Karl‑Fischer |
4. Application & Use
Chain transfer agent (CTA) for free‑radical polymerization of polystyrene (PS), AS resin, ABS, SBR latex and acrylic polymers; control molecular weight & molecular‑weight distribution, non‑mercaptan type, low odor, no polymer discoloration.
Cross‑linking co‑agent and scorch retarder for LDPE / XLPE cable insulation compounds.
Organic synthesis intermediate for specialty polymer additives.
Feature: Alternative to mercaptan chain transfer agents, eliminate sulfur‑odor issues in finished polymer goods.
5. Packing
Standard packing: 200 kg net steel drum
Bulk: ISO tank container
6. Storage & Transportation
Storage
Store in cool, dry, well‑ventilated warehouse, temperature 10‑30 °C. Keep container tightly closed.
Keep away from strong oxidizing agents, direct sunlight and heat sources.
Avoid prolonged air exposure. Ground containers during transfer to prevent static charge accumulation.
Transportation
UN‑Number：UN 3082Hazard Class：9 (Environmentally hazardous substance)
Packing group：III
Proper Shipping Name：Environmentally hazardous substance, liquid, n.o.s. (2,4‑Diphenyl‑4‑methyl‑1‑pentene)
Not flammable liquid class; marine pollutant.
Avoid mixing with oxidizing materials during shipment.
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