Process for forming an aramid copolymer

A technology of polymers and oligomers, which is applied in the field of preparing aromatic polyamide polymers, and can solve problems such as the control of the position of monomer components that do not have

Active Publication Date: 2014-04-30
DUPONT SAFETY & CONSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, by the conventional polymerization method, in NMP/CaCl 2 DAPBI/PPD copolymers

Method used

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  • Process for forming an aramid copolymer
  • Process for forming an aramid copolymer
  • Process for forming an aramid copolymer

Examples

Experimental program
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example

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

example 1

[0067] This example shows the preparation of a DAPBI / PPD-T copolymer with a controlled "head-to-tail" DAPBI arrangement. DAPBI [5(6)-amino-2-(p-aminophenyl)benzimidazole] has two amine groups with very different reactivity, so-called unsymmetrical diamines. An amino group attached to a benzene ring with a fused imidazole ring reacts an order of magnitude faster than an amino group on a separate benzene ring on the opposite side of the molecule. The head and tail in this example represent faster / slower reacting amines, respectively; ie the "head" is benzylamine and the "tail" is azole amine.

[0068] polymer preparation :

[0069] Add 83.75 g of NMP / CaCl to a 1 L reactor equipped with frame stirrer and nitrogen inlet / outlet 2 Premix (8.3% by weight (salt weight / total weight of salt and solvent)), 163.30 g NMP (N-methyl-2-pyrrolidone], and 12.288 g (0.055 mole) DAPBI, and stirred for 10 minutes. At this point DAPBI Not completely dissolved in solvent system. Stir contents i...

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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 (PPD), and terephthaloyl dichloride, comprising the steps of: (a) forming a solution of oligomers having amine end groups from two moles of DAPBI and one mole of terephthaloyl dichloride in a solvent system comprising an organic solvent and an inorganic salt; (b) adding PPD to the solution of oligomers; and (c) adding additional terephthaloyl dichloride to form a 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) and terephthaloyl dichloride (TCl or T, also commonly known as p-phenylene Diformyl 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] ...

Claims

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Application Information

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IPC IPC(8): C08G69/32C08G73/18
CPCC08G73/18C08K5/20C08G69/48C08K3/30C08G69/32
Inventor K-S.李
Owner DUPONT SAFETY & CONSTR INC
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