Appeal 2007-3191
Application 10/482,217
RELEVANT FINDINGS OF FACT
1) Liao discloses flame retardant resin molding compositions.
2) Liao’s compositions include a polyester resin component (Liao,
col. 2, l. 8). According to Liao, the most preferred polyesters are
poly(ethylene terephthalate) ("PET"), and poly(1,4-butylene
terephthalate), ("PBT"), poly(ethylene naphthanoate) ("PEN"),
poly(butylene naphthanoate), ("PBN") and (polypropylene terephthalate)
("PPT"), and mixtures thereof (Liao, col. 2, ll. 49-54).
3) According to Liao, preferred blends of polyesters include blends
that incorporate PBT and PET (Liao, col. 2, ll. 54-55). “When blends of
these preferred components are employed the polyester resin component
can comprise from about 1 to about 99 parts by weight poly(ethylene
terephthalate) and from about 99 to about 1 part by weight poly(1,4-
butylene terephthalate) based on 100 parts by weight of both
components combined” (Liao, col. 3, ll. 20-27).
4) Liao discloses the use of a flame retardant in combination with a
synergist, typically inorganic antimony compounds (Liao, col. 11, l. 4).
According to Liao, the flame-retardant additive should be present in an
amount at least sufficient to reduce the flammability of the polyester
resin. In general, the amount of additive will be from 2 to 20 percent by
weight based on the weight of resin, with a preferred range from about 5
to 15 percent (Liao, col. 10, ll. 38-45). Liao states that synergists, such
as antimony oxides, are typically used at about 0.5 to 15 percent, and
more preferably from 1 to 6 percent by weight based on the weight
percent of resin in the final composition (Liao, col. 11, ll. 0-12).
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Last modified: September 9, 2013