Process for the Preparation of Polyolefin Fibers

Inactive Publication Date: 2018-07-05
TOTAL RES & TECH FELUY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0021]It was surprisingly found that the process of the invention allows the manufacturing of polyolefin fibers having

Problems solved by technology

However, despite the potential mentioned above, the application of nanofibers has been limited due to its poor mechanical properties.
Electrospinning is preferred for the nanosize fibers but this technic presents some drawbacks such as the requirement for a high voltage elec

Method used

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  • Process for the Preparation of Polyolefin Fibers
  • Process for the Preparation of Polyolefin Fibers
  • Process for the Preparation of Polyolefin Fibers

Examples

Experimental program
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Example

Example 1

[0139]0.52 g of a UHMWPE (commercialized by Ticona under the name GUR® 4113; a linear polyethylene in powder form with a molecular weight of approximately 3.9 MM g / mol calculated using Margolies' equation (Mv (kdalton)=53.7IV1.49), an intrinsic viscosity (IV in dl / g) of about 17.90 dl / g as measured according to ISO 1628-3, and a molecular weight distribution ranging from 7 to 9 measured as described above) were mixed with 10 g nonan-2-ol. The mixture was placed in an oven at 180° C. and regularly mixed. A gel was progressively formed.

[0140]Once a homogenous gel was formed, a part of the hot gel was rapidly placed in the fiber producing device as described above and represented in FIG. 1. Then rotation of the spinneret was imposed at 16 000 RPM. The fibers were then collected on the collector 4.

[0141]Mean measured diameter of the produced fibers was 3.5 μm.

Example

Example 2

[0142]The procedure described in example 1 has been reproduced but the imposed rotation speed of the spinneret was 22 000 RPM. The mean measured diameter of the produced fibers was 0.9 μm.

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Abstract

The present invention relates to a process for the preparation of polyolefin fibers having mean fiber diameters of less than 5000 nm, comprising the steps of: a) preparing a polyolefin solution in a solvent, b) placing said polyolefin solution in a fiber producing device comprising a body configured to receive said polyolefin solution, said body comprising one or more openings, and c) rotating the fiber producing device, wherein rotation of the fiber producing device causes the polyolefin solution to be passed through said one or more openings to produce polyolefin fibers having mean fiber diameters of less than 5000 nm, wherein said polyolefin is selected from the group comprising polyethylene polymers and copolymers having a weight average molecular weight Mw of at least 40 000 daltons, and polypropylene polymers and copolymers, having a weight average molecular weight Mw of at least 120 000 daltons; wherein said fiber producing device is rotated at a speed of at least 10 000 revolutions per minutes (RPM). The invention also relates to said polyolefin fibers, and to articles comprising said fibers.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a process for the preparation of polyolefin fibers, preferably nanofibers, in particular for the preparation of polyethylene fibers. The present invention also relates to polyolefin fibers obtained therewith.BACKGROUND OF THE INVENTION[0002]There is a growing need for very fine fibers and fibrous webs made from very fine fibers. These types of webs are useful for selective barrier end uses. The nanofiber webs find use in a wide range of applications such as filtration, membrane separation, protective military clothing, biosensors, wound dressings, and scaffolds for tissue engineering. However, despite the potential mentioned above, the application of nanofibers has been limited due to its poor mechanical properties.[0003]Electrospinning and melt-blown spinning are the most widely used spinning methods to prepare polymeric fibers. Electrospinning is preferred for the nanosize fibers but this technic presents some drawbacks ...

Claims

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Application Information

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IPC IPC(8): D01D1/02D01F6/04D01F6/30D04H1/4291D04H1/724
CPCD01D1/02D01F6/04D01F6/30D04H1/4291D04H1/724D10B2321/0211D10B2321/022D01D5/18
Inventor LHOST, OLIVIERNAVEZ, PASCAL
Owner TOTAL RES & TECH FELUY
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