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    • 4. 发明授权
    • Process for making large cross-section olefinic polymer foam structure
blown with 1, 1-difluoroethane
    • 用1,1-二氟乙烷吹制大截面烯烃聚合物泡沫结构的方法
    • US5411684A
    • 1995-05-02
    • US56231
    • 1993-04-30
    • Martin H. TusimChung P. Park
    • Martin H. TusimChung P. Park
    • C08J9/14B29C44/00
    • C08J9/149C08J2323/02
    • Disclosed is an extruded, unitary, closed-cell olefin polymer foam structure in plank form. The foam structure has a cross-section of 2 or more inches in one dimension and 18 or more inches in the other dimension. The olefin polymer material has a melt index of about 3.5 grams/10 minutes or less. The foam structure contains a blowing agent of about 75 mole percent or more 1,1-difluoroethane based upon the total moles of blowing agent. Further disclosed is a process for making the foam structure at a shear rate of about 400/second or more. It was found surprising that 1,1-difluoroethane which has relatively low solubility in olefin polymers, could be used to make olefin polymer foam structures of large cross-section.
    • 公开了一种板状的挤出的,单一的闭孔烯烃聚合物泡沫结构。 泡沫结构在一个尺寸上具有2英寸或更多英寸的横截面,在另一个尺寸上具有18英寸或更多英寸的横截面。 烯烃聚合物材料的熔体指数为约3.5克/ 10分钟或更短。 泡沫结构含有基于发泡剂总摩尔数的约75摩尔%或更多的1,1-二氟乙烷的发泡剂。 进一步公开的是使泡沫结构的剪切速率为约400 /秒以上的方法。 发现在烯烃聚合物中具有较低溶解度的1,1-二氟乙烷可用于制备具有大横截面的烯烃聚合物泡沫结构。