| 摘要 |
PURPOSE: To obtain the subject material capable of reducing failure occurrence such as blister of its molded product even if subjected to high speed injection molding at elevated mold temperatures by blending a melamine solid resin having a specified methylenation rate with a phenolic resin and filler. CONSTITUTION: This molding material is obtained by blending (A) a phenolic resin (e.g. a novolak resin, a resol resin) and (B) a filler (e.g. glass fiber, slaked lime, etc.) with (C) a melamine solid resin having a methylenation rate of 50 to 80% in an amount ranging from 1 to 5wt.% based on the whole amount of the phenolic resin molding material. The molding material is obtained, for example, by blending the components A to C, a releasing agent such as zinc stearate, and a curing agent such as hexamethylenetetramine, and subjecting the mixture to mixing dispersion, kneading, granulation, etc. For this molding material, the mold temperature at its injection molding can be set at 190 to 210 deg.C. |
