To make a bolus keep durability against repeated use and various kinds of sterilization treatment by making transparent silicone gel as an inner packing material, using silicone rubber for an outer skin part, and mixing both materials to constitute the middle layer between both.
Silicone gel used for an inner packing material is made by mixing 398.4 pt. of polysiloxane, 1.6 pt. of methylhydrogen polysiloxane, and 0.06 pt. of 1% chloroplatinic acid alcohol solution, and agitation and completely defoaming at room temperature. Silicone rubber used for an outer skin part is made by mixing 99.66 pt. of a main agent, polysiloxane added with 4% of aerosol silica, 0.4 pt. of methyl hydrogen polysiloxane, and 0.02 pt. of 1% chloroplatinic acid alcohol solution, agitating, and completely defoaming at room temperature. The product is at 40°C kept for 15 hours so as to be a 0.6 mm thick outer skin to be cured. Next, a material made by mixing the material for silicone rubber used for the outer layer part and the material for silicone gel used for the inner packing material in a ratio of 1:2, agitating, and defoaming is coated thereon and kept at 40°C for 15 hours for curing.
HATAKEYAMA KAZUNORI
EBIHARA FUMITAKA
KOGA YOSHINORI
