abstract |
A positive displacement pump including a polymer part having a density of more than 0 to 3 g / cm 3 , a glass transition temperature (Tg) of 150 ° C. or higher, and a polymer component having a yield strength retention ratio of more than 90% after being immersed in engine oil at 150 ° C. for 7 days Production method. [Selection] Figure 1A |