WEIGHT-REDUCING ADDITIVE COMPRISING POROUS CROSS-LINKED POLYESTER BEAD, AND WEIGHT-REDUCING COMPOSITION CONTAINING THE SAME

摘要

PURPOSE:To prepare the subject additive which dies not deform nor melt by heating and has a cell structure which is not destructed during mixing. CONSTITUTION:The objective additive is prepd. by dispersing an aq. suspension of an oxide and/or a hydroxide of an alkaline earth metal in an oil layer comprising an unsatd. polyester resin and a vinyl monomer capable of cross-linking the resin, dispersing the resulting water-in-oil emulsion in an aq. soln. of a dispersion stabilizer, cross-linking and curing the resin, and drying the resulting dispersion.