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Title:
CONTROL OF DEGRADABILITY OF POLYLACTIC ACID-BASED RESIN, DEGRADABLE FILM/SHEET AND FORMED MATERIAL FROM THE FILM/SHEET
Document Type and Number:
Japanese Patent JP3490241
Kind Code:
B2
Abstract:

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.


Inventors:
Terada, Shigenori
Takagi, Jun
Application Number:
JP4286297A
Publication Date:
January 26, 2004
Filing Date:
February 13, 1997
Export Citation:
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Assignee:
MITSUBISHI PLASTICS IND LTD
International Classes:
C08J5/18; B29D7/01; C08K3/00; C08L67/04; C08L101/16; (IPC1-7): C08L67/04
Attorney, Agent or Firm:
長谷川 一 (外1名)