Patent US4810764A successfully refreshed from Google Patents.
US4810764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric materials with high oxygen permeability and low protein substantivity
Assignee: Bausch and Lomb Inc
•
Filing: 1988-02-09
•
Granted: 1989-03-07
•
Expires: 2008-02-09
Abstract
Abstract Gas permeable biomedical devices, particularly contact lenses, are formed by polymerizing a mixture which comprises: (a) a polysiloxane which contains fluorinated side chains, (b) a toughening agent which is preferably a fluorinated methacrylate functional compound, and (c) an internal wetting agent which is preferably an oxazolone. r
Inventors
- 👤 Gary D. Friends
- 👤 Jay F. Kunzler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:28
CPC Classifications
C; C08; C08F; C08F30/00; C08F30/04; C08F30/08; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
147 words
A composition formed by polymerizing a mixture comprising: (a) 5 to 100 wt. parts polysiloxane containing fluorinated side chains represented by the general formula ##STR5## where A denotes a radical chosen from the group consisting of methacrylate or acrylate radicals, where R 1 and R 2 independently denote alkyl radicals with 1 to 6 carbon atoms or phenyl radicals, where R 3 and R 4 independently denote radicals chosen from the group consisting of alkyl radicals with 1 to 6 carbon atoms, phenyl radicals or fluorinated alkyl radicals with 1 to 6 carbon atoms, and either R 3 or R 4 denotes a fluorinated alkyl radical with 1 to 6 carbon atoms, and where m+n is at least 1, and n is at least 1; (b) 5 to 80 wt. parts of a toughening agent; and (c) 1 to 20 wt. parts of an internal wetting agent.
Claim 2
Dependent Claim
147 words
A composition formed by polymerizing a mixture comprising: (a) 5 to 100 wt. parts polysiloxane containing fluorinated side chains represented by the general formula ##STR5## where A denotes a radical chosen from the group consisting of methacrylate or acrylate radicals, where R 1 and R 2 independently denote alkyl radicals with 1 to 6 carbon atoms or phenyl radicals, where R 3 and R 4 independently denote radicals chosen from the group consisting of alkyl radicals with 1 to 6 carbon atoms, phenyl radicals or fluorinated alkyl radicals with 1 to 6 carbon atoms, and either R 3 or R 4 denotes a fluorinated alkyl radical with 1 to 6 carbon atoms, and where m+n is at least 1, and n is at least 1; (b) 5 to 80 wt. parts of a toughening agent; and (c) 1 to 20 wt. parts of an internal wetting agent.
Claim 3
Dependent Claim
11 words
The composition of claim 1 wherein A denotes a methacrylate radical.
Claim 4
Dependent Claim
43 words
The composition of claim 2 wherein either R 3 or R 4 is a fluorinated alkyl radical chosen from the group of radicals consisting of 3,3,3 trifluoropropyl, perfluoropropyl, trifluoromethyl, 2,2,2 trifluoroethyl, perfluoroethyl, 4,4,4 trifluorobutyl, perfluorobutyl, 5,5,5 trifluoropentyl, perfluoropentyl, 6,6,6 trifluorohexyl and perfluorohexyl radicals.
Claim 5
Dependent Claim
14 words
The composition of claim 3 where R 1 and R 2 denote methyl radicals.
Claim 6
Dependent Claim
20 words
The composition of claim 4 wherein the ratio of n to the sum of m+n is between 2 and 100.
Claim 7
Dependent Claim
21 words
The composition of claim 5 wherein R 4 denotes the fluorinated alkyl radical, 3,3,3-trifluoropropyl and R 3 denotes a methyl radical.
Claim 8
Dependent Claim
25 words
The composition of claim 1 wherein said toughening agent is a fluorinated methacrylate functional compound chosen from the group consisting of octafluoropentylmethacrylate, hexafluoroisopropylmethacrylate, and decylfluorododecylmethacrylate.
Claim 9
Dependent Claim
13 words
The composition of claim 7 wherein the fluorinated methacrylate functional is octafluoropentyl methacrylate.
Claim 10
Dependent Claim
49 words
The composition of claim 1 wherein the internal wetting agent is an oxazolone which can be represented by the general formula ##STR6## where R 1 and R 2 independently denote a hydrogen atom or a methyl radical and R 3 and R 4 independently denote methyl or cyclohexyl radicals.
References Cited (Backward Citations)
US4314068A
Cited
US4259467A
Cited
US4414375A
Cited
US4327203A
Cited
US4355147A
Cited
WO1982003397A1
Cited
US4604479A
Cited
US4652622A
Cited
US4743667A
Cited
US4686267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |