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Chemical Properties of PVB resins
Polyvinyl Butyral Resins (Briefly known as PVB resin) is produced from the condensation reaction of PVA (Polyvinyl Acetate) and nButyl aldehyde, which is a thermoplastic resin. Due to its unique chemical structure, it contains three major functional groups: - Butyral group
- Hydroxyl groups and
- Acetyl groups
These three functional groups make PVB resins contain several very distinguishing properties listed as follows:
| Functional group & molecular weight |
Special Properties of Functional groups |
| Butyral group |
Good flexibilityGood compatibility with base resinBetter water resistanceSoluble in non- polarized solvent |
Acetyl group
(the residual acetate group) |
Higher Tg valueSolution viscosity |
Hydroxyl group
(OH group) |
Better adhesionHigher reactivity with thermosetting resin |
| Degree of Polymerization |
Increase film toughnessEasy control on softening pointControl on adhesionControl on solution viscosity |
Based on above unique properties, PVB can be widely used in a variety of applications as follows:
| Chemicals Properties |
Applications |
| Strong adhesion (to glass, metal, wood, plastics, leather, ceramics) |
a. Coating on glass, metal, wood, leather, plastics
b. Adhesion enhancer for above substrates |
| PVB is excellent film form with high toughness and flexibility |
a. Lamination/adhesion for safety glass
b. Protective coating primer |
| Odorless and nontoxic |
a. Widely used in skin contact products
b. Food contact products and inks |
| Mechanical properties can be modified by degree of polymerization |
Easy to control to meet the applications need, so can be widely used in various industries |
| Can crosslink with many resins like Phenolic, epoxy, urethane, urea and melamine resin, etc. |
Ease of application in many resin compounding systems |
| Can blend with nitrocellulose and ketone resin to increase its hardness |
Can be used in wood and leather applications |
| Good film properties also can be adjust by plasticizers |
Can be used in various coating and lamination applications |
| Compatible to most of the major plasticizers |
Can be widely used in plastics field |
Above properties enable PVB resins to be used in various applications like automotive, marine, industrial, military, electronics, construction, printing and adhesives industries.
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