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High productivity spandex fiber process and product

A technology of mixture and polyurethane urea, which is applied in the field of polyurethane urea, can solve the problems of limited application and achieve the effect of increased productivity and good product consistency

Active Publication Date: 2006-06-07
INVISTA TECHNOLOG IES S A R L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While there may be a small market for spandex fibers that do not have these properties, such niche market applications are very limited and it is the object of this invention to expand the spandex fiber industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] with TERATHANE  1800 and ISONATE  MDR prepared a polyurethane urea polymer typically used to make spandex at an end cap ratio of 1:1.69. The blocked diol had a %NCO of 2.6% and was diluted with DMAc to give a 45% solids solution. This solution is then contacted with a DMAc solution containing: a mixture of EDA and DYTEK  A chain extender mixture (90 / 10 molar ratio); and diethylamine as a chain terminator in a ratio such that the resulting polymer solution has an intrinsic viscosity of 0.95, an initial solution viscosity of 2600 poise, and contains The solids were 34.8% and had a measured number of chain extender ends of 15 meq / kg polymer solids. A 40 denier, 3 filament spandex yarn was spun from the polymer solution at 950 yards per minute (ypm). The intrinsic viscosity of the spun yarn was 1.16.

Embodiment 2

[0062] The polyurethaneurea polymers of the invention are prepared from a mixture of diisocyanates containing 82% of ISONATE  MDR and 18% MONDUR  ML. with TERATHANE  1800 to prepare capped diols with a capping ratio of 1:1.69. The capped diol was diluted to 55% solids with DMAc and reacted with a mixture of ethylenediamine and diethylamine in DMAc in proportions to obtain a polymer solution with an intrinsic viscosity of 0.75 and an initial solution viscosity of 3300 poise, and a solids content of 45%, and a measured number of chain extender ends of 40 meq / kg polymer solids. A 40 denier, 3 filament spandex yarn was spun from the polymer solution at 950 yards per minute (ypm). The intrinsic viscosity of the spun yarn was 1.34.

Embodiment 3

[0064] Preparation of polyurethane urea polymers from a mixture of diisocyanates containing 82% ISONATE  MDR and 18% MONDUR  ML. with TERATHANE  1800 to prepare capped diols with a capping ratio of 1:1.69. The capped diol was diluted to 55% solids with DMAc and reacted with a mixture of ethylenediamine and diethylamine in DMAc in proportions to obtain a polymer solution with an intrinsic viscosity of 0.75 and an initial solution viscosity of 3300 poise, and a solids content of 45%, and a measured number of chain extender ends of 15 meq / kg polymer solids. A 40 denier, 4 filament spandex yarn was spun from the polymer solution at 950 yards per minute (ypm). The intrinsic viscosity of the spun yarn was 1.02.

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PUM

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Abstract

Commercially acceptable spandex can be prepared with greater efficiency, improved consistency and at lower costs from a high-solids content polyurethaneurea polymer solution. The polyurethaneurea is prepared using a combination of 4,4'-MDI and 2,4'-MDI, and an amount of chain extenders and chain terminators such that the polymer solution, prior to spinning, is highly soluble and has an appropriate pre-spun IV and primary amine content.

Description

field of invention [0001] The present invention relates to a highly soluble polyurethane urea prepared from: (a) at least one polymeric diol; (b) a mixture of diisocyanates containing: (i) at least about 78 mole percent of 1 - isocyanato-4-[(4-isocyanatophenyl)methyl]benzene (4,4'-MDI); and (ii) at least about 5 mole % of 1-isocyanato-2-[( 4-isocyanatophenyl)methyl]benzene (2,4'-MDI); (c) at least one chain extender; and (d) at least one amine chain terminator. These high solids polymer solutions containing the polyurethaneureas can be used to significantly increase the production of spandex fibers without sacrificing fiber properties. The present invention also relates to a method of producing spandex fibers from said high solids solutions of polyurethane ureas, and to spandex fibers formed thereby. Background technique [0002] Spandex elastic fiber is the generic name of man-made fibers, and its fiber-forming material is a long-chain synthetic polymer containing at leas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/48C08G18/76D01F6/70
CPCC08G18/10C08G18/4854C08G18/7657D01F6/70Y10S528/906C08G18/3228C08G18/2865C08G18/08
Inventor G·W·塞林N·E·豪泽
Owner INVISTA TECHNOLOG IES S A R L