| 摘要 |
PROBLEM TO BE SOLVED: To reduce the bonding strength of a hydrophilic polymer article with the surface of a mold by forming a cavity from a mold material prepared by adding an internal release agent or a surfactant to a thermoplastic polymer and a molding resin comprising either one of polystyrene and polypropylene as an additive. SOLUTION: A projected surface 33 and a recessed surface 34 requires optically smooth quality. A mold material is infiltrated in a thermoplastic polymer and a thermoplastic material comprising polystyrene or polypropylene and contains about 0.1-20 wt.% of an internal additive. The additive is polyethylene or polypropylene wax with a mol.wt. of about 5,000-200,000, stearate, gycerol ester with a mol.wt. of about 200-2,000, amide wax represented by formula R1 CONH2 , silicone with a mol.wt. of about 2,000-100,000, Montan wax, oxidized wax, fatty acid with a mol.wt. of about 200-2,000, complex ester or a combination of them. |
