| 摘要 |
PROBLEM TO BE SOLVED: To product the subject lightweight foam capable of highly expanding a stabilized uniform cell structure even when a large amount of an inorganic filler is contained as a main component and excellent in heat insulating properties, etc. by adding an additive such as a vinyl chloride resin or a foaming agent to an inorganic filler as a substrate, kneading the resultant mixture and thermally expanding the kneaded mixture. SOLUTION: (C) An additive in an amount of 32-120 pts.wt. is added to (A) 5-50 pts.wt. of a vinyl chloride resin and (B) 50-95 pts.wt. of an inorganic filler and the resultant mixture is then kneaded to provide a compound, which is then thermally expanded in a metal mold. For example, talc having a fineness so as to pass >=90% thereof through a 150-mesh sieve is used as the component B in order to improve the dispersibility thereof, and a foaming agent such as azodicarbonamide, an organic solvent such as toluene and a plasticizer, etc. such as dimethyl phthalate are preferably used as the component C. |
