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1.发明授权Process for extruding a foamed closed-cell polyolefin extrudate substantially free from cell collapse by use of a barrier material 失效通过使用障碍物材料来挤出泡沫封闭细胞多聚蛋白的方法大大减少细胞皱缩
公开(公告)号：US3810964A
公开(公告)日：1974-05-14
申请号：US18226871
申请日：1971-09-20
Applicant: POLYTECH SYSTEMS
Inventor： EHRENFREUND H
CPC classification number: C08J9/143 , B29C44/50 , B29K2023/00 , B29K2105/046 , C08J9/0023 , C08J9/0061 , C08J2323/02 , C08K5/11 , C08K2201/008 , Y10S264/05 , C08L23/02
Abstract: PREPARATION OF A POLYOLEFIN FFOAM BY EXTRUDING A COMBINATION OF MATERIALS INCULDING A CHEMICALLY INERT, PARTICULATE NUCLEATION SYSTEM, AN EXPANDING AGENT TOGETHER WITH PETROLEUM NAPTHA WHICH PROMOTES FOAMING IN A LOW PRESSURE AMBIENT, AN IONOMER, AND A BARRIER MAATERIAL OF HIGH MELT STRENGTH WHICH IMPROVES THE PROPERTIES OF THE POLYMER AND ALSO SERVES DURING FOAMING AS A BLOCKING MECHANISM AGAINST POST-EXTRUSION CELL COLLAPSE.
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