Direct synthesis method for the production of etherified melamine resin condensates, melemine resin condensates, and use thereof
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United States of America Patent
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Issued Date -
Nov 9, 2006
app pub date -
Dec 18, 2003
filing date -
Dec 19, 2002
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Abandoned
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Abstract
The invention relates to a direct synthesis method for producing etherified melamine resin condensates having average molar masses of 500 to 50,000. The method is characterized by the fact that a) an etherified melamine resin precondensate is produced in an alcoholic solution in a first reaction step; b) the etherified melamine resin precondensate is concentrated in an alcoholic solution in at least one condensation step, C.sub.4 to C.sub.18 alcohols, diols of type HO--R--OH, and/or tetravalent alcohols that are based on erythritol being added to the melamine resin precondensate during and/or following the concentration process; c) the concentrated melamine resin precondensate is reacted by means of a mixer, especially a kneader, in a second reaction step.
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