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Neutralized copolymer crumb and processes for making same

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

Active Publication Date: 2013-09-18
DUPONT SAFETY & CONSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 crumb and processes for making same
  • Neutralized copolymer crumb and processes for making same
  • Neutralized copolymer crumb and processes for making same

Examples

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example 1

[0060] The second portion of copolymer crumbs had a different wash sequence. Wash 2 consisted of washing the previously single washed copolymer crumb with 4.2 g of 50% caustic and sufficient water to total 260 g. The pH was measured after the blender had run 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 washing data in the table, polymers with a pH in the range of 5-9 were readily 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 intrinsic viscosity of the copolymer sample was measured to be 6.8 dl / g....

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Abstract

The invention concerns copolymer crumb derived from the copolymerization of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole, and terephthaloyl dichloride having an inherent viscosity of at least 3 dl / g having less than 0.4 mol / Kg of titrate-able acid. In addition, the invention concerns filaments and yarn formed from such polymer crumb and processes for forming the filaments and yarn.

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 enabled the development of high performance polymeric fibers. For example, liquid crystalline polymer solutions of rigid rod and semi-rigid rod 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. The 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, including composition, molecular weight, inte...

Claims

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Application Information

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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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