<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">polyvinyl acetal</topic></authority><related type="narrower"><topic>polyvinyl formal</topic></related><related type="broader"><topic>vinyl polymers</topic></related><variant type="other"><topic>acetal, polyvinyl</topic></variant> <note xml:lang="en"><![CDATA[ Any of a group of thermoplastic resins made by condensing polyvinyl alcohol with an aldehyde and used chiefly in the form of sheets and films, molded products, coatings, adhesives; especially, the resin made from acetaldehyde. ]]></note></mads>