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| - As a basis for the foamed, water-soluble polymer layer, both synthetic, water-soluble polymers such as polyvinyl alcohols, poly(alkyl allyl ethers), polyglycol ethers, polyvinylpyrrolidones, polyacrylates, polymethacrylates as well as derivatives and copolymers thereof, and natural, water-soluble polymers such as guar, alginates, agar-agar, xanthan, pectin, starch or the like, as well as chemicall
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