# US 8,541,539 B2 · Method for preparing a water-soluble polyamide

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- Number: US 8,541,539 B2
- Document ID: US8541539B2
- Status: Granted
- Kind: B2
- Application number: 12/345,171
- Filed: 2008-12-29
- Published: 2010-06-17
- Granted: 2013-09-24
- Earliest claimed: 2008-12-16
- Assignees: Taiwan Textile Research Institute
- Applicants: Yu-Chi Tseng; Chin-Wen Chen; S-P Rwei
- Inventors: Yu-Chi Tseng; Chin-Wen Chen; S-P Rwei
- Web page: https://patentgrep.com/patent/US8541539B2

## CPC

- H01B 1/24: the conductive material comprising carbon-silicon compounds, carbon or silicon
- C08G 69/36: derived from amino acids, polyamines and polycarboxylic acids
- C08G 69/42: Polyamides containing atoms other than carbon, hydrogen, oxygen, and nitrogen (C08G69/12, C08G69/32 take precedence)
- C08J 3/212: {and solid additives}
- C08J 3/226: {using a polymer as a carrier}
- C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence)
- D01F 1/09: for making electroconductive or anti-static filaments
- D01F 6/80: from copolyamides
- C08J 2377/00: Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J 2477/00: Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- Y10T 428/249921: Web or sheet containing structurally defined element or component
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method for preparing a water-soluble polyamide, includes copolymerizing reactive monomers including caprolactam; ethylene glycol bis(2-aminoethyl)ether or ethylene glycol bis(3-aminopropyl)ether; and 5-sulfoisophthalic acid monosodium salt, wherein a molar ratio of caprolactam:ethylene glycol bis(2-aminoethyl)ether or ethylene glycol bis(3 -aminopropyl)ether:5-sulfoisophthalic acid monosodium salt is about 0:1:1 to about 5:1:1, advantageously about 1.85:1:1. Copolymerizing takes place at a copolymerization temperature of about 222-250° C. and a copolymerization pressure of about 3 Bar. The method further includes maintaining a temperature of about 222-250° C. for about 2-3 hours under normal pressure after the copolymerization step. The water-soluble polyamide has a solubility in water of about 10-70%.

## Claims

### Claim 1

A method for preparing a water-soluble polyamide, comprising the steps of:
copolymerizing reactive monomers including:
caprolactam;
ethylene glycol bis(2-aminoethyl)ether or ethylene glycol bis(3-aminopropyl)ether; and
5-sulfoisophthalic acid monosodium salt,
wherein the reactive monomers have a molar ratio of caprolactam:ethylene glycol bis(2-aminoethyl)ether or ethylene glycol bis(3-aminopropyl)ether:5-sulfoisophthalic acid monosodium salt is about 0:1:1 to about 5:1:1, and
wherein the reactive monomers have a molar ratio of sulphonate group to carboxyl group is 0.5.

### Claim 2 (depends on 1)

The method for preparing a water-soluble polyamide of claim 1, wherein copolymerizing takes place at a copolymerization temperature of about 222-250° C. and a copolymerization pressure of about 3 Bar.

### Claim 3 (depends on 2)

The method for preparing a water-soluble polyamide of claim 2, further comprising maintaining a temperature of about 222-250° C. for about 2-3 hours under normal pressure after the copolymerization step.

### Claim 4 (depends on 1)

The method for preparing a water-soluble polyamide of claim 1, wherein the molar ratio of caprolactam:ethylene glycol bis(2-aminoethyl)ether or ethylene glycol bis(3-aminopropyl)ether:5-sulfoisophthalic acid monosodium salt is about 1.85:1:1.

### Claim 5 (depends on 1)

The method for preparing a water-soluble polyamide of claim 1, wherein the water-soluble polyamide has a solubility in water of about 10-70%.

### Claim 6

A method for preparing a carbon black-containing polyamide masterbatch composition, comprising: (a) preparing a water-soluble polyamide by copolymerizing reactive monomers including: caprolactam; ethylene glycol bis(2-aminoethyl)ether or ethylene glycol bis(3-aminopropyl)ether; and 5-sulfoisophthalic acid monosodium salt, wherein the reactive monomers have a molar ratio of caprolactam:ethylene glycol bis(2-aminoethyl)ether or ethylene glycol bis(3-aminopropyl)ether: 5-sulfoisophthalic acid monosodium salt is about 0:1:1 to about 5:1:1, and wherein the reactive monomers have a molar ratio of sulphonate group to carboxyl group is 0.5; (b) adding the water-soluble polyamide and carbon black into a solvent and dispersing the carbon black in the solvent to obtain a carbon black dispersion; (c) drying the carbon black dispersion to obtain an admixture, wherein the admixture comprises the dispersed carbon black and the water-soluble polyamide; (d) compounding a polyamide with the admixture to obtain the carbon black-containing polyamide masterbatch composition.

### Claim 7 (depends on 6)

The method for preparing a carbon black-containing polyamide masterbatch composition of claim 6, wherein a weight ratio of the water-soluble polyamide to the carbon black is about 1:1 to about 1:5.

### Claim 8 (depends on 6)

The method for preparing a carbon black-containing polyamide masterbatch composition of claim 6, wherein a weight ratio of the admixture to the polyamide is about 0.06:1 to about 4:1.

### Claim 9 (depends on 6)

The method for preparing a carbon black-containing polyamide masterbatch composition of claim 6, wherein the polyamide is nylon 6, nylon 11, nylon 12, nylon 46 or nylon 66.

### Claim 10 (depends on 6)

The method for preparing a carbon black-containing polyamide masterbatch composition of claim 6, wherein the solvent is water.