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Process for preparing aramid copolymer

A technology for polymers and p-phenylenediamine, which is applied in the field of preparing aromatic polyamide polymers, and can solve problems such as reducing tensile properties

Inactive Publication Date: 2014-04-30
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oligomeric species act as defects, causing premature fracture and thus reducing tensile properties

Method used

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  • Process for preparing aramid copolymer
  • Process for preparing aramid copolymer
  • Process for preparing aramid copolymer

Examples

Experimental program
Comparison scheme
Effect test

example

[0065] NMP, DMAC, LiCl, CaCl 2 , DAPBI, PPD and TCl were obtained from commercial sources.

example 1

[0067] This example shows a single addition of TCl to polymerize to make a DAPBI / PPD-T copolymer.

[0068] Add 56.98 g of NMP / CaCl to a 1 L reactor equipped with frame stirrer, nitrogen inlet / outlet 2 Premix (8.3% by weight (salt weight / total weight of salt and solvent)), 224.73 grams of NMP (N-methyl-2-pyrrolidone), and 11.846 grams (0.053 moles) of DAPBI, and 2.852 grams of PPD, and stirred 10 minutes. At this point DAPBI was not completely dissolved in the solvent system. The contents were stirred in an ice-water bath to cool the mixture to below 10°C. 16.093 grams (0.079 moles) of TCl (terephthaloyl dichloride) was added in one portion and stirred at a slow rate for 1 minute to mix the TCl evenly throughout the solution. As the viscosity of the solution increases rapidly over time, increase the stirrer speed to maximum. The solution became very viscous and gelled within about 4 minutes. The highly viscous reaction mixture was stirred for an additional 25 minutes. Tra...

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Abstract

The invention concerns processes for forming a polymer comprising residues of 2-(4-amino phenyl)-5 (6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine, and terephthaloyl dichloride, comprising the steps of: (a) forming a slurry of DAPBI and paraphenylene diamine in a solvent system comprising an organic solvent and an inorganic salt; and (b) adding a stoichiometric amount of terephthaloyl dichloride to the slurry in a single addition and allowing the formation of the polymer.

Description

technical field [0001] This patent application relates to a process for the preparation of aromatic polyamide polymers derived from 5(6)-amino-2-(p-aminophenyl)benzimidazole (DAPBI), p-phenylenediamine (PPD) and terephthaloyl dichloride (TCl), capable of forming fibers with excellent physical properties. Background technique [0002] Derived from 5(6)-amino-2-(p-aminophenyl)benzimidazole (DAPBI), p-phenylenediamine (PPD-T) and terephthaloyl dichloride (TCl or T, also commonly known as Terephthaloyl chloride) fibers are known in the art. Such copolymers are high-strength fibers made in Russia (for example, under the trade name and )Foundation. See Russian Patent Application 2,045,586. [0003] The two amines on DAPBI differ greatly in terms of reactivity and positional factors. The amine shown on the right side of the structure below (azole amine) is an order of magnitude more reactive than the amine on the left side of the structure (benzylamine). [0004] [000...

Claims

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Application Information

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IPC IPC(8): C08G69/32C08G73/18
CPCC08G73/18C08G69/32C08G69/00
Inventor K-S.李
Owner EI DU PONT DE NEMOURS & CO
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