Method for reducing odoriferous and/or toxic residual monomer in a latex

Patent metadata

Field	Value
Publication number	US-9512241-B2
Application number	US-201114353409-A
Country	US
Kind code	B2
Filing date	Oct 24, 2011
Priority date	Oct 24, 2011
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

The present invention relates to a new and efficient toxicity and/or odor reducing method for ethyl acrylate and/or acrylonitrile contained aqueous polymer dispersion.

First claim

The invention claimed is:

1. A method for reducing residual ethyl acrylate, acrylonitrile, or the combination thereof, comprising contacting an ethyl acrylate/acrylonitrile scavenging compound selected from the group consisting of bisulfite salts, sulfite salts, mercaptan carboxylic acids or salts thereof, high boiling point water soluble alkamines, amino acids, and a combination thereof with a stable aqueous dispersion of a polymer to form a polymeric dispersion that contains less than 1 ppm of ethyl acrylate and less than 1 ppm acrylonitrile; wherein the polymer contains a) polymerized units of acrylonitrile, ethyl acrylate, or the combination thereof, and b) at least 5 ppm of ethyl acrylate monomer, acrylonitrile monomer, or the combination thereof; and wherein the ethyl acrylate/acrylonitrile scavenging compound are contacted with the aqueous dispersion of the polymer independently from contact of the aqueous dispersion of the polymer with any redox pairs;
wherein the aqueous dispersion of the polymer comprises 0.01 wt % to 5 wt % of ethyl acrylate/acrylonitrile scavenging compound, based on the dry weight of the aqueous dispersion of the polymer.

2. The method according to claim 1 wherein prior to, concurrent with, or subsequent to contacting the ethyl acrylate/acrylonitrile scavenging compound with the aqueous dispersion of the polymer, one or more redox pairs are contacted with the aqueous dispersion of the polymer.

3. The method according to claim 1 wherein no redox pair is contacted with the aqueous dispersion of the polymer.

4. The method according to claim 1 wherein the ethyl acrylate/acrylonitrile scavenging compound is a bisulfite salt or a sulfite salt.

5. The method according to claim 4 wherein the bisulfite salt is ammonium bisulfite, sodium bisulfite, or potassium bisulfite; and the sulfite salt is ammonium sulfite, sodium sulfite, or potassium sulfite.

Assignees

• Zhang Tingke
• Chen Jitao
• Li Minghe
• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Zhang Tingke
• Chen Jitao
• Li Minghe

Classifications

• C09D133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08L2201/54

  Aqueous solutions or dispersions · CPC title

• C08F6/006 Primary

  Removal of residual monomers by chemical reaction, e.g. scavenging · CPC title

• C08L33/20

  Homopolymers or copolymers of acrylonitrile (C08L55/02 takes precedence) · CPC title

• C08K5/14

  Peroxides · CPC title