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Polyvinyl butyral

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Tab PVB Spez-E

1Solution Viscosity was determined in 5% by weight in 95% ethanol, at 20°C, using Brookfield viscometer.
2Solution Viscosity was determined in 10% by weight in toluene/ethanol 1/1, at 20°C, using Brookfield viscometer.

PVB is manufactured by the condensation reaction of PVA and n-butyraldehyde.

Physical properties:

  • Appearance                              white granule or powder
  • Specifc gravity                          1,1 g/cm3
  • Bulk density                             0,25 - 0,35 g/cm3 (powder), 0,4 – 0,5 g/cm3 (granule)
  • Glass transition temperature      50 - 95°C
  • Melting range                           160 - 210°C

Field of application:

Wash primer
The best-known PVB resin application for metal paints is "wash primer". It is widely used on a variety of metal surfaces, such as storage tank, ship, airplane, bridge, dam lock, electronic appliances etc. Wash primer is more effective than other corrosion inhibiting materials. They offer several means of corrosion prevention in a sin­gle treatment. These anticorrosive primers adhere better and dry faster than conventional materials, and they are easy to be applied. The good anchoring of the wash primer to metal is brought by a synthetic resin/ pigment/ phosphoric acid/ metal complex. Both B05HX and B08MX are suitable for this application. High solid content, low viscosity solutions can be produced with B05HX. B08MX, on the other hand, has a higher degree of poly­merization than B05HX. Hence, solution viscosity of B08MX is higher than that of B05HX. These films have low water absorption and good weather resistance.

Foil Coatings
To coat a metal foil (e.g. aluminum, brass, tin, lead, iron) with PVB solution, the foil strength and moisture-proofness is increased, and so its printability. The adhesion of the coating can be improved by stoving it at temperature up to about 140°C. B05HX and B08MX can be used for foil coating.

Wood Paints
PVB is widely used as a component of wood sealers and finishes. It confers toughness, flexibility, impact resis­tance to the film and enables the coating to maintain adhesion under a wide variety of conditions. Combinations of PVB with phenolic resins, shellac and nitrocellulose are used commonly for wood coatings. Knot sealer is a barrier to bleeding of terpenaceous matter from knots, heart wood and rosin ducts. The system consists of a com­bination of PVB and phenolic resin. B05HX and B08MX can be used in this application.

Leather Paints
PVB in combination with nitrocellulose and plasticizer have been used in paint for leather. This paint has excellent adhesion, elongation, and crack-prevention properties. B08SY, B06SY and B05SY can be used in leather paints.

Stoving Paints
Combination of PVB with hardening resins like phenolic, melamine and urea resin are suitable for stoving paints. A stoved film of phenolic resin without PVB is brittle and has poor leveling, but by adding 5-25% of PVB to the phenolic resin solid, the coating film will perform good flexibility, good leveling, free from pinholes, and good alkali resistance. B05HX and B03HX series can be used for this application.

Powdery Paints
For powdery paints, PVB is blended with epoxy resins. It is effective in edge covering and in preventing from pul­verization. B05HX and B03HX can be used for powdery paints.

Adhesives
A mixture of PVB and phenolic resin may be used for bonding metal, glass, leather, wood, cloth, paper and other materials. After the solvent has been completely removed at room temperature or at a low bake, the surfaces are heated and pressed together. The curing time and temperature will depend on the material being bonded. For most applications, a treatment of 160°C for 15 to 30 minutes is suitable. B05HX, B08MX and B17HX are suitable to use according to the bonded materials and operation conditions.

Printed-Circuit Board Adhesives
The most important properties of printed-circuit board adhesives are peel strength, blister resistance and dielec­tric properties and a mixture of PVB and phenolic resin can just be a good adhesive for this application. They are used in joining the prepregs of phenolic laminate with copper foil. B10TX, B11TX and B12TX (or granular type PVB) are used for this application.

Printing Inks
PVB is used in manufacturing ink for gravure, letterpress and flexorgraphic printing. PVB offers good flexibility, adhesion and toughness. B03HX, B05HX, and B08MX can be used in printing inks.

Hot-melt Adhesives
By fusing PVB with plasticizer and fluxing-extending resins, hot-melt adhesives providing a tough, clear film with good adhesive strength can be produced. B05HX can be used for hot-melt adhesives.

Ceramic Binders
In the development of ceramic electronic component, PVB is used as the binder to give green strength to the ceramic powder. B05HX, B08MX, B08SY and B05SY can be used for this application.

Transfer Paper for Textile
B08MX, B05HX and B03HX can be used to make the printing ink of transfer paper for textile.

Textile Coating, Printings and Yarn Sizing Agents
B05HX, B08MX and B17HX can be used for textile coatings, textile printings and textile yarn sizing agents.

Tab PVB Loes-E
S = soluble
PS = partially soluble
U = insoluble