Polyvinyl Butyral, Polyvinyl Acetal, Recycled PVB, PVB Resin, PVB, 63148-65-2

Polyvinyl Butyral, Polyvinyl Acetal, Recycled PVB, PVB Resin, PVB, 63148-65-2

POLYVINYL BUTYRAL (PVB)

Product Description:
Polyvinyl Butyral (PVB) is a thermoplastic resin obtained by the acetalization of polyvinyl alcohol (PVA) with butyraldehyde. It offers high adhesion to glass and metal surfaces, exceptional impact resistance, optical clarity, and flexibility. It is a copolymer consisting predominantly of vinyl butyral units, with specific proportions of vinyl alcohol and vinyl acetate residues.

Chemical Family / Synonyms:
Polyvinyl Butyral, Poly(vinyl butyral), PVB Resin, Polyvinyl acetal
CAS Number: 63148-65-2

GRADE 1: LAMINATED GLASS INTERLAYER (FILM) GRADE

This grade is specifically designed for use as an interlayer film in automotive and architectural safety glass.

Application Areas:

• Automotive windshields and side windows

• Architectural safety glass

• Acoustic laminated glass

• UV-filtering glass

Performance Criteria:

• High impact absorption and fragment retention upon breakage

• Excellent optical transparency (%T) and low haze

• High glass surface adhesion (Peel test)

• Resistance to yellowing (Yellowness Index - YI)

• Good acoustic damping (dependent on plasticizer formulation)

• High uniformity in thickness tolerance

GRADE 2: ADHESIVE AND COATING BINDER (POWDER/GRANULE) GRADE

This grade is suitable for printing inks, primers, and various industrial adhesives requiring high adhesion strength and solubility.

Application Areas:

• Adhesive resin for ceramic, metal, and textile surfaces

• Flexible packaging and printing inks

• Metal primers and anti-corrosive coatings

• Wood coating and varnish binder

• Electrical insulating varnishes

• Ceramic transfer printing and screen printing inks

GENERAL PROCESSING AND STORAGE INFORMATION

Solution Preparation (For Grade 2):
Powder or granular resin should be added slowly to a suitable, controlled solvent blend (e.g., MEK/EtOAc/IPA) under agitation. Sufficient time must be allowed for complete swelling and dissolution to prevent lump formation. Traces of water should be minimized.

Film Processing (For Grade 1):

• Extrusion/Calendering: Processing range of 160 – 200 °C; moisture and solvent control is critical.

• Plasticizer: Typically formulated with 20-40% plasticizer for target film performance.

• Lamination: Glass-interlayer-glass bonding is typically performed in an autoclave at 10-14 bar pressure and 120-140 °C, including pre-heating and vacuum stages.

Adhesive Formulation (For Grade 2):
Can be optionally modified with suitable plasticizers and crosslinkers, such as epoxy or isocyanate-based agents.

Storage Conditions and Shelf Life:

• Conditions: Must be stored in a cool, dry place, away from direct sunlight and moisture, in the original sealed packaging.

• Shelf Life: Typically 12 to 24 months when stored under recommended conditions, depending on the manufacturer.

Safety and Regulatory:

• Ensure adequate ventilation and use appropriate Personal Protective Equipment (PPE) when handling the powder form.

• VOC regulations must be observed for solvent-based systems.

• The suitability of the final product for its intended use (automotive, architectural) must be verified against relevant local optical, impact, and safety standards.

Disclaimer: The information in this document is general in nature and based on typical properties. It does not constitute a specification or a guarantee. Users must evaluate the product's suitability for their specific application through their own testing.

1. PVB Alternatives and Other Names

While PVB is the standard for laminated glass and high-performance adhesives, the following alternatives may be considered depending on the application. However, none of them alone offers the same cost-performance balance in adhesion, optics, and impact resistance.

Other Names and Synonyms for PVB:

• Polyvinyl Butyral

• Polyvinyl acetal

• Butvar (common laboratory and industrial synonym)

• Poly(vinyl butyral)

2. Sample Formulations

Below are starting formulations for two different applications, prepared with both virgin PVB and recycled PVB (rPVB) . By using rPVB, your formulation cost will decrease significantly.

Formula A: Screen Printing Ink (for Glass/Ceramic)

This formula is designed for applications requiring high adhesion and chemical resistance.

Preparation: Slowly dissolve the rPVB powder in the alcohol/ester blend. After complete dissolution, add the plasticizer and pigment, then disperse.

Formula B: Metal Primer (Anti-Corrosive)

For metal surfaces requiring high adhesion and flexibility.

Preparation: Dissolve rPVB in the MEK/IPA blend. Once fully dissolved, disperse the pigment and fillers using a high-speed mixer. Add the epoxy component just before application.

3. Recycled PVB (rPVB) and the Betakim Advantage

PVB recovered from laminated glass edge trim or end-of-life windshields is mechanically and chemically processed into high-quality Recycled PVB (rPVB) granules or powder. Sourcing this product from Betakim offers significant advantages over virgin resin.

Why is rPVB from Betakim More Profitable and Advantageous?

• Cost Advantage: The price of rPVB is 20% to 40% lower than virgin PVB resin. For high-volume production, this translates to a substantial annual profit increase.

• Sustainability and Brand Value: Recovering waste material reduces your carbon footprint and waste disposal costs. This environmentally friendly approach enhances brand value, especially in export markets and with corporate clients.

• High and Consistent Quality: rPVB from Betakim undergoes a controlled recycling process. Critical parameters like particle size, moisture content, and viscosity are consistent, ensuring no surprises in your production.

• Reduced Equipment Wear: Processed and cleaned rPVB may contain fewer volatile substances and gel particles than some virgin resins. This reduces screen clogging in printing machines and extends equipment life.

Application Areas:

Recycled PVB can be used in virtually any pigmented application where optical clarity is not critical, replacing virgin PVB:

• Printing Inks: As the main binder in screen, flexo, and gravure inks.

• Adhesives: For metal, wood, textile, and especially ceramic bonding.

• Primers: In anti-corrosive paints and metal pre-treatment coatings.

• Powder Coatings: As a flow modifier and binder additive.

• Re-Laminated Glass: Under suitable conditions, it can be reprocessed into interlayer film (Betakim may have specific grades for this).

How to Use rPVB:

The usage procedure is virtually identical to virgin PVB, meaning you can make the switch without altering your existing production line.

1. Solution Preparation:

   • In a suitable mixer, first prepare your solvent blend (e.g., Ethyl Acetate + IPA).

   • Slowly add the rPVB powder/granules with continuous stirring. This step is critical to prevent lump formation. Do not dump it in all at once.

   • Continue stirring for 2-4 hours for complete dissolution.

2. Important Points:

   • Moisture Control: Protect the product from moisture after opening the packaging. Moisture causes haze and film defects.

   • Viscosity Adjustment: There may be very slight viscosity variations between rPVB batches. This is easily adjusted by modifying the solvent ratio in your formulation and does not create a production issue.

   • Filtration: For the highest quality, filtering the prepared solution through a fine filter (e.g., 10-20 microns) before use will trap any potential particles, thereby improving print or coating quality.

Conclusion: Recycled PVB from Betakim is the smartest way to reduce your costs without compromising product performance, fulfill your environmental responsibilities, and stand out from the competition. We recommend contacting Betakim to obtain detailed samples and a price quotation.