| 摘要 |
<p>An expandable vinyl chloride resin composition containing not an organic solvent type blowing agent but a thermal decomposition type one and being capable of giving products of expansion molding which are extremely improved in expansion ratio without remarkable lowering in the surface properties and strength. This composition comprises 100 parts by weight of a vinyl chloride resin, 0.5 to 30 parts by weight of a processing aid consisting of a (meth)acrylate two-step polymer which is prepared by polymerizing a monomer component mainly comprising one or more members selected from among methacrylic esters (except methyl methacrylate) and acrylic esters in the presence of a latex of a methyl methacrylate polymer having a specific viscosity of 0.7 or above (0.1% chloroform solution, 30 °C) and has a specific viscosity of 0.5 or above, 0.3 to 25 parts by weight of a thermal decomposition type inorganic blowing agent, 0.01 to 15 parts by weight of a thermal decomposition type organic blowing agent, and 0 to 20 parts by weight of a filler.</p> |
