| 摘要 |
PURPOSE:To obtain crosslinked foam simply by a method wherein a mixture in which vinyl alkoxy silane with Lewis acid and radical generating agent are mixed with polyethylene is supplied to an extruder to be melted and expanding agent is forced in from the intermediate part of the extruder. CONSTITUTION:Vinyl alkoxy silane with Lewis acid and radical generating agent are mixed with polyethylene. This mixture is supplied to an extruder to be heated and melted. On the other hand, foaming agent is forced into said heated and molten polyethylene mixture from the middle of the extruder and expandable component kneaded in the extruder is extruded into a low pressure zone such as the atmosphere, etc. At that time, the working amout of radical generating agent is made 0.1-10pts.wt. to 100pts.wt. of vinyl alkoxy silane and vinyl alkoxy silane is 0.5-5pts.wt. to 100pts.wt. of polyethylene. By the above- mentioned method, polyethylene foam that has been crosslinked at a stroke can be obtained. |
