Butyl Acrylate (2-Propenoic acid, butyl ester)

   CAS No.: 141-32-2
   Synonyms / IUPAC Name: Butyl acrylate; 2-Propenoic acid, butyl ester
   Molecular Formula: C₇H₁₂O₂
   Molecular Weight: 128.17 g/mol

Physicochemical Properties (Typical)

• Appearance: Clear, colourless liquid with a sharp, fruity ester-like odour
• Melting Point: ~ -64 °C
• Boiling Point: ~ 145–148 °C (at 1 atm)
• Density: ~ 0.89 g/cm³ at 25 °C
• Solubility: Very slightly soluble in water (≈ 1.4 g/L at 20 °C)
• Flash Point: ~ 38–40 °C (closed cup)
• Explosive Limits: Approx. Lower 1.1–1.5% vol; Upper ~7.8–9.9% vol in air

Purity & Quality Standards

• Purity: Typically ≥ 99% assay for high-grade monomer use
• Appearance: Clear, free from visible impurities or haze
• Analytical Methods: Gas chromatography for assay and monitoring of residual monomer or inhibitors
• Stability: Commercial material contains polymerisation inhibitors (e.g., MEHQ) to prevent premature polymerisation

Applications / Uses

• Monomer for production of poly(butyl acrylate) and copolymers used in adhesives, paints, coatings, sealants, and inks
• Component in formulation of acrylic emulsions for flexible polymers, textile, paper, and leather treatments
• Intermediate in speciality chemical synthesis where acrylate reactivity is required

Safety & Handling

• Hazard Classification: Highly flammable liquid and vapour; may cause skin and eye irritation; may be sensitising
• Health Hazards:
• Inhalation: Vapours may irritate the respiratory system and cause dizziness
• Skin/Eye Contact: May cause irritation; contact may lead to redness or sensitization
• Precautions:
• Use in well-ventilated area or under local exhaust ventilation
• Keep away from heat, sparks, open flames and hot surfaces – static discharge hazard
• Wear appropriate protective gloves, eye/face protection, and flame-resistant clothing
• Reactivity / Incompatibilities: Avoid strong oxidisers, acids, alkalis and amines; monomer may polymerise under catalyst/heat
• First Aid:
• Inhalation: Move to fresh air; keep comfortable for breathing; seek medical attention if symptoms persist
• Skin: Remove contaminated clothing; wash skin thoroughly with soap and water
• Eyes: Rinse cautiously with water for several minutes; seek medical attention if irritation continues
• Ingestion: Rinse mouth; do not induce vomiting; seek immediate medical attention

Packaging & Storage

• Packaging: Supplied in sealed solvent-compatible containers rated for flammable liquids (e.g., steel or lined drums)
• Storage Conditions: Store in a cool (<30 °C), dry, well-ventilated area away from sources of ignition, direct sunlight and incompatible materials; keep container tightly closed
• Shelf Life: When stored under recommended conditions and inhibitor present, typically stable for 12–24 months
• Note: Ensure containers are grounded when transferring to avoid static accumulation