Appeal 2007-2739
Application 11/106,321
wherein the process is conducted in the substantial absence of
metal alkoxide or tin-containing compound.
Thus, claim 1 is directed to a process of making silylisocyanurate by
cracking silylorganocarbamate in the presence of a cracking catalyst – a
carboxylate salt of ammonium, an alkali metal, and/or an alkaline earth
metal – to produce a silylorganoisocyanate, and trimerizing the
silylorganoisocyanate in the presence of the cracking catalyst to yield the
silylisocyanurate. The process is conducted in the substantial absence of
metal alkoxides or tin-containing compounds.
2. PRIOR ART
The Examiner relies on the following references:
Berger US 3,598,852 Aug. 10, 1971
Barsa US 4,540,781 Sep. 10, 1985
Pepe US 5,218,133 Jun. 8, 1993
3. OBVIOUSNESS
Claims 1 and 3-20 stand rejected under 35 U.S.C. § 103 as obvious in
view of Pepe, Berger, and Barsa (Answer 3-5).
The Examiner cites Pepe as disclosing “a process for making
silylorganoisocyanurate which involves the cracking of the corresponding
silylorganocarbamate in presence of a cracking catalyst and a trimerization
catalyst wherein [the] cracking catalyst encompasses metal alkoxide and tin
carboxylates while the trimerization catalyst include[s] several alkali and
metal salts of organic acids” (id. at 3). The Examiner notes that Pepe’s
process uses the cracking and trimerization catalysts together without
isolating the silylorganoisocyanate intermediate, but concedes that claim 1
“differ[s] from Pepe et al. in avoiding the use of cracking catalyst but use[s]
3
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