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polyvinyl acetal

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noun Chemistry.
  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.
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Origin of polyvinyl acetal

First recorded in 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018