US4332922A
Expired / Lapsed
US
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Process for rendering silicone rubber contact lenses hydrophilic
Assignee: Ciba Vision GmbH
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Filing: 1980-07-18
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Granted: 1982-06-01
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Expires: 2000-07-18
Abstract
Abstract Process for rendering silicone rubber contact lenses hydrophilic by first reacting the silicone rubber with an oligomeric siloxane containing SiH groups in the presence of a catalyst and then subjecting the resulting equilibrated silicone rubber to a reaction with an aqueous base; or a silane addition reaction with a reactant containing C═C double bonds.
Inventors
- 👤 Gerhard Kossmehl
- 👤 Dietrich Quast
- 👤 Horst Schafer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:42
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/38; B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00038; C08G77/06; C08G77/10; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
85 words
Process for rendering silicone rubber contact lenses hydrophilic, which process comprises, as a first step, reacting the silicone rubber with an oligomeric siloxane containing SiH groups in the presence of a catalyst and a solvent which is a weak swelling agent for the silicone rubber and, in a second step, subjecting the resulting equilibrated silicone rubber to (i) a reaction with an aqueous base in the presence of an alkali metal hydroxide; or (ii) a silane addition reaction with a reactant containing C═C double bonds.
Claim 2
Dependent Claim
85 words
Process for rendering silicone rubber contact lenses hydrophilic, which process comprises, as a first step, reacting the silicone rubber with an oligomeric siloxane containing SiH groups in the presence of a catalyst and a solvent which is a weak swelling agent for the silicone rubber and, in a second step, subjecting the resulting equilibrated silicone rubber to (i) a reaction with an aqueous base in the presence of an alkali metal hydroxide; or (ii) a silane addition reaction with a reactant containing C═C double bonds.
Claim 3
Dependent Claim
33 words
Process as claimed in claim 1 wherein the reactant used in the first step of the process is an oligomeric linear methyl hydrogen siloxane of 5 to 50 Si atoms in a chain.
Claim 4
Dependent Claim
33 words
Process as claimed in claim 1 wherein the reactant used in the first step of the process is an oligomeric linear methyl hydrogen siloxane of 8 to 12 Si atoms in a chain.
Claim 5
Dependent Claim
31 words
Process as claimed in claim 1 wherein the reactant used in the first step of the process is an oligomeric linear methyl hydrogen siloxane of 10 Si atoms in a chain.
Claim 6
Dependent Claim
35 words
Process as claimed in claim 1 wherein the reactant used in the first step of the process is a mixture of oligomeric linear methyl hydrogen siloxanes of 5 to 50 Si atoms in a chain.
Claim 7
Dependent Claim
33 words
Process as claimed in claim 1 wherein the reactant used in the first step of the process is an oligomeric cyclic methyl hydrogen siloxane with 3 to 11 Si atoms in a ring.
Claim 8
Dependent Claim
33 words
Process as claimed in claim 1 wherein the reactant used in the first step of the process is an oligomeric cyclic methyl hydrogen siloxane with 6 to 10 Si atoms in a ring.
Claim 9
Dependent Claim
33 words
Process as claimed in claim 1 wherein the reactant used in the first step of the process is an oligomeric cyclic methyl hydrogen siloxane with 7 to 10 Si atoms in a ring.
Claim 10
Dependent Claim
35 words
Process as claimed in claim 1 wherein the reactant used in the first step of the process is a mixture of oligomeric cyclic methyl hydrogen siloxanes of 3 to 11 Si atoms in a ring.
Claim 11
Dependent Claim
18 words
Process as claimed in claim 1 wherein the catalyst used in the said first step is an acid.
Claim 12
Dependent Claim
19 words
Process as claimed in claim 10 wherein the catalyst used in the said first step is a Lewis acid.
Claim 13
Dependent Claim
17 words
Process as claimed in claim 10 wherein the catalyst used in the said first step is hexachloro-cyclo-triphosphasene.
Claim 14
Dependent Claim
27 words
Process as claimed in claim 1 wherein said silane reaction with a reactant containing C═C double bonds step is used, further comprising a subsequent esterifying conversion step.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |