Process for deinking electrostatic printed paper using a combination of non-ionic surfactants
First Claim
1. A method for deinking printed paper selected from the group consisting of electrostatically printed paper and a mixture of electrostatically printed paper and impact ink printed paper comprising the steps of:
- (a) pulping such printed paper in an alkaline aqueous medium, thereby to produce an aqueous slurry of paper fibers and particles of electrostatic ink,(b) adding to said slurry with agitation a deinking amount of deinking agent comprising, in combination,(i) a first nonionic surfactant material represented by the formula;
space="preserve" listing-type="equation">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.1wherein R is an aliphatic hydrocarbon group containing from about 8 to 10 carbon atoms, Ph is the bivalent phenylene group, R1 is selected from the group consisting of chloro and phenoxy, m, n, and p are each a number of between 0 and about 10, provided that the sum of m, n, and p is a number between about 1 and 10; and
(ii) a second deinking nonionic surfactant material selected from the group consisting of;
a) a nonionic surfactant represented by the formula, R2 --(OC2 H4)r --OH, wherein R2 is an aliphatic hydrocarbon group containing from about 10 to about 16 carbon atoms and r is a number of between about 1 and about 5;
b) a nonionic surfactant represented by the formula, R3 --(OC2 H4)s --R4, wherein R3 is an aliphatic hydrocarbon group containing from about 8 to about 14 carbon atoms, R4 chloro and s is a number of between about 0.5 and about 15; and
c) mixtures of said second nonionic surfactants wherein the ratio of said first nonionic surfactant material (i) to the second nonionic surfactant material (ii) being from about 1;
100 to about 1;
1,(c) agitating the slurry of step (b) to agglomerate the particles of electrostatic ink, and(d) separating the agglomerated electrostatic ink particles form the aqueous slurry of paper fibers.
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Accused Products
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
H8)p --R1
and a second nonionic surfactant represented by R2 --(OC2 H4)r --OH, R3 --(OC2 H4)s --R4 or mixtures of such second nonionic surfactants. R contains 8 to 10 carbon atoms, Ph is phenylene, R1 is chloro or phenoxy, R2 contains 10 to 16 carbon atoms, R3 contains 8 to 14 carbon atoms, R4 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.
20 Citations
14 Claims
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1. A method for deinking printed paper selected from the group consisting of electrostatically printed paper and a mixture of electrostatically printed paper and impact ink printed paper comprising the steps of:
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(a) pulping such printed paper in an alkaline aqueous medium, thereby to produce an aqueous slurry of paper fibers and particles of electrostatic ink, (b) adding to said slurry with agitation a deinking amount of deinking agent comprising, in combination, (i) a first nonionic surfactant material represented by the formula;
space="preserve" listing-type="equation">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.1wherein R is an aliphatic hydrocarbon group containing from about 8 to 10 carbon atoms, Ph is the bivalent phenylene group, R1 is selected from the group consisting of chloro and phenoxy, m, n, and p are each a number of between 0 and about 10, provided that the sum of m, n, and p is a number between about 1 and 10; and (ii) a second deinking nonionic surfactant material selected from the group consisting of; a) a nonionic surfactant represented by the formula, R2 --(OC2 H4)r --OH, wherein R2 is an aliphatic hydrocarbon group containing from about 10 to about 16 carbon atoms and r is a number of between about 1 and about 5; b) a nonionic surfactant represented by the formula, R3 --(OC2 H4)s --R4, wherein R3 is an aliphatic hydrocarbon group containing from about 8 to about 14 carbon atoms, R4 chloro and s is a number of between about 0.5 and about 15; and c) mixtures of said second nonionic surfactants wherein the ratio of said first nonionic surfactant material (i) to the second nonionic surfactant material (ii) being from about 1;
100 to about 1;
1,(c) agitating the slurry of step (b) to agglomerate the particles of electrostatic ink, and (d) separating the agglomerated electrostatic ink particles form the aqueous slurry of paper fibers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification