Appeal 20072907
Application 10644791
antimony as unsafe. Similarly, Saito notes that commonly used phosphoric
acid compounds cause problems.21 Saito solves the problem of replacing
these materials by using molybdenum or tungsten oxides instead.22 Saito
also recommends the use of a compound of melamine and isocyanuric acid
to assist in retarding flames.23
The Yamaguchi publication
Yamaguchi discloses a flame-retardant epoxy resin.24 Yamaguchi too
notes the disadvantages of using bromine and antimony as fire retardants,25
and considers its resin to be safer because the resin is free of halogens and
antimony.26 The problem is solved using an organic flame retardant as the
principal flame retardant.27 Yamaguchi prefers nitrogen or phosphorous
compounds, particularly heterocyclic compounds, specifically including
melamine, cyanuric acid, isocyanuric acid, and melamine cyanurate.28 Note
that Yamaguchi illustrates melamine cyanurate as an ionic composition with
a melamine moiety and an isocyanurate moiety. Other fire retardants,
including metal oxides, may also be used.29
21 Saito ¶¶0003-0005.
22 Saito ¶0006.
23 Saito ¶0014.
24 Yamaguchi ¶0001.
25 Yamaguchi ¶0002.
26 Yamaguchi ¶0042.
27 Yamaguchi ¶0005.
28 Yamaguchi ¶¶0016-0020.
29 Yamaguchi ¶0022.
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