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publicationNumber US-4083906-A
titleOfInvention Process for the manufacture of open-pore shaped articles of polyvinyl alcohol-acetal sponge
abstract Starch products which were hitherto used as pore-forming substances in the manufacture of polyvinyl alcohol acetal sponges are replaced by polyethylene glycol or polyacrylamide. This results in a more uniform distribution of pore size, lower shrinkage of the sponge material during the acetalization, and easier washing of the sponge after the acetalization.
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