The polyacrylate employed was a polymer predominantly containing isobutyl methacrylateand having a molecular weight of 50,000.Mixtures of two different organic binders which were mixed at the ratios (by wt. %) shown in Table 1 were employed in Working Examples 1 through 19.Subsequently, the above-obtained ceramic slurry mixture was subjected to reduced-pressure distillation in a hot bath at 60.deg