Toppan Printing Co., Ltd.

Kazuya Yabusa

Masayuki Taniguchi

Takeo Kato

Tetsuo Aizawa

Akihiko Kobayashi

Toshibumi Imai

Tsutomu Shikakubo

Testuo Aizawa

Motoko Yoshikawa

A card having a paper as a base material laminated with decomposable plastic layers having such properties as durability, banding resistance, water resistance, chemical resistance, waterproofness, surface smoothness, glossiness end workability. Any visible information/design portion and/or a magnetic recording portion may be formed as required. The present invention improves the durability of a card using paper as a base material and provides the card which spontaneously decomposes even when left after being discarded.

Card

A biodegradable composite laminate for the manufacture of packaging containers is provided. The composite laminate includes a straight-chain, biodegradable 3-hydroxybutyric acid/3-hydroxyvaleric acid copolyester in a thin film which has been laminated on at least one surface of a sheet-like substrate. A polymeric blend of a poly-.epsilon.-caprolactone with the straight-chain copolyester may be employed in the place of the straight-chain copolyester alone. The method for the manufacture thereof is also provided.

Method for the manufacture of a composite laminate

A biodegradable composite laminate for the manufacture of packaging containers is provided. The composite laminate comprises a straight-chain, biodegradable 3-hydroxybutyric acid 3-hydroxyvaleric acid copolyester in a thin film which has been laminated on at least one surface of a sheet-like substrate. A polymeric blend of a poly-.epsilon.-caprolactone with the straight-chain copolyester may be employed in the place of the straight-chain copolyester alone. The method for the manufacture thereof is also provided.

Composite laminate

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Tokyo, Japan

Kazuya Yabusa