Appeal No. 95-1496
Application No. 08/076,615
(ii) a diorganopolysiloxane polymer, each terminal group thereof containing
at least two silicon-bonded alkoxy radicals having 1-4 carbon atoms, said polymer
having a viscosity at 25°C of 20 to <100,000 centipoise, and the weight ratio of
said resin to said polymer being in the range 40:60 to 80:20;
(iii) a silane of the formula R’ SiX , in which R’ is selected from the group
4-y y
consisting of hydrocarbon radicals and substituted hydrocarbon radicals having 1-
6 carbon atoms, X is a hydrolyzable group and y is 2 to 4, the amount of said
silane being sufficient to provide stability to said composition; and
(iv) sufficient catalyst to accelerate the cure of said composition, said
composition being an essentially solvent-free, non-slump solid at room temperature
which cures to an essentially non-tacky elastomer upon exposure to moisture.
Applicants’ Brief, p. 12.
As can be seen from the claim, the composition must include four components: (i) a solid hydroxyl-
functional organopolysiloxane resin; (ii) a diorganopolysiloxane polymer; (iii) a silane; and (iv) a catalyst.
Applicants define the diorganopolysiloxane polymer (component (ii)) as follows:
The repeat units of the diorganopolysiloxane (ii) are R SiO siloxy units wherein
2 2/2
R is independently selected from the same hydrocarbon and halogenated
hydrocarbon radicals delineated above for component (i).
Specification, p. 9. Applicants define “R” to be limited to hydrocarbon or halogenated hydrocarbon.
Thus, their specification says R is
a monovalent radical selected from the group consisting of hydrocarbon and
halogenated hydrocarbon radicals, preferably having less than 20 carbon atoms,
and most preferably having from 1 to 10 carbon atoms. Examples of suitable R
radicals include alkyl radicals, such as methyl, ethyl, propyl, pentyl, octyl, undecyl
and octadecyl; cycloaliphatic radicals, such as cyclohexyl; aryl radicals such as
phenyl, tolyl, xylyl, benzyl, alpha-methyl styryl and 2-phenylethyl; alkenyl radicals
such as vinyl; and chlorinated hydrocarbon radicals such as 3-chloropropyl and
dichlorophenyl.
Specification, p. 6.
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