公开(公告)号：US11008457B2

公开(公告)日：2021-05-18

申请号：US16303487

申请日：2017-05-26

申请人： NATIONAL INSTITUTE FOR MATERIALS SCIENCE

发明人： Masanobu Naito ,  Joginder Bansal ,  Debabrata Payra

IPC分类号： C08L75/04 ,  C08G18/10 ,  C08G18/32 ,  C08G18/42 ,  C08G18/64 ,  C08G18/73 ,  C08J5/18 ,  C08J7/12 ,  C08L99/00

摘要： A self-supporting multifunctional film is provided based on natural poly-phenols such as tannic acid. The self-supporting film composition of the invention contains a tannic acid derivative in which 12% to 24% of hydroxyl groups in tannic acid are bonded via urethane bonds that are formed by way of reactions with cyanate groups. Preferably, the film composition further includes a precursor polymer and 45 to 65% by mass of tannic acid and 55 to 35% by mass of the precursor polymer. Preferably, the precursor polymer has a second linear hydrocarbon compound urethane-bonded to both ends of a first linear hydrocarbon compound, and more preferably a diisocyanate group having an oligoethyene glycol as a spacer. Preferably, the ratio of the urethane bonds contained in the precursor polymer to the hydroxyl groups contained in the tannic acid is (12:88) to (24:76) inclusive in terms of molar ratio.