US4246389A
Expired / Lapsed
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Contact lens composition having increased oxygen permeability
Assignee: American Optical Corp
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Filing: 1979-06-25
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Granted: 1981-01-20
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Expires: 1999-06-25
Abstract
Abstract Acrylic siloxanes having the formula: <IMAGE> where R1 is selected from the class of hydrogen or methyl groups, "a" is an integer from one to five, "b" is an integer from zero to seven, "c" is an integer from zero to two, "d" is an integer from zero to one, A is selected from the class of methyl or phenyl groups, R2 is selected from the class of methyl or phenyl groups, R3 and R4 represent either no group (cyclic ring from "c" to "d") or methyl or phenyl groups, act synergistically with vinyl pyrrolidone and hydroxy ethyl methacrylate to provide optically clear moderate water containing contact lenses of substantially increased oxygen permeability.
Inventors
- 👤 Albert R. LeBoeuf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:21
CPC Classifications
C; C08; C08F; C08F230/00; C08F230/04; C08F230/08; G; G02; G02B; G02B1/00; G02B1/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
145 words
A contact lens material capable of being shaped and hydrated to a soft contact lens having a water content of 35 to 50 wt.% which consists essentially of the polymerization product of (a) 20 to 45 wt.% HEMA, (b) 35 to 50 wt.% VP, and (c) 25 to 45 wt.% of a compound having the formula ##STR3## wherein R 1 is selected from the class of hydrogen or methyl groups, "a" is an integer from one to five, "b" is an integer from zero to seven, "c" is an integer from zero to two, "d" is an interger from zero to one, A is selected from the class of methyl or phenyl groups, R 2 is selected from the class of methyl or phenyl groups, R 3 and R 4 represent either no group (cyclic ring from "c" to "d") or methyl or phenyl groups.
Claim 2
Dependent Claim
145 words
A contact lens material capable of being shaped and hydrated to a soft contact lens having a water content of 35 to 50 wt.% which consists essentially of the polymerization product of (a) 20 to 45 wt.% HEMA, (b) 35 to 50 wt.% VP, and (c) 25 to 45 wt.% of a compound having the formula ##STR3## wherein R 1 is selected from the class of hydrogen or methyl groups, "a" is an integer from one to five, "b" is an integer from zero to seven, "c" is an integer from zero to two, "d" is an interger from zero to one, A is selected from the class of methyl or phenyl groups, R 2 is selected from the class of methyl or phenyl groups, R 3 and R 4 represent either no group (cyclic ring from "c" to "d") or methyl or phenyl groups.
Claim 3
Dependent Claim
33 words
The contact lens material according to claim 1 wherein (c) is a compound selected from the group consisting of methacryloyloxymethyl pentamethyldisiloxane; methacryloyloxypropyl tris(trimethylsilyl)siloxane; methacryloyloxymethyl heptamethylcyclotetrasiloxane; methacryloyloxypropyl heptamethylcyclotetrasiloxane; methacryloyloxypropyl(trimethylsilyl)decamethyl pentasiloxane; and methacryloyloxypropyl dodecamethyl pentasiloxane.
Claim 4
Dependent Claim
30 words
The contact lens material according to claim 1 wherein there is 30 to 40 wt.% of (a), 40 to 45 wt.% of (b) and 20 to 30 wt.% of (c).
Claim 5
Dependent Claim
13 words
The contact lens material according to claim 3 wherein (c) is methacryloyloxypropyl tris(trimethylsilyl)siloxane.
Claim 6
Dependent Claim
132 words
A soft contact lens having 35 to 50 wt.% water which consists essentially of the polymerization product of (a) 20 to 45 wt.% HEMA, (b) 35 to 50 wt.% VP and (c) 25 to 45 wt.% of a compound according to the formula ##STR4## wherein R 1 is selected from the class of hydrogen of methyl groups, "a" is an integer from one to five, "b" is an integer from zero to seven, "c" is an integer from zero to two, "d" is an interger from zero to one, A is selected from the class of methyl or phenyl groups, R 2 is selected from the class of methyl or phenyl groups, R 3 and R 4 represent either no group (cyclic ring from "c" to "d") or methyl or phenyl groups.
Claim 7
Dependent Claim
132 words
A soft contact lens having 35 to 50 wt.% water which consists essentially of the polymerization product of (a) 20 to 45 wt.% HEMA, (b) 35 to 50 wt.% VP and (c) 25 to 45 wt.% of a compound according to the formula ##STR4## wherein R 1 is selected from the class of hydrogen of methyl groups, "a" is an integer from one to five, "b" is an integer from zero to seven, "c" is an integer from zero to two, "d" is an interger from zero to one, A is selected from the class of methyl or phenyl groups, R 2 is selected from the class of methyl or phenyl groups, R 3 and R 4 represent either no group (cyclic ring from "c" to "d") or methyl or phenyl groups.
Claim 8
Dependent Claim
13 words
The soft contact lens according to claim 5 wherein (c) is methacryloyloxypropyl tris(trimethylsilyl)siloxane.
Claim 9
Dependent Claim
43 words
The soft contact lens according to claim 6 wherein (a) is present in an amount of 30 to 40 wt.%, (b) is present in an amount of 40 to 45 wt.% and (c) is present in an amount of 20 to 30 wt.%.
Claim 10
Dependent Claim
15 words
The soft contact lens of claim 7 having a water content of about 42 wt.%.
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) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |