Polyvinylbutyral

Polyvinyl butyral (PVB ) is a plastic, which is used mainly as a hot-melt adhesive in the form of intermediate films for laminated safety glass. So PVB is used among other things as an intermediate layer between the glass panels of windshields, as it is characterized by a splinter binding effect and high tensile strength.

Furthermore, PVB resins are used as binders, eg in printing inks, anticorrosive primers, plastic and wood coatings, packaging coatings and pigment preparations. They are also used as a temporary binder for ceramics because they combust completely at temperatures above 500 ° C.

PVB is made from polyvinyl alcohol by acetalization with butanal and belongs to the group of polyvinyl. This is for statistical reasons a maximum functionalization of about 80 % can be achieved. Since polyvinyl alcohol is prepared by hydrolysis of polyvinyl acetate, containing technical PVB still acetyl (at least about 2%). Polyvinylbutyrals low degree of acetalization are water-soluble, highly acetalated resins dissolve in alcohols. PVB resins with a higher proportion of the acetyl groups are soluble in aromatics. When used as an interlayer between sheets of glass not a complete functionalization is desirable because the free OH groups provide better bond to the glass.

Trade names of PVB: Butvar, Mowital, Pioloform

Trade names of PVB films: BUTACITE, SAFLEX, S- Lec, TROSIFOL