Process for deinking electrostatic printed paper using a combination of non-ionic surfactants
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United States of America Patent
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Oct 1, 1996
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N/A
app pub date -
Apr 22, 1994
filing date -
Apr 22, 1994
priority date (Note) -
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Abstract
Describes a method for deinking wastepaper printed with electrostatic ink or mixtures thereof with wastepaper printed with impact ink in which a combination of nonionic surfactants are added to an alkaline slurry of the paper fibers. The surfactants are a first nonionic surfactant represented by the formula, R--Ph--(OC.sub.2 H.sub.4).sub.m --(OC.sub.3 H.sub.6).sub.n --(OC.sub.4 H.sub.8).sub.p --R.sup.1 and a second nonionic surfactant represented by R.sup.2 --(OC.sub.2 H.sub.4).sub.r --OH, R.sup.3 --(OC.sub.2 H.sub.4).sub.s --R.sup.4 or mixtures of such second nonionic surfactants. R contains 8 to 10 carbon atoms, Ph is phenylene, R.sup.1 is chloro or phenoxy, R.sup.2 contains 10 to 16 carbon atoms, R.sup.3 contains 8 to 14 carbon atoms, R.sup.4 is chloro, the sum of m, n and p is a number of from 1 to 10, r is a number of from 1 to 5 and s is a number of from 0.5 to 15. The ratio of the first to second nonionic surfactants is from 1:100 to 1:1.
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