Polymer composition for curing novolac resins
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United States of America Patent
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May 27, 2003
Grant Date -
Aug 15, 2002
app pub date -
Feb 4, 2000
filing date -
Feb 4, 2000
priority date (Note) -
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Abstract
A polymer composition that can be used to cure a novolac resin at a lower temperature than conventional curing agents and with reduced emission of volatile compounds is disclosed. The curing agent composition is prepared by mixing and reacting in aqueous solution a phenolic monomer and an aldehyde in the presence of a basic catalyst to form an intermediate resin, and reacting the intermediate resin with an amine to form the curing agent. The aldehyde to phenolic monomer molar ratio in the reaction should be at least about 1.0:1. The preferred amine is hexamethylenetetramine, and it is preferred that the hexamethylenetetramine to phenolic monomer molar ratio is at least about 0.12:1. The curing agent releases minimal volatile compounds when used to cure novolac resins, and unlike conventional resole curing agents, has an indefinite shelf life in both the pure form and when blended with a novolac resin.
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