US4644025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens materials of high refractive indexes
Assignee: Kureha Corp
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Filing: 1985-06-19
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Granted: 1987-02-17
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Expires: 2005-06-19
Abstract
Abstract Compositions each comprising a copolymer of a specific allylic or (meth)acrylic compound of an iodine-substituted benzoic acid derivative and a comonomer have a refractive index n D 20 of at least 1.58 and an Abbe's number of at least 28 and are excellent starting materials for the production of high quality lenses.
Inventors
- 👤 Teruo Sakagami
- 👤 Yasufumi Fujii
- 👤 Naohiro Murayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:55
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; C; C08; C08F; C08F218/00; C08F218/02; C08F218/12; G02B1/041
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
A highly refractive lens material having a refractive index n D 20 of at least 1.58 and an Abbe's number of at least 28, said lens material being a copolymer comprising from 20% to 85% by weight of a monomer (I) represented by the following formula (1) ##STR9## wherein: R represents H or CH 3 ; n is an integer of from 0 to 4; m is an integer of from 1 to 5; and Z represents a CH 2 ═CH--CH 2 --, ##STR10## group, and from 15 to 80% by weight of a monomer (II) copolymerizable with the monomer (I), said monomer (II) comprising a monomer selected from the group consisting of (a) esters of a monohydric or polyhydric alcohol and acrylic acid or methacrylic acid, (b) styrene, divinylbenzene, or vinyltoluene (c) diallyl phthalate or diethylene glycol bis (allyl carbonate), and (d) triallyl cyanurate or triallyl isocyanurate.
Claim 2
Dependent Claim
148 words
A highly refractive lens material having a refractive index n D 20 of at least 1.58 and an Abbe's number of at least 28, said lens material being a copolymer comprising from 20% to 85% by weight of a monomer (I) represented by the following formula (1) ##STR9## wherein: R represents H or CH 3 ; n is an integer of from 0 to 4; m is an integer of from 1 to 5; and Z represents a CH 2 ═CH--CH 2 --, ##STR10## group, and from 15 to 80% by weight of a monomer (II) copolymerizable with the monomer (I), said monomer (II) comprising a monomer selected from the group consisting of (a) esters of a monohydric or polyhydric alcohol and acrylic acid or methacrylic acid, (b) styrene, divinylbenzene, or vinyltoluene (c) diallyl phthalate or diethylene glycol bis (allyl carbonate), and (d) triallyl cyanurate or triallyl isocyanurate.
Claim 3
Dependent Claim
32 words
The lens material as claimed in claim 1 in which the copolymer comprises 40 to 70% by weight of the monomer (I) and 60 to 30% by weight of the comonomer (II).
Claim 4
Dependent Claim
20 words
The lens material as claimed in claim 1 in which the Z is a CH 2 ═CH--CH 2 -- group.
Claim 5
Dependent Claim
16 words
The lens material as claimed in claim 1 in which the Z is a ##STR11## group.
Claim 6
Dependent Claim
20 words
The lens material as claimed in claim 1 in which the multiethylenically unsaturated compound is triallyl cyanurate or triallyl isocyanurate.
References Cited (Backward Citations)
US2465316A
Cited
US3128300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |