发明授权
US5149579A Polypropylene foam sheets 失效
聚丙烯泡沫板

Polypropylene foam sheets
摘要:
A thermoformable, rigid or semi-rigid polypropylene foam sheet having a smooth surface and a uniform cell structure and a density of at least 2.5 lbs/ft.sup.3 is prepared by extruding a mixture of a nucleating agent, a physical blowing agent and a polypropylene resin having a high melt strength and high melt elasticity.
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