# US 4,396,740 A · Scavenging of residual acrylonitrile monomer in ABS latex

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,396,740 A
- Document ID: US4396740A
- Status: Granted
- Kind: A
- Application number: 06/374,117
- Filed: 1982-05-03
- Granted: 1983-08-02
- Earliest claimed: 1982-05-03
- Assignees: Borg-Warner Chemicals, Inc.
- Inventors: Mary E. Wozny
- Web page: https://patentgrep.com/patent/US4396740A

## CPC

- C08F 6/006: {Removal of residual monomers by chemical reaction, e.g. scavenging}
- C08C 1/04: Purifying; Deproteinising
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08C: TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS

## Abstract

The addition of aryl methanamines such as m-xylylenediamine to polymer latices which contain residual acrylonitrile monomer is markedly effective in reducing the measurable free acrylonitrile contents of latices.

## Claims

### Claim 1

A process for reducing the residual acrylonitrile monomer in an aqueous medium containing said monomer comprising adding to said medium an aryl methanamine.

### Claim 2 (depends on 1)

The process of claim 1 wherein said arylmethanamine is selected from the group consisting of benzylamine, xylylenediamine, mesitylylenetriamine and mixtures thereof.

### Claim 3 (depends on 1)

The process of claim 1 wherein the amount of aryl methanamine employed is at least 0.2 m per mole of acrylonitrile present in the medium.

### Claim 4 (depends on 1)

The process of claim 1 wherein the medium is an aqueous dispersion of an acrylonitrile polymer.

### Claim 5

A process for reducing the residual acrylonitrile monomer in an aqueous dispersion of an acrylonitrile polymer comprising adding to said medium at least 0.2 mole of an aryl methanamine per m of residual acrylonitrile monomer.

### Claim 6 (depends on 5)

The process of claim 5 wherein the aryl methanamine is selected from the group consisting of benzylamine, xylylenediamine, mesitylylenetriamine and mixtures thereof.

### Claim 7 (depends on 5)

The process of claim 5 wherein the aryl methanamine is m-xylylenediamine.