US4525563A
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Oxygen permeable soft contact lens composition
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1984-03-13
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Granted: 1985-06-25
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Expires: 2004-03-13
Abstract
Abstract A copolymer comprising, (a) a hydrophilic siloxanylalkyl ester having a structure in which a siloxane part (1) having a terminal acryloyl or methacryloyl group and a siloxane part (2) having a terminal hydrophilic group are bonded through an alkylene chain with each other, (b) a hydrophilic monomer, and (c) a hydrophobic monomer is suitable for use in the production of a soft contact lens having a high oxygen permeability and an excellent affinity for the eye tissue which can be worn continuously for a long period of time.
Inventors
- 👤 Takanori Shibata
- 👤 Toshiharu Yoshikawa
- 👤 Kenichi Isobe
- 👤 Shoji Ichinohe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:04
CPC Classifications
C; C08; C08F; C08F230/00; C08F230/04; C08F230/08; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
126 words
A copolymer suitable for use in the production of an oxygen permeable soft contact lens, comprising a copolymer of the following monomers: (a) a hydrophilic siloxanylalkyl ester having the formula (I): ##STR29## wherein R 1 is hydrogen atom or methyl group, R 2 is methyl group or --OSi(CH 3 ) 3 , R 3 is a hydrophilic group selected from the group consisting of an oligo ether residue, a diol residue, an aminohydrin residue and an acid amido residue, n is an integer of 1 to 4, m and l are 0 or an integer of 1 to 2, and k is an integer of 2 to 4, or an admixture thereof, (b) a hydrophilic monomer other than said monomer (a), and (c) a hydrophobic monomer.
Claim 2
Dependent Claim
126 words
A copolymer suitable for use in the production of an oxygen permeable soft contact lens, comprising a copolymer of the following monomers: (a) a hydrophilic siloxanylalkyl ester having the formula (I): ##STR29## wherein R 1 is hydrogen atom or methyl group, R 2 is methyl group or --OSi(CH 3 ) 3 , R 3 is a hydrophilic group selected from the group consisting of an oligo ether residue, a diol residue, an aminohydrin residue and an acid amido residue, n is an integer of 1 to 4, m and l are 0 or an integer of 1 to 2, and k is an integer of 2 to 4, or an admixture thereof, (b) a hydrophilic monomer other than said monomer (a), and (c) a hydrophobic monomer.
Claim 3
Dependent Claim
196 words
The copolymer suitable for use in the production of an oxygen permeable soft contact lens of claim 1, wherein the substituent group defined as R 3 in the formula (I) is a hydrophilic group selected from the group consisting of an oligo ether residue having the formula: --(CH.sub.2).sub.3 O(CH.sub.2 CH.sub.2 O).sub.x --R.sup.4 wherein x is 0 or an integer of 1 to 5 and R 4 is hydrogen atom or an alkyl group having 1 to 4 carbon atoms; a diol residue having the formula: ##STR30## wherein y is an integer of 1 to 3; an aminohydrin residue having the formula: ##STR31## wherein R 5 and R 6 are the same or different, and each is hydrogen atom or an alkyl group having 1 to 4 carbon atoms; an aminohydrin residue having the formula: ##STR32## wherein a is an integer of 4 to 7; an acid amido residue having the formula: ##STR33## wherein R 7 and R 8 are the same or different and each is hydrogen atom or an alkyl group having 1 to 4 carbon atoms; and an acid amido residue having the formula: ##STR34## wherein b is an integer of 4 to 7.
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) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |