Patent US4153458A successfully refreshed from Google Patents.
US4153458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic binder mixture of three polymers
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1977-11-01
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Granted: 1979-05-08
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Expires: 1997-11-01
Abstract
Abstract A photographic binder prepared by heating a mixed aqueous solution of styrene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer and polyvinyl alcohol in acidic state makes it possible to coat a photographic coating liquid for forming photographic layers in the same manner as in the case of using gelatin and furthermore gives excellent physical properties to the resultant photographic layers.
Inventors
- 👤 Shigeru Iguchi
- 👤 Tamotu Iwata
- 👤 Tetsuo Yano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:00
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
51 words
A photographic binder prepared by heating an isobutylene-maleic anhydride copolymer, a styrene-maleic anhydride copolymer and polyvinyl alcohol in the form of aqueous solution wherein the ranges of amounts of the isobutylene-maleic anhydride copolymer, styrene-maleic anhydride copolymer and polyvinyl alcohol are 1-45% by weight, 5-49% by weight and 50-94% by weight, respectively.
Claim 2
Dependent Claim
51 words
A photographic binder prepared by heating an isobutylene-maleic anhydride copolymer, a styrene-maleic anhydride copolymer and polyvinyl alcohol in the form of aqueous solution wherein the ranges of amounts of the isobutylene-maleic anhydride copolymer, styrene-maleic anhydride copolymer and polyvinyl alcohol are 1-45% by weight, 5-49% by weight and 50-94% by weight, respectively.
Claim 3
Dependent Claim
19 words
A photographic binder according to claim 1, wherein said polyvinyl alcohol has a saponification degree of at least 95%.
Claim 4
Dependent Claim
19 words
A photographic binder according to claim 1, wherein said polyvinyl alcohol has an average polymerization degree of 300- 2,000.
Claim 5
Dependent Claim
30 words
A photographic binder according to claim 1, wherein said isobutylene-maleic anhydride copolymer and styrene-maleic anhydride copolymer have an average molecular weight of 5× 10 4 - 15× 10 4 .
Claim 6
Dependent Claim
20 words
A photographic binder according to claim 1, wherein the heating is carried out at a temperature higher than 60° C.
Claim 7
Dependent Claim
17 words
A photographic binder according to claim 1, wherein the aqueous solution has a pH of about 4.
Claim 8
Dependent Claim
17 words
A photographic binder according to claim 5, wherein the heating is carried out at 95°- 100° C.
Claim 9
Dependent Claim
25 words
A photographic binder according to claim 1 wherein the ratio of the amount of isobutylene-maleic anhydride copolymer, styrene-maleic anhydride copolymer and polyvinyl alcohol is 1:4:16.
Claim 10
Dependent Claim
25 words
A photographic binder according to claim 1 wherein the ratio of the amount of isobutylene-maleic anhydride copolymer, styrene-maleic anhydride copolymer and polyvinyl alcohol is 15:35:250.
Claim 11
Dependent Claim
27 words
A photographic light sensitive material which comprises a support and photographic layers coated thereon, wherein the photographic layers contain as a binder the product of claim 1.
Claim 12
Dependent Claim
27 words
A photographic light sensitive material according to claim 10 wherein the ratio of the amount of isobutylene-maleic anhydride copolymer, styrene-maleic anhydride copolymer and polyvinyl alcohol is 1:4:16.
Claim 13
Dependent Claim
27 words
A photographic light sensitive material according to claim 10 wherein the ratio of the amount of isobutylene-maleic anhydride copolymer, styrene-maleic anhydride copolymer and polyvinyl alcohol is 15:35:250.
Claim 14
Dependent Claim
21 words
A photographic light sensitive material according to claim 10 wherein the polyvinyl alcohol has a saponification degree of at least 95%.
Claim 15
Dependent Claim
20 words
A photographic light sensitive material according to claim 13 wherein the polyvinyl alcohol has an average polymerization degree of 300-2,000.
Claim 16
Dependent Claim
32 words
A photographic light sensitive material according to claim 14 wherein the isobutylene-maleic anhydride copolymer and styrene-maleic anhydride copolymer have an average molecular weight of 5× 10 4 to 15× 10 4 .
References Cited (Backward Citations)
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US3723127A
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US3726822A
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US4120724A
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US4019908A
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US4033772A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |