PRODUCTION OF GLASS-MADE MOLD FOR CONTRACEPTIVE SHEATH

摘要

PURPOSE:To enable to form a rectangular recessed part by an HF treatment or the like by a method wherein after forming a photosensitive coated film on the surface of a master form, the thickness of the film is reduced, a pattern film is wound and irradiated with active rays to produce a cured part and an uncured part at the surface. CONSTITUTION:The maser form a is immersed in a photosensitive solution 10 consisting of a high-viscosity flexible photosensitve resin composition containing an unsaturated polyurethane as a main constitutent to produce the photosensitive coated film b on the surface, and the thickness of the film is uniformized at a value of not larger than 0.1mm. by a centrifugal separator. The surface is covered by a stickly thin film c such as a polyester film to protect and reinforce the surface. A positive or negative pattern film 1 is wound around the surface of the form, a black light-shielding paper is inserted into the master form a the whole is irradiated with UV rays from all directions by using UV lamp in a chamber maintained at 15-20 deg.C for 3-5min and the film is removed. As a result, the photosensitive part b' is cured, while the other part becomes a gelled part b'' and is removed by rinching. The master form a is immersed in an aqueous HF solution 12 to etch away the surface ecept the photosensitive part b', thereby producing the recessed part a'. Then, the photosensitive part b' is removed by a solution 13 of a peeling agent to produce a groove shaped recesses a' in a lattice form.