| 摘要 |
PROBLEM TO BE SOLVED: To obtain a biodegradable laminated sheet capable of being readily degraded by microorganisms, having an arbitrary controllable degrading rate thereof, and excellent in texture, strength and flexibility. SOLUTION: This biodegradable laminated sheet consists of a meltblown nonwoven fabric and spunbonded nonwoven fabrics, and has a three layer structure having the spunbonded nonwoven fabrics laminated on both sides of the meltblown nonwoven fabric and thermally fused to adhere to each other. The meltblown nonwoven fabric is composed of an aliphatic polyester resin having biodegradability, and has a fiber diameter within the range of 0.5-2.0 μm. The proportion of the weight of the meltblown nonwoven fabric based on the laminated sheet is within the range of 10-30 wt.%, and the spunbonded nonwoven fabric consists of continuous filaments composed of a polybutylene succinate synthesized from 1,4-buthane diol and succinic acid, and formed into the high molecular one by an urethane bond. The density of the spunbonded nonwoven fabric measured based on JIS L 1906 (calculated from the thickness under 2 kPa load) is within the range of 0.15-0.25 g/cc. |
