Method for treating mixtures containing photopolymeric resin and compositions therefor
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United States of America Patent
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Jul 26, 1988
Grant Date -
N/A
app pub date -
Aug 1, 1986
filing date -
Aug 1, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for treating an aqueous alkaline spent mixture produced during preparation of circuit boards and comprising a photopolymer resin. According to the method, first, an acid, a polyvalent cation and a coagulation aid are mixed with the spent mixture to produce a heterogeneous treated mixture comprising coagulated, precipitated photopolymer resin and an aqueous phase. Then, the coagulated, precipitated photopolymer resin is separated from the aqueous phase to produce a non-tacky, non-gumlike photopolymer resin sludge.
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