Appeal 2007-1366
Application 90/005,090
1 1. A method of making an oxygen permeable material for
2 the manufacture of contact lens by the synthesization of the
3 monomer 1,1,1 tris(methylsiloxy)methacryloxypropylsilane (a
4 siloxanyl alkyl ester) by the following procedures:
5 (a) a mixture is prepared having the relationship of
6 one mole of methacryloxypropyltrimethoxysilane with
7 three to forty moles of trimethylchlorosilane;
8 (b) the mixture is then added to water whose volume
9 is from 3 to 10 times that of the mixture;
10 (c) agitation is maintained for 30 minutes to 48 hours;
11 (d) then allow the mixture to separate into layers,
12 remove and filter the upper organic layer;
13 (e) the unwanted by-product (hexamethyldisilane) is
14 then removed by vacuum distillation;
15 (f) forming an oxygen permeable contact lens material
16 by copolymerizing from
17 5% to 90% by weight of the 1,1,1 -
18 tris(trimethylsiloxy)methacryloxy-
19 propylsilane prepared above;
20 3% to 90% by weight of an ester of acrylic or
21 methacrylic acid;
22 from 0.05% to 90% by weight of a surface wetting
23 agent,
24 from 0.01% to 90% by weight of an oxygen
25 permeable crosslinking agent selected from
26 the class of multifunctional siloxanyl alkyl
27 esters
28 in the presence of a free radical or a photo initiator.
29 Gaylord
30 F. 8. Gaylord relates to methods of making oxygen permeable contact lens
31 materials.
32 F. 9. Gaylord teaches forming a contact lens material by copolymerizing
33 specified comonomers in the presence of a free radical initiator.
34 Gaylord, 1:52-56, 4:32-38
35 F. 10. The comonomers may include
- 3 -
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Next
Last modified: September 9, 2013