Styrene copolymers in de-inking
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United States of America Patent
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Dec 3, 2002
Issued Date -
N/A
app pub date -
Jan 19, 2001
filing date -
Jan 19, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Provided herein are compositions of matter useful in de-inking secondary fibers. A composition according to the invention includes an aqueous solution of an anionic form of a styrene-methacrylic acid copolymer. When a surfactant is used in combination with the copolymers herein described in a de-inking operation, a synergy is observed in that the combination of copolymer and surfactant combination together yield a recycled fiber product having higher brightness level and a lower effective residual ink concentration than recycled fibers produced using either the copolymer or surfactant alone in the same operation.
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