| 摘要 |
PURPOSE: Provided is a process for producing non-flying plastic microballoons, which are free of problems in production such as difficulties in automated metering and packing work caused by the excessive stickiness of microballoons prevented from flying with a wetting agent, and other problems such as problems in handling upon use. CONSTITUTION: The process for the production of non-flying plastic microballoons, comprises bringing unexpanded, expandable plastic microballoons, which have been heated to a temperature lower than an expansion starting temperature thereof, and a mixture of a wetting agent and gas, the mixture having been heated to a temperature at least equal to said expansion starting temperature of the expandable plastic microballoons, into contact with each other to cause expansion of said expandable plastic balloons, and then cooling the resulting expanded plastic balloons.
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