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AssigneeSekisui Plastics Co., Ltd.
InventorsTakaaki Hirai, Katsunori Nishijima, Tetsuya Ochiai
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The present invention provides a method for producing polylactic acid-based resin foamed particles for in-mold foam-molding from which a polylactic acid-based resin foam-molded article excellent in heat resistance and mechanical strength can be obtained by in-mold foam-molding. In the method of the present invention for producing polylactic acid-based resin foamed particles for in-mold foam-molding, a rotary blade is rotated at a given rotation speed while being always in contact with the front end surface of a nozzle and a polylactic acid-based resin extrudate extrusion-foamed through a nozzle is cut with the rotary blade, so that it is possible to cut the polylactic acid-based resin extrudate surely to obtain substantially spherical polylactic acid-based resin foamed particles. Therefore, when polylactic acid-based resin foamed particles are used for in-mold foam-molding, the polylactic acid-based resin foamed particles foam uniformly in all directions and, as a result, the foamed particles are thermal fusin bonded to unite together strongly in all direction.
A polylactic acid-based resin foamed particle for in-mold foam-molding which is a polylactic acid-based resin foamed particle obtained by extrusion-foaming, wherein the polylactic acid-based resin contains both optical isomers, a D-form and an L-form, as constituent monomer components, and the content of one of the optical isomers, the D-form or the L-form, whichever is less, being less than 5 mol %, or contains only one of optical isomers, a D-form or an L-form, as a constituent monomer component, and wherein the surface of the particle is entirely covered with a skin layer, and the crystallinity degree is 30% or less.
Dependencies are inferred from the claim text.