PERFORATED BIODEGRADABLE FILM AND BIODEGRADABLE STRAINER MADE THEREFROM

摘要

PROBLEM TO BE SOLVED: To obtain a perforated flexible biodegradable film having excellent air permeability and water permeability by using a biodegradable aliphatic polyester resin having a specified relationship between the shear rate and the viscosity and specifying the water permeability of the obtained film. SOLUTION: This film has the following properties: (i) it is made from a biodegradable polyester resin having K in the range: 0 ) of the molten resin; and C is a constant}, which is derived by expressing the relationship between the shear rate and the viscosity at 190 deg.C as a first-order approximation in the range of the shear rate of 40 to 100S<-1> , and (ii) the water permeability determined by a test using silicone oil having a viscosity of 100cSt is 0.25-1.5cm/sec.