US4785053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical resin material having improved birefringence
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1985-11-01
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Granted: 1988-11-15
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Expires: 2005-11-01
Abstract
Abstract PCT No. PCT/JP85/00607 Sec. 371 Date Jul. 2, 1986 Sec. 102(e) Date Jul. 2, 1986 PCT Filed Nov. 1, 1985 PCT Pub. No. WO86/02653 PCT Pub. Date May 9, 1986.An optical resin material comprising at least two constituent units each having positive and negative main polarizability differences of at least 50x10-25 cm3 in terms of absolute values has small birefringence and good water absorbance, heat resistance and moldability.
Inventors
- 👤 Iko Ito
- 👤 Shozaburo Imai
- 👤 Michihisa Isobe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:30
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/253; G11B7/2533; C; C08; C08F; C08F265/00; C08F265/04; C08F265/06; G02; G02B; G02B1/00; G02B1/04; G11B7/2534; G11B7/2535; G11B7/2536
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
48 words
An optical resin material which comprises at least one constituent unit having positive main polarizability difference, and at least one constituent unit having negative main polarizability difference, and wherein said constituent units have main polarizability differences of at least 50×10 -25 cm 3 in terms of absolute values.
Claim 2
Dependent Claim
48 words
An optical resin material which comprises at least one constituent unit having positive main polarizability difference, and at least one constituent unit having negative main polarizability difference, and wherein said constituent units have main polarizability differences of at least 50×10 -25 cm 3 in terms of absolute values.
Claim 3
Dependent Claim
52 words
The optical resin material according to claim 1, wherein the resin comprises at least two constituent units each having positive and negative main polarizability differences of at least 50×10 -25 cm 3 in terms of absolute values and has a birefringence not larger than 100 nm at a thickness of 1.2 mm.
Claim 4
Dependent Claim
60 words
The optical resin material according to claim 1, wherein the resin comprises a copolymer comprising a constituent unit having a positive main polarizability difference of at least 50×10 -25 cm 3 in terms of an absolute value and a constituent unit having a negative main polarizability difference of at least 50×10 -25 cm 3 in terms of an absolute value.
Claim 5
Dependent Claim
68 words
The optical resin material according to claim 1, wherein the resin comprises a composition containing a resin consisting of a constituent unit having a positive main polarizability difference of at least 50×10 -25 cm 3 in terms of an absolute value and a resin consisting of a constituent unit having a negative main polarizability difference of at least 50×10 -25 cm 3 in terms of an absolute value.
Claim 6
Dependent Claim
18 words
The optical resin material according to claim 1, wherein the resin has water absorbance of 1.8% or less.
Claim 7
Dependent Claim
21 words
The optical resin material according to claim 1, wherein the resin has a glass transition temperature not lower than 70° C.
Claim 8
Dependent Claim
54 words
A transparent optical resin material which comprises an aromatic polycarbonate as a constituent unit having positive main polarizability difference, and an aromatic vinyl polymer as a constituent unit having negative main polarizability difference, and wherein said constituent units have main polarizability differences of at least 50×10 -25 cm 3 in terms of absolute values.
Claim 9
Dependent Claim
54 words
A transparent optical resin material which comprises an aromatic polycarbonate as a constituent unit having positive main polarizability difference, and an aromatic vinyl polymer as a constituent unit having negative main polarizability difference, and wherein said constituent units have main polarizability differences of at least 50×10 -25 cm 3 in terms of absolute values.
Claim 10
Dependent Claim
16 words
The optical resin material according to claim 7, wherein said aromatic vinyl polymer is a polystyrene.
References Cited (Backward Citations)
GB1182807A
Cited
US4196276A
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US4319003A
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US4373065A
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JPS5888843A
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EP0089801A1
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US4495345A
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JPS60185236A
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EP0177713A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |