| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a workpiece excellent in utility such as durability and applicability whose part comprising a polylactic acid based resin composition is easily decomposed and/or disintegrated when used in contact with an alkaline environment such as in concrete and which is furthermore easily removed from a frame when used in a sheet form in the application to the surface of the frame for placing concrete, such utility having been impossible by the prior art. <P>SOLUTION: The resin workpiece is used in the state in contact with an alkaline environment and at least part of the resin workpiece comprises a polylactic acid based resin composition and the polylactic acid based resin composition comprises 5 wt.% to less than 50 wt.% plasticizer, and the plasticizer is a block copolymer containing a polyether based segment and/or a polyester based segment and having one or more lactic acid segments having a number average molecular weight of 1,200-10,000 in the molecule. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
