METHOD FOR PRODUCING POLYVINYL ACETAL RESIN
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United States of America Patent
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Issued Date -
Feb 5, 2009
app pub date -
Aug 7, 2006
filing date -
Aug 9, 2005
priority date (Note) -
Abandoned
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Abstract
A method for producing a polyvinyl acetal resin is provided which is characterized in that a polyvinyl alcohol and a carbonyl compound are reacted at 40 to 200° C. in a liquid containing water and/or an alcohol as solvents in the presence of an acid catalyst including carbon dioxide. By this method, a polyvinyl acetal resin having a halogen element content of ppm or less and an alkali metal element content of 1000 ppm or less can be obtained without particularly performing washing operations. Therefore, a method for producing a polyvinyl acetal resin containing only little impurities such as metal salts and acids is provided.
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