Meaning of polyvinyl acetal

pol'yvi'nyl ac'etal

Pronunciation: [key]
— Chem. Chem.
  1. any of the class of thermoplastic resins derived by the condensation of an aldehyde with polyvinyl alcohol.
  2. the slightly yellow, water-insoluble resin produced from partially hydrolyzed polyvinyl acetate and formaldehyde: used chiefly in the manufacture of lacquers, photographic film, and adhesives.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.