| 摘要 |
<p>PURPOSE:To obtain a continuous foamable material having a high gas permeability and conveniently usable as a seat covering material for motor cars, by kneading with heat a mixture of a plastisol-preparing vinyl chloride resin, a stabilizer and a thermally decomposable, chemical foaming agent, rolling the resulting mixture into a sheet, and heating the sheet to a temperature at which the foaming agent is decomposed. CONSTITUTION:(a) A vinyl chloride resin which is generally used for preparing a plastisol and which is obtained by an emulsion polymerization method or a block polymerization method, (b) a plasticizer, (c) an organic liquid stabilizer containing a single or a plurality of group II metals in the periodic table and a metal in another group, and (d) a powdered, thermally decomposable, chemical foaming agent, such as azodicarbonamide which is generally used as a closed-cell-forming foaming agent, are mixed together. The resulting mixture is kneaded with heat, and rolled into sheet by a calender method or an extrusion method. The sheet thus obtained is heated to a temperature at which the foaming agent is decomposed, to obtain an objective continuous cell structure.</p> |
