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Neutralized copolymer crumbs and process for their preparation

A technology of copolymerization and copolymerization, applied in the direction of one-component synthetic polymer rayon, textiles and papermaking, one-component polyamide rayon, etc., can solve the problems of low investment economy and expensive known methods

Active Publication Date: 2016-09-28
DUPONT SAFETY & CONSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Known methods of preparing 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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  • Neutralized copolymer crumbs and process for their preparation
  • Neutralized copolymer crumbs and process for their preparation
  • Neutralized copolymer crumbs and process for their preparation

Examples

Experimental program
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example 1

[0060] The second portion of the copolymer crumb has a different wash sequence. Wash 2 consisted of the following steps: The previously single washed copolymer crumb was washed with 4.2 g of 50% caustic and sufficient water for a total of 260 g. The pH was measured after the blender was running for three minutes and the material was filtered. The copolymer was then washed an additional eight times with distilled water only. Each wash consisted of adding distilled water to the previously washed filter cake until the total mass reached 260 g, further chopping in a Waring mixer for three minutes, measuring the pH of the slurry and filtering. The pH after each wash (2-10) is shown in the table. As can be seen from the wash data in the table, polymers in the pH range 5-9 were easily obtained with only a few washes.

[0061] After the final wash, the recovered copolymer was dried under vacuum at 120°C with a nitrogen purge. The measured intrinsic viscosity of this copolymer samp...

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Abstract

The present invention relates to a copolymer crumb derived from the copolymerization of p-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole and terephthaloyl dichloride, said copolymer crumb The granules have an intrinsic viscosity of at least 3 dl / g with a titratable acid of less than 0.4 mol / Kg. Furthermore, the present invention also relates to filaments and yarns formed from such polymer crumbs and methods for forming said filaments and yarns.

Description

technical field [0001] This patent application relates to the neutralization of acids in polymers derived from the copolymerization of p-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole and terephthaloyl chloride. Background technique [0002] Advances in polymer chemistry and technology over the past few decades have initiated the development of high-performance polymeric fibers. For example, liquid crystalline polymer solutions of rigid rod-like and semi-rigid rod-like polymers can be dried by spinning the liquid crystalline polymer solution into dope filaments, removing solvent from the dope filaments, washing and drying the fibers; and further heat treatment if desired for drying fibers to form high-strength fibers. An example of a high performance polymer fiber is a para-aramid fiber such as poly(paraphenylene terephthalamide) ("PPD-T" or "PPTA"). [0003] Fiber strength is generally related to one or more polymer parameters, including composition, molecula...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/32C08L77/10D01F6/60
CPCC08G69/32C08L77/10D01F6/605D01F6/60
Inventor K-S.李F.K.马尔朗C.W.纽顿
Owner DUPONT SAFETY & CONSTR INC
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