METHOD OF WATER DISPERSING PREGELATINIZED STARCH IN MAKING GYPSUM PRODUCTS

摘要

The invention provides in one embodiment a gypsum-containing slurry inclu ding stucco and an aqueous pre-dispersion of a pregelatinized starch. Also p rovided is a method of making gypsum wallboard by providing a pre-dispersion of the pregelatinized starch in water, and adding the pregelatinized starch pre-dispersion to the gypsum-containing slurry. The pregelatinized starch c an have a particle size distribution within the following range: d (0.1) = a bout 20 .mu. - 35 .mu., d (0.5) = about 60 .mu. - 110 .mu., d (0.9) = about 100 .mu. - 220 .mu..