Abstract: In relation to a core sheet for card for forming an environment-reactive layered card having a plant raw material plastic as a main raw material, a core sheet for card for forming a novel layered card having excellent heat resistance, impact resistance, as well as adhesiveness between each layer (heat fuse-bonding ability), is provided. A core sheet for card is proposed, which is a core sheet for card (A) to be used together with an over-sheet (B) provided with a structure in which at least one layer is a layer having as a main component resin an aromatic polyester series resin or a polycarbonate series resin or a mixed resin of these both for the purpose of forming a layered card, including one layer or two or more layers that are layered, among which at least one layer is a lactic acid series resin layer having a lactic acid series polymer as a main component resin.

Abstract: An aliphatic polyester film on which an inorganic gas-barrier film is formed by deposition to improve the gas barrier properties of the aliphatic polyester wherein the adhesion between the aliphatic polyester film and the deposited gas-barrier film has been improved. The aliphatic polyester film is biaxially stretched and comprises at least two layers (layers A and B). Each of the layers A and B contain an amorphous polylactic acid resin and a crystalline polylactic acid resin in a predetermined ratio.

Abstract: An aliphatic polyester film on which an inorganic gas-barrier film is formed by deposition to improve the gas barrier properties of the aliphatic polyester wherein the adhesion between the aliphatic polyester film and the deposited gas-barrier film has been improved. The aliphatic polyester film is biaxially stretched and comprises at least two layers (layers A and B). Each of the layers A and B contain an amorphous polylactic acid resin and a crystalline polylactic acid resin in a predetermined ratio.

Abstract: The present invention provides a biodegradable bag which can be heat-sealed at low temperature, does not develop corrugation, has transparency, and has degradability in the natural environment. Laminates including a biaxially oriented film of which the major component is a polylactic acid-family polymer, and a film of which the major component is an aliphatic polyester having a predetermined structure are heat-sealed so that the biaxially oriented film of which the major component is the polylactic acid-family polymer will be an outer layer.

Abstract: An object is to provide a biaxially stretched film which allows tacking, is heat-stickable, is less liable to unevenness in thickness, breakage, whitening, unevenness, etc. i.e. has stretching stability and is decomposable in the natural environment. It comprises a polylactic acid-family polymer as its major component, and has a storage elastic modulus E′ at 120° C. of 100-230 MPa as measured using a test method concerning temperature dependency of the dynamic viscous elasticity under JIS K7198.

Abstract: A film degradable in natural environment and high in both flexibility and transparency. A biodegradable film comprises a polymer of polylactic acid family and an aliphatic polyester other than polylactic acid in a weight ratio of from 70:30 to 20:80, said film having a tensile modulus of not more than 250 kg/mm2 and a light transmittance of not less than 65%.

Abstract: A biodegradable card comprising a laminated member having over-layers whose major component is a composition comprising 60-100 wt % of a polylactic acid and 40-0 wt % of a biodegradable aliphatic polyester having a glass transition temperature (Tg) of 0° C. or under on both sides of a core layer whose major component is a is composition comprising 40-90 wt % of a polylactic acid and 60-10 wt % of a biodegradable aliphatic polyester having a glass transition temperature (Tg) of 0° C. or under, characterized in that for the core layer and the over-layers, the crystallinities {(&Dgr;Hm-&Dgr;Hc))/&Dgr;Hm} converted from the melting calorie after crystallizing (&Dgr;Hm) of the polylactic acid portion when the temperature is raised, and the crystallizing calorie (&Dgr;Hc) of the polylactic acid portion generated due to crystallization during the temperature rise are 0.8 or over and 0.9 or over, respectively.

Abstract: A plastic film is provided in which brittleness has been improved, and which is not too soft, and which has practically satisfactory physical properties, heat-sealability stable with time, and biodegradability in natural environment. The film comprises a polylactic acid-family polymer and other aliphatic polyester at the ratio of 80:20 to 20:80, and the heat of fusion &Dgr;Hm1 converted to the polylactic acid-family polymer when the temperature of the film is raised is 35 J/g or under.