Polyvinyl Butyral (PVB) is a versatile thermoplastic material produced from polyvinyl alcohol (PVOH). PVOH is manufactured from polyvinyl acetates through transesterification. Aqueous PVOH reacts with an aldehyde in the presence of small amounts of mineral acids to yield PVB, which precipitates out from the solution and is filtered, washed, and dried. The product PVB invariably contains a small percentage of residual hydroxyl ... Read more