Polysulfide-modified epoxy resins
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United States of America Patent
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May 28, 1996
Issued Date -
N/A
app pub date -
Dec 6, 1994
filing date -
Dec 19, 1991
priority date (Note) -
Expired
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Abstract
A polysulfide-modified epoxy resin system in which, upon curing, the polysulfide rubber phase separates into discrete particles, typically 1 to 5 .mu.m in size, to enhance physical properties such as peel strength without any significant reduction in glass transition temperature. The phase separation is brought about by using as a modifier a liquid polysulfide containing a high proportion of polymethylene groups of 4 to 12 carbon atoms. The polysulfide may be adducted with an excess of epoxy resin prior to incorporation in the composition.
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