Manufacturing paper employing a polymer of acrylic or methacrylic acid
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United States of America Patent
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Jan 5, 1993
Issued Date -
N/A
app pub date -
May 13, 1991
filing date -
Jul 23, 1986
priority date (Note) -
Expired
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Abstract
The present invention relates to amphoteric water soluble polymers which contain a) 90 to 30%-wt acrylic acid and/or methacrylic acid b) 10 to 60%-wt of a compound of the formula ##STR1## wherein R.sub.1 stands for hydrogen or the methyl radical, R.sub.2 and R.sub.3, which are the same or different, stand for the methyl or ethyl radical, and an optionally branched alkaline radical with 1 to 5 C atoms stands for X and optionally, up to 50%-wt of acrylamidomethylpropane sulfonic acid and up to 10%-wt of a further ethylenically unsaturated compound, the molecular weight of these polymers, measured at a pH value of 8.0, being smaller than 100,000. The present invention also relates to the process for producing these polymers, and their use as grinding or dispersing agents for the production of highly concentrated aqueous pigment suspensions.
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