| 摘要 |
PURPOSE:To simply and profitably obtain the subject material having a sufficient strength, a sufficient water-permeating property, and an enough decomposing property even under natural environments, and useful as an agricultural mulching sheet, etc., by coating a dispersion liquid of a specified decomposable polymer on a base material followed by heat treatment. CONSTITUTION:This material is obtained by coating a dispersion liquid containing (A) a decomposable polymer consisting mainly of (i) polylactic acid or (ii) the copolymer of lactic acid with (iii) a hydroxycarboxylic acid as essential components on a base material (B) containing cellulose fibers, and subsequently subjecting the coated base material to a thermal treatment. The component (ii) is preferably D-lactic acid, L-lactic acid or their mixture, and the component (iii) is preferably glycolic acid or 6-hydroxycaproic acid. The weight- average mol. wt. of the component A is preferably <=50000. |
