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Polypropylene Staple and Bulked Continuous Filament Fibers

IP.com Disclosure Number: IPCOM000241856D
Publication Date: 2015-Jun-04
Document File: 2 page(s) / 94K

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The IP.com Prior Art Database

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John Michael Donahue: AUTHOR [+2]


An alternative solution is proposed for making polypropylene staple and bulked continuous filament fibers.

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Polypropylene Staple and Bulked Continuous Filament Fibers


An alternative solution is proposed for making polypropylene staple and bulked continuous filament fibers.


A common practice for making polypropylene (PP) staple and bulked continuous filament (BCF) fibers is to use 8-18 MFR reactor grade PP, i.e. not visbroken. The problem with such an approach is that production of 8-18 MFR reactor grade adds cost, for example, additional hydrogen and moreover making transition from lower MFR reactor grades and may be de- emphasized by resin producers creating issues with supply. An alternative, visbreaking low MFR material (e.g., 4 MFR HPP), could be employed during the staple melt spinning process, but this creates at least three challenges: 1) controlling the reactive extrusion process, 2) the degradation of expensive antioxidant additives, and 3) the reduction of melt strength that is desirable for the short spin staple production system. Visbreaking agents also may present storage and handling concerns that are atypical in a fiber manufacturing operation. Thus, an alternative solution is proposed.

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