| 摘要 |
PURPOSE:To improve the lubricity of a spool surface and to decrease the frictional resistance with a cap by forming the spool of a carbon black, carboxyl modified silicone oil and polystyrene resin contg. a specific ratio of rubber. CONSTITUTION:0.05-3.00wt% Carbon black (B), 0.20-2.00wt% carboxyl modified silicone oil (C), and 0.5-6.0wt% rubber (e.g.: butadiene rubber) are added to the polystyrene resin (A) forming the spool. The component B is preferably furnace black for >=50% and the component C is preferably the silicone oil expressed by the formula. A phenolic or phosphorus antioxidant can be incorporated into the component A. The load tension during the drawing out of a photographic film is thereby decreased and the cutting of the film is prevented. |
