4-tert-butylbenzoic acid

4-tert-Butylbenzoic acid (CAS 98-73-7), also known as PTBBA or TBBA, is an aromatic carboxylic acid used as a modifier, stabilizer and catalyst component in coatings, polymer and personal care manufacturing.

Where is 4-tert-butylbenzoic acid used?

• Alkyd and polyester resins: chain-stopper
• Polypropylene and thermoplastics: nucleating agent modifier and stabilizer influencing crystallization behaviour and clarity
• Personal care: UV stabilizer and antioxidant component in sunscreen bases and protective cosmetics
• In Ziegler-Natta and related polyolefin catalyst systems it acts as a ligand precursor.
• Thermal stabilizer in PVC.
• Polymerization inhibitor for polyesters.
• Intermediate in the synthesis of chemical substances.

Formulation notes

• Incompatible with strong oxidizing agents.

Typical specification

• Offered as a white to almost white powder to crystal.
• A fertility study via diet in rat can be obtained from BG RCI for REACH registration.

Regulatory status

• Legally classified as Repr. 1B under CLP.
• Classified as CMR Category 1A/1B, so the registration deadline for annual manufacture or import of 1 tonne or more is 31 December 2026.
• Suppliers must ensure that the packaging or mixtures containing it bears the statement 'Reserved for professional users only' visibly, legibly and indelibly before placing on the market.

Storage, packaging and handling

• Should be stored in a tightly closed container in a dry and well-ventilated place.
• Assigned storage class 8A (combustible, corrosive hazardous materials) under TRGS 510.

Frequently asked questions about 4-tert-butylbenzoic acid

What is the EC code of 4-tert-butylbenzoic acid?

The EC code of 4-tert-butylbenzoic acid is 202-696-3.

Technical content is compiled and updated by the SoleChem product team from public technical sources; the certificate of analysis (COA) governs product-specific specifications.