Polyethylene(PE)compounded with antiblock provides thin films that are easier to separate from other film layers.However,to achieve desired antiblocking properties,most commercial antiblocks generate polyethylene film with reduced optical haze and gloss.Our research shows that an excellent balance of haze,gloss,polymer color and antiblocking properties in PE film can be achieved with unique new antiblocks derived from a special class of diatomaceous earth(DE).Of particular interest is DE derived from MELASIRA diatoms(derived from fresh water),which show consistent size and shape,as distinguished from other ore bodies of greatly varying shapes.When this DE is fluxed,milled and classified,unique and outstanding new antiblocks are achieved which create PE film with superior color,gloss,and haze compared to using other DE and natural silica antiblocks.Details of the experiments and property measurements are discussed,and show unique enhancements of these new antiblocks in color,haze,gloss and antiblocking performance in LDPE,LLDPE,and metallocene LLDPE.
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