Poly 4-methyl-1-pentene(PMP) is a new thermoplastics with isotatic structure. The PMP is crystalline resin with melting point between 220℃ and 240℃ and good heat resistance

can be used at high temperature and has excellent electrical insulation and dielectric performance. Compared with polypropylene resin

the melting point is higher 60℃

dielectric constant and dielectric loss are similar. With the development of electronic industry in China

the usage amount of PMP has incresed significantly in recent years. At present

the PMP is only produced by Mitsui Chemical Corporation of Japan

of which the application is limited in China due to its limted production and high price. Therefore

the method of biaxial stretching is tried to produce poly methyl pentene (BOPMP) film

process it into metallized film to produce capacitor. Finally

the performance of the capacitor is correspondingly tested and evaluated. The breakdown voltage strength of BOPMP film produced with diffrent types has large difference and the loss angle tanget value and dielectric constant of BOPMP film capacitor are close to those of BOPP film capacitor at different frequencies

but its performance under high temperature needs verification further. The important research direction is how to improve the breakdown voltage and heat resistance of BOPMP film

develop PMP parcile material suitable for biaxial streching and produce high quality BOPMP capacitor film.