Feeding performance of low-melting Polymer Processing Additive Preblends
AssigneeNational Industrialization Company (TASNEE)
InventorsJayanta Bera, Mohammed Ali Ghanchi, Mukesh K. Yadav
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Abstract
An additive preblend for production of cap and closure grade polypropylene comprises a mixture of low melting temperature additives and higher melting temperature additives. Inclusion of the higher melting temperature additives eliminates dusting, bridging, and choking issues encountered when adding the lower melting temperature additives separately to a screw feeder for a polypropylene extruder.
Claims20
An additive preblend for production of thermoplastics, the additive preblend comprising a mixture of a lower melting temperature additive and a higher melting temperature additive.
An additive preblend for production of cap and closure grade polypropylene, wherein the additive preblend contains seven different additives.
A method for manufacturing polypropylene for production of cap and closures using a one-pack preblend, the method comprising the following steps:
- mixing a lower temperature melting additive comprising erucamide and glyceryl monostearate with at least one higher melting temperature additive required for a specified cap and closure grade polypropylene to form a preblend mixture;
- feeding the preblend mixture of erucamide, glyceryl monostearate, and the at least one higher melting temperature additive through a hot extruder to form pellets;
- and
- feeding the pellets, polypropylene, and any additional additives through a screw feeder to an extruder to make the specified cap and closure grade polypropylene.
Dependencies are inferred from the claim text.