Alkylbenzyl Phthalate
Other Names: Benzyl alkyl phthalates; Mixed C7–C9-alkyl benzyl phthalate esters
CAS Number: 68515-40-2
Molecular Formula: C₆H₅CH₂COO–R (where R represents branched C7–C9 alkyl groups)
Molar Mass: Approx. 340–400 g/mol (mixture-dependent)
Appearance: Clear, oily liquid
Odor: Mild, ester-like

Alkylbenzyl phthalate (CAS 68515-40-2) is a phthalate ester mixture composed of benzyl and C7–C9 alkyl side chains. It is primarily used as a plasticizer to enhance flexibility and softness in polymers, especially PVC-based materials.

Chemical and Physical Properties
Density: ~1.05–1.12 g/cm³
Boiling Point: >300 °C (decomposes)
Melting Point: Liquid at room temperature
Solubility in Water: Practically insoluble
Solubility in Organic Solvents: Soluble in alcohols, esters, ketones, and hydrocarbons
Flash Point: >200 °C (closed cup)
Vapor Pressure: Very low at ambient temperature

Applications
Plasticizer in Polymers:

• Widely used in the production of flexible PVC for cables, hoses, flooring, and synthetic leather

• Suitable for applications requiring medium permanence and low volatility

Industrial Uses:

• Component in sealants, adhesives, and inks

• Used in manufacturing of coated fabrics and conveyor belts

Safety

Signal Word: Warning

GHS Hazard Statements:

• H361: Suspected of damaging fertility or the unborn child

• H400: Very toxic to aquatic life

• H410: Very toxic to aquatic life with long-lasting effects

Precautionary Statements:

• P273: Avoid release to the environment

• P280: Wear protective gloves, protective clothing, and eye protection

• P308+P313: If exposed or concerned: Get medical advice/attention

• P391: Collect spillage

• P501: Dispose of contents/container in accordance with local/regional regulations

Handling and Storage
Store in a tightly sealed container in a cool, dry, and well-ventilated area. Protect from direct sunlight and sources of ignition. Prevent environmental release. Use appropriate personal protective equipment when handling.