Oxide-reduction method for prepn. of emulsion polymer with low monomer content

A technology for polymers and monomers, applied in the field of redox preparation of emulsion polymers with low residual monomer content, can solve problems such as less effective, lower total volatile organic compound content, lower content and the like

Inactive Publication Date: 2002-05-15
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, certain redox initiator systems are less effective for reducing monomer content, especially for specific monomers, and for reducing total volatile organic compound content, especially since certain water-insoluble oxidizing agents are susceptible to For use in aqueous emulsion polymerization, it must be supplied as a solution in a water-miscible solvent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The reduction of embodiment 1 residual monomer

[0059] The procedure of Comparative Example A was followed except that erythorbic acid was replaced by 0.23 g of 2-hydroxy-2-sulfinylacetic acid (50% by weight sodium salt of sulfinate; 0.0011 moles of reducing agent).

Embodiment 2

[0060] The reduction of embodiment 2 residual monomer

[0061] The procedure of Example 1 was followed except that 2 ppm copper (as a 0.1% solution in copper nitrate hemipentahydrate) was added to the emulsion polymer before the oxidizer and reducer additions began.

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Abstract

A process for preparing an aqueous emulsion polymer including providing at least one ethylenically unsaturated monomer and a free radical redox initiator system under emulsion polymerization conditions, the redox initiator system including a water-soluble oxidizing agent, a water-insoluble oxidizing agent, and a sulfinic acid, or salts thereof, reducing agent; and effecting the polymerization of at least some of the ethylenically unsaturated monomer is provided. Also provided is a process for reducing the residual ethylenically unsaturated monomer content of an aqueous emulsion polymer.

Description

field of invention [0001] The present invention relates to a redox process for preparing emulsion polymers with low residual monomer content. Suitably, the redox process provides an emulsion polymer having a low volatile organic compound content as well as a low residual monomer content. More particularly, the present invention relates to a process for preparing aqueous emulsion polymers comprising providing at least one ethylenically unsaturated monomer and a free radical redox initiator system under emulsion polymerization conditions, the redox initiator system comprising a water-soluble oxidizing agent, a water-insoluble oxidizing agent, and a reducing agent, sulfinic acid or a salt thereof; and polymerizing at least some ethylenically unsaturated monomers. The present invention also relates to a method of reducing the residual monomer content of emulsion polymers. Background technique [0002] Redox initiator systems comprising at least one oxidiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/22C08F2/16C08F4/40
CPCC08F6/006C08F4/40C08F2/22
Inventor S·C·布朗R·C·埃文
Owner ROHM & HAAS CO
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