Melt spun polyether TPU fibers having mixed polyols and process

A technology of melt spinning and polyether, which is applied in the field of preparing melt-spun TPU fibers, which can solve problems such as loss of output and high cost of downtime

Active Publication Date: 2006-09-06
LUBRIZOL ADVANCED MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is costly downti

Method used

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  • Melt spun polyether TPU fibers having mixed polyols and process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Example 1 is a comparative example of the prior art TPU, which shows that a single polyether intermediate and an aliphatic chain extender are used to prepare TPU. Example 2 is also a comparative example, which shows that a single polyether intermediate and an aromatic chain extender together with a chain extender are used to prepare TPU. Example 3 is the TPU of the present invention, which contains a mixed polyether intermediate and an aromatic chain extender. Example 4 is the most preferred TPU of the present invention, which is a TPU containing a mixed polyether intermediate and an aromatic chain extender together with a chain extender. Example 5 is similar to Example 4, except that Example 5 contains a higher amount of lower molecular weight polyether intermediate. Example 6 is a comparative example of the prior art TPU showing a polyester intermediate and an aliphatic chain extender. Example 7 represents a fiber melt-spun from each TPU of Examples 1-6, in which 10 wt% o...

Embodiment 2

[0067] Example 2 (comparative)

[0068] In a 40mm co-rotating twin-screw extruder, in the presence of 50 ppm stannous octoate as a catalyst, a mixture of substances preheated to 120°C or below was mixed with 17.5440 parts by weight of MDI and 0.4 parts by weight at a temperature of 200°C Lubricant reaction: 76.0761 parts by weight of molecular weight (Mn) 2000 polyether intermediate (PTMEG), 5.116 parts by weight of benzene glycol (HQEE) chain extender, 1.2435 parts by weight of hydroxyethyl resorcinol (HER ) Chain growth aid, 0.3 parts by weight of antioxidant and 0.3 parts by weight of UV stabilizer. The resulting polymer was pelletized underwater and collected in a silo heated at 105°C to dry the product. The molecular weight (Mn) of the resulting TPU was 150,000 Daltons, and was used in Example 7 to prepare melt-spun fibers.

Embodiment 3

[0070] In a 40mm co-rotating twin-screw extruder, in the presence of 50 ppm stannous octoate as a catalyst, a mixture of substances preheated to 120°C or below was mixed with 21.5760 parts by weight of MDI and 0.4 parts by weight at a temperature of 200°C Lubricant reaction: 54.8968 parts by weight of polyether intermediate (PTMEG) with molecular weight (Mn) 2000, 23.5272 parts by weight of polyether intermediate (PTMEG) with molecular weight (Mn) 1000, 8.2149 parts by weight of benzene glycol (HQEE) ) Chain extender, 0.3 parts by weight of antioxidant and 0.3 parts by weight of UV stabilizer. The resulting polymer was pelletized underwater and collected in a silo heated at 105°C to dry the product. The molecular weight (Mn) of the resulting TPU was 150,000 Daltons, and was used in Example 7 to prepare melt-spun fibers.

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Abstract

Thermoplastic polyether polyurethane polymers are disclosed which are mixed with a crosslinking agent to achieve long run times in a melt spinning process to make elastic fibers. The crosslinking agent is preferably a polyether or polyester polyol reacted with a diisocyanate. A melt spinning process is also disclosed using a polyether polyurethane with a crosslinking agent. Long melt spinning run times can be achieved without experiencing excessive pressure buildup in the spinneret and fiber breakage. The thermoplastic polyether polyurethane polymers are made by reacting: (1) a blend of two or more hydroxyl terminated intermediates wherein one intermediate is a polyether intermediate and has a higher number average molecular weight than the other said polyether intermediates, and wherein the weighted average number average molecular weight of said blend is greater than 1200 Daltons; (2) at least one polyisocyanate; and (3) at least one hydroxyl terminated chain extender. Melt spun fibers dislcosed have excellent dye pickup, bleach resistance, and color fastness. The melt spun fibers can be dyed with polyester fibers and retain excellent physical properties.

Description

[0001] cross reference [0002] This patent application is filed based on provisional application No. 60 / 483,823 filed on June 30, 2003 and claims its priority. Invention field [0003] The present invention relates to a thermoplastic polyurethane (TPU) composition for preparing melt-spun elastomeric fibers such as Spandex with improved bleach resistance and capable of withstanding the dyeing conditions of polyester fibers. The present invention also relates to a method for preparing melt-spun TPU fibers in which the working time before experiencing fiber breakage is greatly increased. Background of the invention [0004] The vast majority of TPU fibers are prepared by dry spinning methods that involve dissolving TPU in a solvent. The melt spinning method for preparing TPU fibers has several inherent advantages, including less cost, less capital cost, and less environmental concerns due to the absence of volatile so...

Claims

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Application Information

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IPC IPC(8): C08G18/12C08G18/48C08G18/32C08L75/04D01F6/70
Inventor R·R·韦杜拉Y·埃克斯坦夏饮冰J·E·小布赖森C·A·斯普拉格J·法卡斯
Owner LUBRIZOL ADVANCED MATERIALS INC
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