CONTROL OF DEGRADABILITY OF POLYLACTIC ACID-BASED RESIN, DEGRADABLE FILM/SHEET AND FORMED MATERIAL FROM THE FILM/SHEET

摘要

PROBLEM TO BE SOLVED: To obtain the subject polymer capable of effectively forming an initial degradation thereof e.g. a crack and as a result accelerating a hydrolysis by water so as to enhance the degradability of the polymer by blending a specific amount of an inorganic particles. ;SOLUTION: This method for controlling the degradability of a polylactic acid-based polymer is to blend (A) 100 pts.wt. polylactic acid-based polymer (e.g.; a polymer having 50,000-100,000 weight averaged molecular weight and containing ≥94% lactic acid unit, with (B) 1-120 pt.wt. inorganic particles (e.g.; silica, titania, talc, alumina, a clay, calcium carbonate, magnesium carbonate and a glass powder, and having a large specific surface area) for enhancing the degradability of the component A. Further, the blending of the components A and B can be performed simultaneously with the formation, but it is more preferable to be performed by melt extruding the sufficiently dried components A and B by separate extruders for peletization before the formation.;COPYRIGHT: (C)1998,JPO