| 摘要 |
PURPOSE:To obtain an anti-blocking agent for use in transparent resin films, by using an alumino-silicate which is made amorphous by replacing sodium ions of type A zeolite with Ba ions as a component. CONSTITUTION:An anti-blocking agent consists of an aluminosilicate which is made amorphous by replacing sodium ions of type A zeolite with Ba ions. A type A zeolite having a light transmittance of 1,43-1.53 is preferred from the viewpoint of the retention of the transparency of resins. A type A zeolite wherein at least 30% sodium ions are exchanged with barium ions is preferred. The Ba-type A zeolite can be prepd. by suspending Na-type A zeolite in an aq. soln, contg. Ba ions to react them for a given period of time or longer.
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