| 摘要 |
PURPOSE:To prepare the titled compsn. producing uniform, fine expanded cells, by incorporating a powdered vinyl chloride resin with a dispersion of a thermally decomposable blowing agent in a plasticizer. CONSTITUTION:A thermally decomposable blowing agent with an average particle size of 30mu or below (e.g., azodicarbonamide) (A) and a plasticizer (e.g., dioctyl phthalate) (B) are blended by a ribbon blender, butterfly mixer, etc. and then mixed in an ink mill to disperse the component A into the component B forcibly, thus forming a dispersion. 100pts.wt. powdered vinyl chloride resin having a particle size of 40-300mesh, a mean degree of polymn. of 500-150, and the content of vinyl chloride of 50wt% or more is incorporated with the resulting dispersion so that the component A of 1-10pts.wt. and the component B of 30-130pts.wt. are attained to yield a vinyl chloride resin compsn. for sinter foaming. Then, the compsn. is applied onto a plain belt, and sintered and foamed by heating at 150-300 deg.C for several sec - 30min.
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