Polymeric defoamer compositions
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United States of America Patent
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Oct 6, 1992
Grant Date -
N/A
app pub date -
Aug 27, 1990
filing date -
Aug 27, 1990
priority date (Note) -
Expired
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Abstract
Polymeric defoamer compositions are prepared from hydroxyalkylacrylate or methacrylate containing polymers which are then solubilized in an organic carrier system. The polymers are effective defoamers and drainage aids for brown stock washers, screen rooms, and in other paper-making operations. The compositions, which may be petroleum oil-free, avoid many of the deleterious effects of conventional petroleum oil-based EBS defoamers.
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