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
Comparison scheme
Effect test

example

[0062] NMP, DMAC, LiCl, CaCl 2 , DAPBI, PPD and TCl were obtained from commercial sources.

example 1

[0064] Add 104.64 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)), 177.09 grams of NMP (N-methyl-2-pyrrolidone), and 2.539 grams (0.023 moles) of PPD (p-phenylenediamine), and Stir for 10 minutes. The contents were stirred in an ice-water bath to cool the mixture to below 10°C. Add 9.536 g (0.047 mol) TCl in one portion and stir for 5 minutes. The ice water bath was removed and 12.288 grams (0.055 moles) of DAPBI were added and stirred. The solution became very viscous and gelled within about 4 minutes. The highly viscous reaction mixture was stirred for an additional 25 minutes. Transfer the resulting polymer to blender and ground into small particles, then washed several times to remove solvent (NMP / CaCl 2 ) and excess HCl produced by the reaction. The polymer was then neutralized with sodium bicarbonate and finally washed several times with water to obtain a ne...

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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, the process comprising: (a) forming a solution of oligomers having chloride end groups from one mole of paraphenylene diamine and 1.3 to 5 moles of terephthaloyl dichloride a solvent system comprising an organic solvent and an inorganic salt; and (b) adding DAPBI and terephthaloyl dichloride to the solution of oligomers 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 with )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
CPCC08G73/18C08G69/04C08G69/32
Inventor K-S.李
Owner DUPONT SAFETY & CONSTR INC
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