Process for producing MEK-modified resorcin/formalin resin parallelly carrying out recovery and reuse of specified raw material
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United States of America Patent
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Aug 27, 2013
Grant Date -
Jan 21, 2010
app pub date -
Sep 27, 2007
filing date -
Sep 29, 2006
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Abstract
The present invention relates to a process for producing an MEK-modified resorcinol-formalin resin, in which recovery and reuse of the specific raw materials (water, calcium chloride, and methyl ethyl ketone (MEK)), and methanol contained in formalin, are carried out in parallel. Using this closed-system recycle production method, a resorcinol-formalin resin aqueous solution can be obtained, wherein the resin aqueous solution has a reaction product concentration of from 30 to 80%, moderate flowability with a pH of 6 to 10, a calcium chloride concentration of 100 ppm or less, a peak area corresponding to a resorcinol monomer of from 3 to 9% to the entire peak area obtained by gel permeation chromatography analysis, and a peak area corresponding to resorcinol pentanuclear or higher nuclear bodies of from 30 to 55% to the entire peak.
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