Bulk polymerization process for preparing solid acrylic resin
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United States of America Patent
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Dec 12, 2000
Issued Date -
N/A
app pub date -
Oct 10, 1997
filing date -
Jul 26, 1996
priority date (Note) -
Expired
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Abstract
Described is a process for making acrylic resins suitable as polymeric surfactants used in emulsion polymerization, as pigment grinding resins and for preparing dispersions used as overprint varnishes. The feedstock is styrene, .alpha.-methyl styrene, acrylic acid and a polymerization initiator and is preferably free of solvent. This mix is passed through a continuous tube reactor run at a controlled range of pressure and relatively low residence time and temperature. Optimally, when the polymer/unreacted monomers blend exits the reactor and is devolatilized, the recovered monomers are used to make up part of the feedstock.
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