| 摘要 |
PURPOSE:To obtain a product excellent in the resistance to impact and chemicals by forming multiple layers of protective films applied on the surface of the outer tube from high molecular compounds different in the hardening mechanism while it is made transparent or partially colored opaque. CONSTITUTION:A catalytically hardening type epoxy film which is better in the adhesion to the glass surface of a glass outer tube 4 while strongly adhesive to the second layer is formed on the first layer 6 in contact with the surface thereof 4, a solvent drying type polyurethane film great in the impact resistance with a high toughness on the second layer 7 and a moisture hardening type polyurethane film high in the chemical resistance and surface hardness on the third layer 8. In addition, the fourth layer and more are superposed with films similar in the characteristic to the third layer but different in the hardening mechanism as required. |
