An aspect of the present invention relates to an acid-modified polyester-based resin in which an ,-unsaturated carboxylic acid and/or an anhydride thereof (X) is grafted to an aliphatic-aromatic polyester-based resin containing an aliphatic diol unit, an aliphatic dicarboxylic acid unit, an aromatic dicarboxylic acid unit, the acid-modified polyester-based resin has a melt flow rate (210 C., load: 2160 g) of 1.4 g/10 min to 15 g/10 min, and a content of the ,-unsaturated carboxylic acid and/or an anhydride thereof (X) is 0.0001 to 0.8 parts by mass with respect to 100 parts by mass of the aliphatic-aromatic polyester-based resin.

An aspect of the present invention relates to an acid-modified polyester-based resin in which an ,-unsaturated carboxylic acid and/or an anhydride thereof (X) is grafted to an aliphatic-aromatic polyester-based resin containing an aliphatic diol unit, an aliphatic dicarboxylic acid unit, an aromatic dicarboxylic acid unit, the acid-modified polyester-based resin has a melt flow rate (210 C., load: 2160 g) of 1.4 g/10 min to 15 g/10 min, and a content of the ,-unsaturated carboxylic acid and/or an anhydride thereof (X) is 0.0001 to 0.8 parts by mass with respect to 100 parts by mass of the aliphatic-aromatic polyester-based resin.

Disclosed is a biaxially oriented polyester film that is excellent in adhesiveness with a metal layer etc., and excellent in deep drawability for an isotropic shape, such as a square shape. A biaxially oriented polyester film having at least a base layer and an adhesive layer each of which contains a polyester as a main component, the film satisfying the following requirements (1) to (3): (1) a difference between reversible heat capacity difference (Cp) at around glass transition temperatures of the adhesive layer and the base layer is not smaller than 0.10 and not larger than 0.45; (2) a molecular orientation ratio measured by using a molecular orientation meter is higher than 1.2; and (3) a stress at 10% elongation (F10) in each of a machine and transverse direction is not lower than 90 MPa and not higher than 160 MPa.

Disclosed is a biaxially oriented polyester film that is excellent in adhesiveness with a metal layer etc., and excellent in deep drawability for an isotropic shape, such as a square shape. A biaxially oriented polyester film having at least a base layer and an adhesive layer each of which contains a polyester as a main component, the film satisfying the following requirements (1) to (3): (1) a difference between reversible heat capacity difference (Cp) at around glass transition temperatures of the adhesive layer and the base layer is not smaller than 0.10 and not larger than 0.45; (2) a molecular orientation ratio measured by using a molecular orientation meter is higher than 1.2; and (3) a stress at 10% elongation (F10) in each of a machine and transverse direction is not lower than 90 MPa and not higher than 160 MPa.

The present invention provides a heat shrinkable multilayer film which has excellent adhesiveness between front and back layers and an interlayer not only at normal temperature but also at low temperature to effectively prevent delamination and is less likely to have residual white streaks along creases. The present invention also provides a heat shrinkable label including the heat shrinkable multilayer film. The present invention relates to a heat shrinkable multilayer film including: front and back layers each containing a polyester resin; an interlayer containing a polystyrene resin; and adhesive layers, the front and back layers and the interlayer being stacked with the adhesive layers interposed therebetween, the adhesive layers each containing 20 to 65% by weight of a polystyrene resin and 35 to 80% by weight of a polyester elastomer.

A multi-layer sheet suitable as sealable or peelable sheet specially used for closing foodstuff containers. This multi-layer sheet comprises a polymeric substrate layer and a seal or a peel-seal layer. The multilayer composite film has at least two main component layers, namely in order, a polymeric substrate layer for mechanical strength and a heat-sealable layer applied by extrusion-coating, comprising a polyester of at least one aromatic dicarboxylic acid and at least one aliphatic dicarboxylic acid and at least one aliphatic diol. The polyester substrate layer comprises a crystallizable polyester base layer and an amorphous polyester sealable skin layer. The heat-sealable layer is slow-crystallizing with a glass transition temperature 50 F. or lower and melting point 250-320 F.

A multi-layer sheet suitable as sealable or peelable sheet specially used for closing foodstuff containers. This multi-layer sheet comprises a polymeric substrate layer and a seal or a peel-seal layer. The multilayer composite film has at least two main component layers, namely in order, a polymeric substrate layer for mechanical strength and a heat-sealable layer applied by extrusion-coating, comprising a polyester of at least one aromatic dicarboxylic acid and at least one aliphatic dicarboxylic acid and at least one aliphatic diol. The polyester substrate layer comprises a crystallizable polyester base layer and an amorphous polyester sealable skin layer. The heat-sealable layer is slow-crystallizing with a glass transition temperature 50 F. or lower and melting point 250-320 F.

A method may produce a biodegradable laminate, including: laminating an aliphatic polyester-based resin layer and a polyvinyl alcohol-based resin layer with a bonding layer between the aliphatic polyester-based resin layer and the polyvinyl alcohol-based resin layer. The biodegradable laminate may include: the aliphatic polyester-based resin layer comprising an aliphatic polyester-based resin composition; the bonding layer comprising an adhesive resin; and the polyvinyl alcohol-based resin layer comprising a polyvinyl alcohol-based resin. The aliphatic polyester-based resin composition may include an aliphatic polyester-based resin, a polyhydroxyalkanoate including a 3-hydroxybutyrate unit as a main constituent unit, and an inorganic filler. The aliphatic polyester-based resin may include, in polymerized form, an aliphatic diol and an aliphatic dicarboxylic acid, as main constituent units, and a trifunctional or higher-functional aliphatic polyol, a trifunctional or higher-functional aliphatic polyvalent carboxylic acid, an acid anhydride thereof, or a trifunctional or higher-functional aliphatic polyvalent oxycarboxylic acid component.

An adhesive film for a polishing pad including a plurality of through holes extended from a top surface to a bottom surface of the adhesive film, wherein a volume fraction of the plurality of through holes is 3% to 20% based on a total volume of the adhesive film, is disclosed.

An adhesive film for a polishing pad including a plurality of through holes extended from a top surface to a bottom surface of the adhesive film, wherein a volume fraction of the plurality of through holes is 3% to 20% based on a total volume of the adhesive film, is disclosed.