Polyvinyl butyrals

Polyvinyl butyrals (CAS 63148-65-2), commonly known as PVB, are thermoplastic resins produced by reacting polyvinyl alcohol with butyraldehyde.

Where is Polyvinyl butyrals used?

• Coatings, adhesives and laminating: commercially recognized under designations such as VL 023
• Automotive and architectural glazing: standard interlayer resin in laminated safety glass, bonding glass plies while absorbing impact energy
• Wash primers and metal primers: adhesion to bare metal surfaces outperforms many alternative binders
• Printing inks, particularly gravure and flexographic systems: binder resin
• Adhesive and sealant manufacturing: film-forming base in structural bonding for wood, leather and textile substrates
• It controls viscosity, pigment dispersion and adhesion to film substrates.

Commercial specifications

• Varying molecular weights and degrees of acetalization
• Grades differentiated by viscosity and hydroxyl content