Abstract: Disclosed are a solid catalyst for producing polypropylene and a method for producing a block copolymer, particularly, disclosed are a solid catalyst for producing polypropylene, which has high activity and excellent hydrogenation activity and is capable of producing a block copolymer having high stereoregularity and a high rubber content by copolymerization of alpha-olefins, and a method for producing a block copolymer.

Abstract: There is provided structure of a brush of a fuel pump for a vehicle in which the brush is formed of two kinds of different materials unlike a typical brush which is formed of only one material, more particularly, a high resistance material is used at one side portion only of the brush, and the same efficiency is ensured as that of the typical brush formed of low resistance material only, by suppressing the spark generation even in use of ethanol and low grade fuels and suppressing the spark generated in high current fuel pump and minimizing the abrasion of the structure due to decrease of spark generation, thereby ensuring the durability and the reliability and improving the EMI characters due to decrease of spark noise of the fuel pump.