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POLYPROPYLENE COMPOSITIONS AND TAPES HAVING IMPROVED TENACITY

IP.com Disclosure Number: IPCOM000215277D
Publication Date: 2012-Feb-23
Document File: 1 page(s) / 14K

Publishing Venue

The IP.com Prior Art Database

Abstract

The composition of this technology produces slit tapes (such as “raffia”) with higher tenacity than the polypropylene products traditionally used and also higher than polypropylene/high density polyethylene blending technology. The problem is how to improve the tenacity of polypropylene homopolymers to enable (a) the downgauging of polypropylene tapes and fabrics, and/or (b) the use of polypropylene fibers/tapes/fabric in applications requiring higher tensile strength (tenacity) such as flexible industrial bulk containers (FIBC) and components of FIBC’s such as “super-sacks” or “bulk-bags”. Traditional products achieve 5.9-6.3 grams/denier tenacity at best. The product of this technology achieves 7 g/d at 7x draw at least.

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POLYPROPYLENE COMPOSITIONS AND TAPES HAVING IMPROVED TENACITY

The composition of this technology is for the production of slit tapes (such as "raffia") with higher tenacity than the polypropylene products traditionally used. The problem is how to improve the tenacity of polypropylene homopolymers to enable (a) the downgauging of polypropylene tapes and fabrics, and/or (b) the use of polypropylene fibers/tapes/fabric in applications requiring higher tensile strength (tenacity) such as flexible industrial bulk containers (FIBC) and components of FIBC's; i.e. large bulk bags containing 1000 kg. Traditional PP products achieve 5.5-6.3 grams/denier tenacity at best. The product of this technology can achieve 7 g/d at a 7x draw ratio.

Traditionally slit tape polypropylene grades are made with reactor grade homopolymer of medium xylene solubility (2.5 to 4%). In this technology, we use high crystalline (low xylene solubles; <2.0%) polypropylene also having a very narrow molecular weight distribution. Typically for good drawability as needed in raffia, the opposite attributes are desired. For example, broad molecular weight distribution and high xylene solubles products are preferred. Products with low xylene solubles and narrow molecular weight distribution have not been applied to raffia / tape applications due to perceived difficulties in drawability and/or potential splittiness. Furthermore the catalyst/donor used for these products is not typical for homopolymer pr...