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Copolymer fibers and processes for making same

A copolymer and copolymerization technology, applied in the direction of fiber chemical characteristics, single-component synthetic polymer rayon, wet spinning method, etc., can solve the problems of low investment economy, expensive known methods, etc.

Active Publication Date: 2013-09-25
DUPONT SAFETY & CONSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Known methods of making copolymer fibers directly from polymerization solutions to produce acceptable products for ballistic and other aramid end uses are very expensive and have very low investment economics

Method used

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  • Copolymer fibers and processes for making same
  • Copolymer fibers and processes for making same
  • Copolymer fibers and processes for making same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0078] One unwashed yarn sample on the tube was placed in a continuously replenished overflow deionized water bath for 12 hours at -20°C. The yarn sample on the tube was then placed in contact with 1 liter of 2.0% by weight sodium hydroxide in water (0.5 moles NaOH / liter) for 1 hour. The yarn samples were then placed in a continuously replenished overflow deionized water bath for 1 hour at ~20°C. Excess liquid was then removed from the yarn and dried in a tube oven at 160°C. The yarn was then heat treated under nitrogen in a first oven at 300°C and 4.5 cN / dtex and then in a second oven at 450°C and 0.15 cN / dtex. Data on the approximate amounts of cations and their calculated concentrations are in Table 1. The molar ratio of effective polymer cation to sulfur content is about 1, and the hydrolytic strength is expected to remain at about 70%. In the tables, weight-percent, parts-per-million, and moles-per-kilogram are of elements in the yarn.

example 2

[0085] Example 1 was repeated, however the initial water wash was reduced from 12 hours to 8 hours. The molar ratio of effective polymer cation to sulfur content was about 0.5, and the hydrolytic strength was expected to remain about 55%, less than Example 1, reflecting the effect of the first water wash.

example 3

[0087] Example 1 was repeated, however the initial water wash was increased from 12 hours to 16 hours. The molar ratio of effective polymer cation to sulfur content was about 2, and the hydrolytic strength was expected to remain about 80%, greater than Example 1, reflecting the effect of the first water wash.

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PUM

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Abstract

The present invention concerns yarns comprising copolymer derived from the copolymerization of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl) benzimidazole; and terephthaloyl dichloride wherein the ratio of moles of 5(6)-amino-2-(p-aminophenyl) benzimidazole to the moles of para-phenylenediamine is 30 / 70 to 85 / 15; the yarn having a sulfur content greater than 0.1%; and the hydrolytic strength retention of the yarn is greater than 60%. The invention also concerns processes for making such yarns.

Description

technical field [0001] The present patent application relates to fibers and yarns composed of copolymers containing significant amounts of monomers having imidazole functional groups with long-term hydrolytic stability and processes for the preparation of such fibers and yarns. Background technique [0002] Advances in polymer chemistry and technology over the past few decades have initiated the development of high performance polymer fibers. For example, liquid crystal polymer solutions of rigid rod and semi-rigid rod polymers can be prepared by spinning the liquid crystal polymer solution into dope filaments, removing the solvent from the dope filaments, washing and drying the fibers; and further heat treating the dried Fibers are formed into high-strength fibers. An example of a high performance polymer fiber is a para-aramid fiber such as poly(p-phenylene terephthalamide) ("PPD-T" or "PPTA"). [0003] Fiber strength is usually related to one or more polymer parameters,...

Claims

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Application Information

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IPC IPC(8): D01D5/06D01F6/74D02G3/02D01F6/82
CPCD01D10/06D01F6/74Y10T428/2913D01D5/06D01F6/82D02G3/02
Inventor W.F.克诺夫C.W.纽顿
Owner DUPONT SAFETY & CONSTR INC
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