| 摘要 |
PURPOSE:To make possible to transport a large quantity at one time, by dispersing a polypropylene polymer containing a volatile foaming agent into a dispersion medium in a container, and opening one end of the container while keeping the suspension in the container at a specific temperature, so that the dispersion is released into a low pressure atmosphere. CONSTITUTION:0.04-0.08mol of a volatile foaming agent is incorporated into 100pts.wt. polypropylene polymer particles, and the mixture is dispersed into a dispersion medium in a closed container. While the temperature in the container is kept such that THD+30<T<=THD+45 (where T represents the temperture in the container in deg.C, and THD represents the heat distortion temperature of the polymer particle in deg.C), one end of the container is opened so that the polymer particles and the dispersion medium are simultaneously released from the container into an atmosphere whose pressure is lower than in the cntainer. As the volatile foaming agent, can be used aliphatic hydrocarbons such as propane, butane, etc., halogenated hydrocarbons such as trifluoromethane, etc. and cycloaliphatic hydrocarbons such as cyclobutane, etc. |
