Method for making expandable plastics
    10.
    发明授权
    Method for making expandable plastics 失效
    制造可膨胀塑料的方法

    公开(公告)号:US3883625A

    公开(公告)日:1975-05-13

    申请号:US34588573

    申请日:1973-03-29

    申请人: DOW CHEMICAL CO

    摘要: Layered sheet having selectively foamable layers is prepared employing a laminate of at least three layers of synthetic resinous materials, the outer layers are relatively permeable to a blowing agent and a central layer is relatively impermeable to a blowing agent. The laminated sheet is impregnated with a fluid (either liquid or gaseous blowing agent), the sheet exposed to conditions which permit loss of the blowing agent from the outer layers and subsequently heated to foam an inner or central layer.

    摘要翻译: 使用至少三层合成树脂材料的层压制备具有选择性发泡层的层状片材,外层对发泡剂相对可渗透,并且中心层对发泡剂相对不可渗透。 层压片材用流体(液体或气体发泡剂)浸渍,该片材暴露于允许来自外层的发泡剂损失并且随后被加热以使内层或中心层发泡的条件。