# US 4,399,273 A · Process for the removal of residual monomers from ABS polymers

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- Number: US 4,399,273 A
- Document ID: US4399273A
- Status: Granted
- Kind: A
- Application number: 06/276,473
- Filed: 1981-06-23
- Granted: 1983-08-16
- Earliest claimed: 1979-03-10
- Assignees: Bayer Aktiengesellschaft
- Inventors: Gert Humme; Horst Plato; Karl-Heinz Ott; Friedrich Kowitz; Peter Hagenberg
- Web page: https://patentgrep.com/patent/US4399273A

## CPC

- C08F 6/003: {from polymer solutions, suspensions, dispersions or emulsions without recovery of the polymer therefrom}
- C08F 6/22: Coagulation
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Process for the removal of residual monomers from ABS polymers prepared by emulsion polymerization, wherein from 0.1 to 10% by weight, based on the solids content in the latex, of an electrolyte such as an acid or a salt are added to a latex containing an ABS polymer, and the mixture is at the same time heated to a temperature of from 55.degree. to 120.degree. C. while the residual monomer and part of the water are removed by distillation.

## Claims

### Claim 1

Process for recovering ABS polymers from a latex prepared by emulsion polymerization with simultaneous removal of residual monomers, which consisting essentially of:
(a) adding to the latex 0.1 to 10% by weight, based on the solids content, of an electrolyte selected from acids and salts,
(b) simultaneously heating the mixture to about 55.degree. to 120.degree. C. to cause coagulation, and
(c) then distilling off part of the water, together with the residual monomers thereby removing residual monomers.