Method of making polyethylene foam
    7.
    发明授权
    Method of making polyethylene foam 失效
    制备聚乙烯泡沫的方法

    公开(公告)号:US3592785A

    公开(公告)日:1971-07-13

    申请号:US3592785D

    申请日:1968-12-05

    申请人: GRACE W R & CO

    摘要: A PROCESS FOR PREPARING POLYETHYLENE FOAM CONSISTING ESSENTIALLY OF FORMING A MIXTURE OF SOLID POLYETHYLENE AND NORMALLY SOLID, HEAT DECOMPOSABLE ORGANIC FOAMING AGENT HAVING A DECOMPOSITION TEMPERATURE AT LEAST ABOUT 10*C. ABOVE THE MELTING POINT OF THE POLYETHYLENE MATERIAL; SUBJECTING SAID ADMIXTURE TO HIGH ENERGY IONIZING RADIATION TO PRODUCE A PERCENT GEL OF ABOUT 30 TO ABOUT 80; HEATING THE IRRADIATED BODY IN STAGES, FIRST AT A TEMPERATURE SLIGHTLY BELOW THE DECOMPOSITION POINT OF THE FOAMING AGENT AND IMMEDIATELY THEREAFTER RAPIDLY HEATING TO A TEMPERATURE WELL ABOVE THE DECOMPOSITION POINT TO FORM AN EXPANDED BODY AND COOLING THE HEATED BODY TO A TEMPERATURE BELOW THE FREEZING POINT OF THE POLYETHYLENE.