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Melt spun TPU fibers and process

A fiber and footwork technology, applied in the field of melt-spun TPU fiber production, can solve the problems of high cost and downtime, and achieve the effect of extending the time

Active Publication Date: 2008-05-28
LUBRIZOL ADVANCED MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is costly in downtime and lost production

Method used

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  • Melt spun TPU fibers and process
  • Melt spun TPU fibers and process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1 shows the preparation of a polyether TPU polymer using PTMEG as the hydroxyl terminated polyether polyol, MDI as the polyisocyanate, and 1,4-butanediol as the chain extender. The one-step process described above was used to prepare the TPU of Example 1. The TPU polymer from Example 1 was used in Examples 2-6 for melt spinning trials. Example 2 is a comparative example using a polyether crosslinker and Examples 3-6 use a polyester crosslinker according to the invention.

[0050] Example 1

Embodiment 2

[0052] Example 2 (comparative example)

[0053] The TPU polymer of Example 1 was pre-dried in a vacuum batch dryer at 80°C for 12 hours. After drying the TPU polymer was melted in a 1.25 inch single screw extruder with an L / D ratio of 24. With loop control, the back pressure at the exit of the extruder is kept constant. The extruder contained four heating zones maintained between 180°C and 219°C. On exiting the extruder, the TPU polymer melt was mixed with 13.1 wt% of a polyether prepolymer crosslinker having a number average molecular weight of 1500 (Hyperlast 5196). Pump the crosslinker from the holding tank at a constant flow. The crosslinker was mixed with the TPU polymer melt in a dynamic mixer and then pumped through manifolds to 32 spinnerets. Each spinneret had an orifice size of 0.5 mm. The polymer stream exiting the spinneret was air cooled and the formed fibers were wound into bobbins at a winding speed of 480 m / min. The fibers on the aging spool were heated...

Embodiment 3

[0056] This example is presented to show that polyester crosslinkers give much less spinpack pressure buildup than the polyether crosslinkers used in Example 2.

[0057] TPU polymer, melt spinning equipment and conditions were the same as described in Example 2 above. The only difference is the crosslinker used. In this example, 14.0 wt% polyester crosslinker was used. The polyester crosslinker used was purchased from Hyperlast Company 5128, its number average molecular weight is 2500.

[0058] The fibers produced were 20 denier and at the same speed as Example 1 (480 m / min).

[0059] Measure the spin pack pressure during the run. Figure 1 shows a graph of the pressure buildup during operation. The data shows that the spin pack pressure at the start of the run is about 15Kg / cm 2 . After about 8 hours, the spin pack pressure increased to 20 Kg / cm 2 . The run lasted a total of 110 hours and the spin pack pressure was maintained at 20 Kg / cm 2 . There were no fiber bre...

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Abstract

Thermoplastic polyether polyurethane polymers are disclosed which are mixed with a non-polyether crosslinking agent to achieve long run times in a melt spinning process to make elastic fibers. The crosslinking agent is preferably a polyester polyol reacted with a diisocyanate. A melt spinning process is also disclosed using a polyether polyurethane with a polyester crosslinking agent. Long melt spinning run times can be achieved without experiencing excessive pressure buildup in the spinneret and fiber breakage.

Description

[0001] Cross References to Related Applications [0002] This patent application claims priority to U.S. Provisional Application Serial No. 60 / 461,473, filed April 9,2003. field of invention [0003] The present invention relates to thermoplastic polyurethane (TPU) compositions useful in the preparation of melt-spun elastic fibers, such as spandex. The present invention also relates to a method of producing melt-spun TPU fibers in which the run time is greatly increased before experiencing fiber breakage. Background of the invention [0004] A wide variety of TPU fibers have been prepared by dry spinning processes involving dissolving TPU in a solvent. The melt spinning method of producing TPU fibers has several inherent advantages including less cost, less investment cost, and less environmental concern due to the absence of volatile solvents. [0005] The TPU composition used to make melt-spun fibers comprises a TPU polymer prepared from: a hydroxyl-terminated intermedi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/76D01F6/70C08G18/08C08G18/10C08G18/42
CPCC08G18/0895C08G18/10C08G18/4238C08G18/6674D01F6/70Y10T442/635C08G18/66
Inventor R·R·韦杜拉夏饮冰
Owner LUBRIZOL ADVANCED MATERIALS INC
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