Appeal 2007-1366
Application 90/005,090
1 Since these cross-linking agents of the general formulas
2 [V] and [VI] have siloxane bonds in their molecules, the
3 oxygen permeability of the obtained cross-linked
4 copolymers is high and, therefore, they are preferably
5 employed in the present invention.
6 Tanaka, 8:35-39.
7 F. 28. One having ordinary skill in the art would have understood Tanaka to
8 teach that the preferred multifunctional siloxyanyl alkyl ester cross-
9 linking agents contribute to the oxygen permeability of the contact
10 lens material. Tanaka, 8:35-39.
11 Quaal
12 F. 29. Quaal relates to the formation of “tris-siloxy acrylic silanes,” having
13 the general formula (R3SiO)3Si-R’-OOCC(R”)=CH2.
14 F. 30. Quaal teaches a general method of forming these silanes by the
15 cohydrolysis of (1) compounds having the formula
16 CH2=C(R”)COO-R’-SiX3 with (2) an excess amount of compounds
17 represented by R3SiX. Quaal, 1:25-28.
18 F. 31. R, R’, R” and X are each defined as a variety of moieties.
19 Quaal, 1:16-36.
20 F. 32. TRIS, MAS and TMCS are compounds meeting Quaal’s general
21 formula and the formulas for the two reactants, respectively.
22 F. 33. TRIS has the formula ((CH3)3SiO)3Si-(CH2)3-OOCC(CH3)=CH2 and
23 meets Quaal’s definitions of R, R’ and R” where R is methyl (-CH3),
24 R’ is the alkylene -(CH2)3-, R” is methyl (-CH3).
25 F. 34. MAS has the formula CH2=C(CH3)COO-(CH2)3-Si(OCH3)3 and meets
26 Quaal’s definitions of R’, R” and X where R’is the alkylene -(CH2)3-,
27 R” is methyl (-CH3), and X is methoxy (-(OCH3)).
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