Method of deinking
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United States of America Patent
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Issued Date -
May 18, 2006
app pub date -
Jul 22, 2003
filing date -
Jul 24, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of deinking printed paper comprises pulping the paper to form an aqueous slurry, adding a deinking additive to the paper, and removing detached ink by flotation, wherein the additive comprises an organo-modified siloxane comprising units of the formula: [R.sup.1.sub.aZ.sub.bSiO.sub.(4-a-b)/2].sub.n in which each R.sup.1 is independently selected from a hydrogen atom, an alkyl, aryl, alkenyl, aralkyl, alkaryl, alkoxy, alkanoyloxy, hydroxyl, ester or ether group; each Z is independently selected from an alkyl group substituted with an amine, amide, carboxyl, ester, or epoxy group, or a group --R.sup.2--(OC.sub.PH.sub.2P).sub.q (OC.sub.rH.sub.2r).sub.s--R.sup.3; n is an integer greater than 1; a and b are independently 0, 1, 2 or 3; R.sup.2 is an alkylene group or a direct bond; R.sup.3 is a group as defined for R.sup.1 or Z above; p and r are independently an integer from 1 to 6; q and s are independently 0 or an integer such that 1.ltoreq.q+s.gtoreq.400; and wherein each molecule of the organo-modified siloxane contains at least one group Z.
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