Appeal 2007-1366
Application 90/005,090
1 F. 19. Tanaka notes the importance of oxygen permeability of contact lens
2 materials. Tanaka, 1:6-10.
3 F. 20. Tanaka notes that the utilization of comonomers having an alkylsiloxy
4 group is an available means of increasing oxygen permeability.
5 Tanaka, 2: 60-63.
6 F. 21. Tanaka describes methods of making crosslinked oxygen permeable
7 contact lens materials by copolymerization of certain specific
8 comonomers.
9 F. 22. Tanaka teaches that the copolymers may be crosslinked in a
10 conventional manner using a cross-linking agent added to the mixture
11 prior to polymerization. Tanaka, 2:30-31, 7: 59-8:2.
12 F. 23. Tanaka says cross-linking agents of the type conventionally used in
13 cross-linking vinyl monomers may be employed. Tanaka, 8: 2-10.
14 F. 24. Tanaka also teaches that multifunctional siloxyanyl alkyl ester cross-
15 linking agents may be substituted for the conventional cross-linking
16 agents conventionally used in polymerization of vinyl monomers.
17 Tanaka 8:2-10.
18 F. 25. Tanaka also teaches that the preferred cross-linking agents are
19 multifunctional monomers having siloxane bonds. Tanaka, 8:10-12.
20 F. 26. The preferred multifunctional monomers disclosed are multifunctional
21 siloxyanyl alkyl esters having a siloxane bond corresponding to
22 specified formulas referred to as Formulas [V] and [VI].
23 Tanaka, 8: 11-34.
24 F. 27. Tanaka says these are preferred because the siloxane bonds provide
25 high oxygen permeability to the cross-linked copolymer:
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