Polyvinyl butyral

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Polyvinyl butyral (or PVB) is a resin usually used for applications that require strong binding, optical clarity, adhesion to many surfaces, toughness and flexibility. It is prepared from polyvinyl alcohol by reaction with butanal. The major application is laminated safety glass for automobile windshields. Tradenames for PVB-films are: BUTACITE, SAFLEX, S-Lec, TROSIFOL

Translated from http://de.wikipedia.org/wiki/Polyvinylbutyral