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Fiber comprising polyethylene blend

A polymer, blend technology, applied in the field of spunbond nonwovens, which can solve the problems of low modulus and tensile strength, lack of similar modulus and tensile strength

Active Publication Date: 2015-10-28
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fibers of ethylene-based polymers and nonwoven fabrics made from them have lower modulus and tensile strength when compared to equivalent fibers and fabrics made from polypropylene
Lack of similar modulus and tensile strength in replacing polypropylene with softness-enhancing ethylene-based polymers is a challenge due to requirements related to downstream processing of nonwovens into hygiene products such as baby diapers and end-use performance requirements

Method used

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  • Fiber comprising polyethylene blend
  • Fiber comprising polyethylene blend
  • Fiber comprising polyethylene blend

Examples

Experimental program
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example

[0142] 1. Materials

[0143] The materials of the examples and comparative samples are listed in Table 1 below.

[0144] Table 1

[0145]

[0146] Resins classified as HDPE and LDPE are commercially available from The Dow Chemical Company. HDPE1 is an ethylene-octene copolymer prepared via solution polymerization in the presence of a catalyst system comprising a polyvalent aryloxyether metal complex metal complex as described above in a dual reactor configuration connected in series.

[0147] LDPE resins represent MIs ranging from 2 g / 10 min to 35 g / 10 min and include tubular and autoclave grades. Polypropylene (PP) D549 is a fiber-grade propylene homopolymer purchased from Braskem USA.

[0148] HDPE1 in a double loop reactor system in a polyvalent aryloxyether catalyst, namely [2,2"'-[1,3-propanediylbis(oxyl-κO) with the structure (I) disclosed above ]bis[3″,5,5″-tris(1,1-dimethylethyl)-5′-methyl[1,1′:3′,1″-terphenyl]-2′-hydroxyl Even-κO]]dimethyl-, (OC-6-33)-zirconiu...

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Abstract

The present disclosure is directed to a fiber that is composed of a polymeric blend including (i) 95 wt % to 99 wt % of a high density ethylene-based polymer having a Mw / Mn from 2.0 to 3.0 and (ii) from 5 wt % to 1 wt % of a low density ethylene-based polymer having a melt index from 5 g / 10 min to 15 g / 10 min. The fiber has a density from 1 denier to 2 denier and a 3% secant modulus from 8.5 g / denier to 20 g / denier.

Description

Background technique [0001] The present invention relates to fibers of ethylene-based polymers suitable for use in spunbond nonwovens. Spunbond nonwovens are widely used in various applications such as hygiene, medical, industrial or automotive applications to provide low basis weight, economical, strong and cloth-like fabrics. In the case of hygiene articles such as diapers, soft non-woven fabrics are required. The ethylene polymer-based fibers used in the nonwoven fabric provide enhanced softness to the fabric when compared to conventional nonwoven fabrics based on polypropylene. However, fibers of ethylene-based polymers and nonwoven fabrics made therefrom have lower modulus and tensile strength when compared to equivalent fibers and fabrics made from polypropylene. Lack of similar modulus and tensile strength in replacing polypropylene with softness-enhancing ethylene-based polymers is a challenge due to requirements related to downstream processing of nonwovens into hyg...

Claims

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Application Information

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IPC IPC(8): D01F6/46D01D5/08D04H3/16
CPCD01F6/46D01D5/08D04H3/007D04H3/16C08L23/06
Inventor A·T·洛伦佐S·本萨松J·A·德古鲁特
Owner DOW GLOBAL TECH LLC