Semi continuously operated method for producing copolymers
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United States of America Patent
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Sep 17, 2013
Grant Date -
Jan 5, 2012
app pub date -
Nov 25, 2009
filing date -
Dec 8, 2008
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Abstract
A process for the preparation of a copolymer in semicontinuous operation in a polymerization apparatus, comprising a polymerization reactor connected to a metering device, acid monomer being initially taken in the metering device and polyether macromonomer, acid monomer and water in the polymerization reactor, acid monomer being metered from the metering device into the polymerization reactor, the metering of the acid monomer being effected with the proviso that at least 70 mol % of the acid monomer metered in altogether are metered in the course of 5 to 19 minutes at a metering rate that is constant or varies to a limited extent.
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