Toray Industries, Inc.

Nanotheta Co., Ltd.

Koji Okabayashi

Shinji Takeoka

Kazuhiro Tanahashi

Akihiro Saito

Toru Arakane

Toshinori Fujie

Atsushi Murata

Motonori Hochi

Megumi Nakanishi

Shinya Ohtsubo

Ai Suzuki

Shoichiro Suzuki

Shinya Otsubo

Yuya Ishiduka

A material for adhesion prevention can be adhered to biological tissue with certainty and has improved tissue adhesiveness and biodegradability. Such material for adhesion prevention is composed of: a 1- to 1,000-&#x3bc;m-thick water-soluble support layer comprising a water-soluble polymer; and a 1- to 1,000-&#x3bc;m-thick adhesion prevention layer comprising a biodegradable polymer. The biodegradable polymer has a structure in which a branched polyalkylene glycol comprising 3 to 8 terminal hydroxyl groups per molecule is bound to a polyhydroxy alkanoic acid, and a mass ratio of the branched polyalkylene glycol relative to the total mass is 1% to 30%.

Material for adhesion prevention

A polymer film can be adjusted to movement or a fine uneven surface of a living body and has excellent ability to adhere to a biological tissue. The polymer film includes a block copolymer having a structure in which branched polyalkylene glycol and polyhydroxyalkanoic acid are bound to each other, wherein the polymer film has a film thickness of 10 to 1000 nm. The branched polyalkylene glycol has at least three terminal hydroxyl groups per molecule, the mass percentage of the branched polyalkylene glycol relative to the total mass of the block copolymer is 1% to 30%, and a value obtained by dividing the average molecular weight of polyhydroxyalkanoic acid in the block copolymer by X that is the number of terminal hydroxyl groups present per a single molecule of the branched polyalkylene glycol is 10000 to 30000.

Polymer film and antiadhesive material using the same

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Tokyo, Japan

Koji Okabayashi