Patent US4119463A successfully refreshed from Google Patents.
US4119463A
Expired / Lapsed
US
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Photographic binder comprising isobutylene-maleic anhydride copolymer
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1976-04-20
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Granted: 1978-10-10
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Expires: 1996-04-20
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
2026-11-08 05:07
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
In a method for producing a photographic light sensitive material which comprises a support and photographic layers coated thereon, the improvement comprising using, as a binder for forming the photographic layers, the PVA treated product obtained by heating an isobutylene-maleic anhydride copolymer, a styrene-maleic anhydride copolymer and polyvinyl alcohol in an aqueous solution.
Claim 2
Dependent Claim
53 words
In a method for producing a photographic light sensitive material which comprises a support and photographic layers coated thereon, the improvement comprising using, as a binder for forming the photographic layers, the PVA treated product obtained by heating an isobutylene-maleic anhydride copolymer, a styrene-maleic anhydride copolymer and polyvinyl alcohol in an aqueous solution.
Claim 3
Dependent Claim
18 words
The method according to claim 1, wherein said polyvinyl alcohol has a saponification degree of at least 95%.
Claim 4
Dependent Claim
17 words
The method according to claim 1, wherein said polyvinyl alcohol has an average polymerization degree of 300-2,000.
Claim 5
Dependent Claim
31 words
The method 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
34 words
The method according to claim 1, 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 7
Dependent Claim
19 words
The method according to claim 1, wherein the heating is carried out at a temperature higher than 60° C.
Claim 8
Dependent Claim
16 words
The method according to claim 1, wherein the aqueous solution has a pH of about 4.
Claim 9
Dependent Claim
15 words
The method according to claim 1, wherein the heating is carried out at 95°-100° C.
Claim 10
Dependent Claim
24 words
The method 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 11
Dependent Claim
24 words
The method 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.
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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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |