inner hole of the screw in this way the degree of shearing is more increased as the gap is made narrower and the size of the inner diameter of the hole is made smaller however it is necessary to optimize the gap and the inner diameter of the hole of the screw in view of viscosity of the resin the time required for shearing the resin contained in the cylinder is 1 to 10 minutes as described above according to the present invention it is possible to melt and shear at least incompatible resin without adding an additive such as a compatibilizer when it is assumed that one of high molecular components is a matrix by melting and shearing a high molecular blended product is formed by controlling a disperse phase size of the other high molecular component to be in a size of several tens nanometers poly vinylidene fluoride pvdf and polyamide 11 pa11 used were commercially available kf850 kureha chemical japan and rilsan bmn o atofina co ltd respectively all the polymers were dried in a vacuum oven at 100 u00b0 c for 12 h before processing high shear processing was performed using a high shear apparatus hse3000mini imoto co japan as explained in fig1 a feedback type screw was used in this high shear apparatus the l d ratio of the screw was about 1 78 the.