Biodegradable hook-type molded surface fastener with outstanding moldability

8:

• A method for producing a molded hook surface fastener, the method comprising:
• covering a surface of a metal roll that has on its surface a large number of cavities with a molten resin mixture of the following (6) in a sheet form while pressing the molten resin mixture into the cavities, wherein each of the cavities is made into a shape corresponding to a hook engaging element satisfying the following (4) and (5);
• solidifying the resin mixture in the cavities;
• and
• peeling the sheet of the resin mixture from the surface of the metal roll while pulling the solidified resin mixture out of the cavities;
• (4) the cavity tapers from the surface of the metal roll to a distal end portion and bends gradually from its middle along a circumferential direction of the metal roll, and the distal end portion faces a direction slightly approaching the surface of the metal roll;
• (5) on the surface of the metal roll, a plurality of cavities are arranged in a row in the circumferential direction of the metal roll, and a plurality of such rows are present in the width direction of the metal roll, wherein one row or a plurality of rows of cavities that extend in the circumferential direction and another different row or plurality of rows of cavities that bend in a direction opposite to a bending direction of the above cavities and extend in the circumferential direction are alternately arranged;
• (6) the resin mixture comprises polybutylene succinate (A) as a continuous phase and starch (B) as a dispersed phase, wherein the dispersed phase is mixed with polyvinyl alcohol (C), the starch (B) comprises a modified starch, and an amylose content of the starch (B) is 45% by weight or more.