# US 11,078,331 B2 · Acid neutralizing polymer materal and method of making same

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- Number: US 11,078,331 B2
- Document ID: US11078331B2
- Status: Granted
- Kind: B2
- Application number: 16/376,669
- Filed: 2019-04-05
- Published: 2019-10-10
- Granted: 2021-08-03
- Earliest claimed: 2018-04-06
- Assignees: Workers First LLC; Clarkson University
- Applicants: Workers First LLC
- Inventors: Matthew James Borowiak, Jr.; Richard Earl Partch
- Web page: https://patentgrep.com/patent/US11078331B2

## CPC

- C08G 69/48: Polymers modified by chemical after-treatment
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A method of preparing an acid reactive functionalized polyamide includes preparing a first reaction product by contacting and reacting virgin polyamide fabric material with tert-butoxide in a first aliquot of a polar aprotic solvent and preparing a second reaction product by adding an amine to a second aliquot of the polar aprotic solvent. A third reaction product is prepared by mixing the first reaction product and the second reaction product where the third reaction product is the acid reactive functionalized polyamide. The preparation of each respective reaction product is for a period of time and at a temperature sufficient to produce the respective reaction product.

## Claims

### Claim 1

A method of preparing an acid neutralizing polyamide, comprising:
a) preparing a first reaction product by contacting and reacting virgin polyamide fabric material with tert-butoxide in a first aliquot of a polar aprotic solvent;
b) preparing a mixture of 2-chloro-N, N-dimethylamine and a second aliquot of the polar aprotic solvent; and
c) preparing a second reaction product being the acid neutralizing polyamide by mixing the first reaction product and the mixture,
wherein each of steps a) and c) is for a period of time and at a temperature sufficient to produce the respective first and second reaction products.

### Claim 2 (depends on 1)

The method of claim 1 wherein the virgin polyamide fabric material comprises nylon 6 or nylon 66.

### Claim 3 (depends on 1)

The method of claim 1 wherein the polar aprotic solvent is either dimethyl sulfoxide (DMSO) or dimethylformamide (DMF).

### Claim 4 (depends on 1)

The method of claim 1 wherein the first reaction product is prepared under stirring at room temperature for at least 1 hour.

### Claim 5 (depends on 1)

The method of claim 1 wherein the the mixture of step b) is prepared under stirring at room temperature for at least 2 hours.

### Claim 6 (depends on 1)

The method of claim 1 wherein the third second reaction product is prepared under stirring at room temperature for at least 12 hours.

### Claim 7 (depends on 1)

The method of claim 1 further comprising the step of:
d) following the preparation step c), washing the second reaction product sequentially with the polar aprotic solvent, tetrahydrofuran (THF) and water.

### Claim 8 (depends on 1)

An acid neutralizing polyamide fabric material produced according to the method of claim 1.