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Process for forming an aramid copolymer

A technology for polymers and products, applied in the field of preparing aromatic polyamide polymers, can solve the problems such as not allowing the preparation of aromatic polyamide polymers

Active Publication Date: 2014-06-11
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 intrinsic 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 1

[0071] Charge the FM130D Littleford reactor containing 5.38% CaCl 2 31.82 kg of NMP solvent ("c" value 5.38). Then 455 g of PPD ("y" value of 30) and 2180 g of DAPBI ("b" value of 70) were charged. The process was then cooled to 7°C. Three terephthaloyl dichloride additions were made: 998g, 997g and 834g. After the first addition, the mixture was cooled to 10°C and after the second addition, the mixture was cooled to 10°C. At the end of the reaction, the reactor was inspected for sediment and no large clumps of DAPBI were observed on the walls. The product of (b×c) is equal to 377.

[0072] The reaction had 12% solids on a polymer basis and 14.7% solids on a total monomer basis. The final intrinsic viscosity was 7.5. The final polymer had a polydispersity of about 1.5 and a <3000 MW oligomer content of about 0.45%.

example 2

[0077] Charge the FM130D Littleford reactor containing 5.91% CaCl 2 31.36 kg of NMP solvent ("c" value 5.91). Then 493 g of PPD ("y" value of 30) and 2382 g of DAPBI ("b" value of 70) were charged. The process was then cooled to 8°C. Three terephthaloyl dichloride additions were made: 772g, 773g and 1538g. After the first addition, the mixture was cooled to 1OC and after the second addition, the mixture was cooled to 11°C. At the end of the reaction, the reactor was inspected for sediment and no large clumps of DAPBI were observed on the walls. The product of (b×c) is equal to 414.

[0078] The reaction had 13% solids on a polymer basis and 16.0% solids on a monomer basis based on total monomer. The final intrinsic viscosity was 7.1.

example 3

[0080] The polymer was prepared by the method of Example 2, and the weight average molecular weight and number average molecular weight were obtained. The polymer has a PDI of less than 1.5.

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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, comprising the steps of: (a) forming a slurry of b mole percent DAPBI and y mole percent PPD 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 percent of the organic solvent, DAPBI and PPD being present in an amount sufficient for providing a polymer solution having a weight percent solids of 12 percent or greater on a polymer basis; and (b) contacting the slurry of step a) with a stoichiometric amount of terephthaloyl dichloride to form a product comprising the polymer; wherein the sum of y+b is 100, and the product of b*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 high-strength fibers made in Russia (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 a compound containing at least 1.5 but less than 5% by weight CaCl 2 Solvent in N-methyl-2-pyrrolidone (NMP). [0003] The prior art does not allow the preparation of aramid polymers comprising DAPBI ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/32C08G73/18
CPCC08G69/00C08G69/28C08G73/18C08G69/32
Inventor F.K.马尔龙
Owner DUPONT SAFETY & CONSTR INC
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