Cellulose acetate butyrate

Cellulose acetate butyrate (CAS 9004-36-8), commonly known as CAB, is a mixed cellulose ester produced by reacting cellulose with acetic and butyric acids.

Where is Cellulose acetate butyrate used?

• Coatings, plastics and printing: film-forming binder and rheology modifier
• Industrial and automotive coatings: controls metallic flake orientation and prevents pigment settling, improving finish consistency
• Transparent and tinted plastic parts: low haze and UV stability
• Printing inks: adhesion, gloss and controlled viscosity in solvent-based formulations
• Adhesives and sealants: modifier that adjusts tack and film flexibility without compromising bond strength
• It offers lower moisture absorption than standard cellulose acetate.
• Used in films.
• High-hydroxyl grades are useful in curing finishes such as baking enamels and acid-catalyzed coatings.
• In blends with PVC, PMMA or cellulose acetate, it increases impact resistance and surface properties.
• Used in cosmetic packaging such as nail polish bottles and personal care containers due to its clarity and chemical resistance.

Good to know: Compared to standard cellulose acetate, CAB offers lower moisture absorption. Food-contact compliance varies by specific grade and regional regulation.

Formulation notes

• Inherently hydrophobic and insoluble in water, so it cannot be used directly in water-based systems in its raw form.

Typical specification

• Offered in a wide range of grades with different butyrate/acetate ratios and viscosities.

Frequently asked questions about Cellulose acetate butyrate

What effect does high acetate content have on film properties?

A high acetate content gives harder films and faster drying.

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