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PROBLEM TO BE SOLVED: To enhance safety to the human body, and sufficiently prevent yellowing by using polyethylene glycol of the specific concentration as an impregnating liquid impregnated into a base material sheet including pulp. SOLUTION: Polyethylene glycol PEG is contained in an aqueous mediu...

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Bibliographische Detailangaben
1. Verfasser: YOKOYAMA MACHIKO
Format: Patent
Sprache:eng
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