Process for forming an aramid copolymer

A technology of polymer and polymer solution, applied in the field of preparing aromatic polyamide polymer, can solve the problem of not allowing the preparation of aromatic polyamide polymer and the like

Active Publication Date: 2015-06-03
DUPONT SAFETY & CONSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The prior art does not allow the preparation of aramid polymers comprising DAPBI in high solids content reactions while obtaining polymers with high inherent viscosity

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

[0057] NMP, CaCl 2 , DAPBI, PPD and TCl were obtained from commercial sources.

example 1

[0059] Add 5.38% CaCl to the FM130D Littleford reactor 2 31.82 kg of NMP solvent ("c" value 5.38). Then 2180 g of DAPBI ("b" value 70) was added. The contents were then cooled to 10°C. 707 g of terephthaloyl chloride was added to form a prepolymer solution. The prepolymer solution was then cooled to 10°C, and 455 g of PPD ("y" value 30) was dissolved in the prepolymer mixture. Then 2122 g of terephthaloyl dichloride were added. The product of (b×c) of the polymer is equal to 377.

[0060] The reaction had 12% solids on a polymer basis and 14.7% solids on a total monomer basis. The final inherent viscosity was 6.5 dl / g.

example 2

[0068] Example 1 was repeated, however adding terephthaloyl dichloride to DAPBI in three additions. After each addition, the mixture was cooled to 10 °C. The result was a polymer solution and polymer similar to Example 1.

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Abstract

The invention concerns processes for forming polymer crumb comprising residues of 2-(4-amino phenyl)-5 (6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine (PPD), and terephthaloyl dichloride (TCl), comprising the steps of: i) forming a slurry of b mole percent DAPBI in a solvent system comprising organic solvent and c weight percent of an inorganic salt, wherein the inorganic salt is present in an amount of at least 5 weight present of the organic solvent; ii) contacting the slurry with a less than stoichiometric amount of terephthaloyl chloride to form an prepolymer solution; and iii) contacting the prepolymer solution with y mole percent of PPD and additional TCL to form a polymer solution; wherein the total amount of TCL added in steps ii) and iii) is a stoichiometric amount based on the total amount of DAPBI and PPD added in steps i) and iii); the DAPBI and PPD are added in an amount sufficient for providing a polymer solution having a weight percent solids of 12 percent or greater on a polymer basis; and wherein the sum of y+b is 100 and the product of b x c is 225 or greater.

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, also commonly known as terephthaloyl dichloride Acyl chloride) fibers are known in the art. Such copolymers are Russian-made high-strength fibers (for example under the trade name and )The basics. See Russian Patent Application 2,045,586. U.S. Patent 4,172,938 discloses a process for preparing aramid polymers using N-methyl-2-pyrrolidone (NMP) containing at least 1.5 but less than 5% by weight CaCl 2 solvent. [0003] The prior art does not allow the preparation of aramid polymers comprising DAPBI in high solids co...

Claims

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Application Information

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IPC IPC(8): C08G69/32C08G69/04C08G73/18
CPCC08G69/04C08G69/32C08G73/18
Inventor F.K.马伦
Owner DUPONT SAFETY & CONSTR INC
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