Patent US4558003A successfully refreshed from Google Patents.
US4558003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hardening of poly(vinyl acetal)
Assignee: Eastman Kodak Co
•
Filing: 1984-03-12
•
Granted: 1985-12-10
•
Expires: 2004-03-12
Abstract
Abstract The addition of a boric acid or borate ion to a poly(vinyl acetal) composition has been found to cause hardening of the composition. The hardened composition is particularly useful in photothermographic emulsions having a poly(vinyl acetal) layer.
Inventors
- 👤 Kiyoshi B. Sagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:11
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30; G03C1/04; G03C1/053; G03C1/494; G03C1/498; G03C1/49836
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
83 words
An unexposed photothermographic article comprising a support, a silver containing layer comprising a binder, a silver compound having reducible silver ions, silver halide in catalytic proximity to said silver compound, and a reducing agent for silver ion, said binder comprising at least 25 percent by weight of a poly(vinyl acetal), said article being characterized by the presence of an amount of borate ion, a boric acid salt, or a boric acid, alone or in combination with an isocyanate, sufficient to harden said binder.
Claim 2
Dependent Claim
83 words
An unexposed photothermographic article comprising a support, a silver containing layer comprising a binder, a silver compound having reducible silver ions, silver halide in catalytic proximity to said silver compound, and a reducing agent for silver ion, said binder comprising at least 25 percent by weight of a poly(vinyl acetal), said article being characterized by the presence of an amount of borate ion, a boric acid salt, or a boric acid, alone or in combination with an isocyanate, sufficient to harden said binder.
Claim 3
Dependent Claim
18 words
The article of claim 1 wherein said binder comprises at least 50 percent by weight of poly(vinyl acetal).
Claim 4
Dependent Claim
18 words
The article of claim 1 wherein said binder comprises at least 75 percent by weight of poly(vinyl acetal).
Claim 5
Dependent Claim
18 words
The article of claim 1 wherein said binder comprises at least 90 percent by weight of poly(vinyl acetal).
Claim 6
Dependent Claim
16 words
The article of claim 1 wherein said binder comprises 100 percent by weight of poly(vinyl acetal).
Claim 7
Dependent Claim
24 words
The article of claim 1 wherein said borate is in the form of an inorganic borate salt, an organic borate salt, or boric acid.
Claim 8
Dependent Claim
55 words
The article of claim 3 wherein said borate is selected from the group consisting of boric acid, boric acid salts, boronic acid, boronic acid salts, meta-boric acid, meta-boric acid salts, pyroboric acid, pyroboric acid salts, perboric acid, perboric acid salts, alkyl boric acids, alkyl boric acid salts, aryl boric acids and aryl boric acid salts.
Claim 9
Dependent Claim
55 words
The article of claim 4 wherein said borate is selected from the group consisting of boric acid, boric acid salts, boronic acid, boronic acid salts, meta-boric acid, meta-boric acid salts, pyroboric acid, pyroboric acid salts, perboric acid, perboric acid salts, alkyl boric acids, alkyl boric acid salts, aryl boric acids and aryl boric acid salts.
Claim 10
Dependent Claim
55 words
The article of claim 5 wherein said borate is selected from the group consisting of boric acid, boric acid salts, boronic acid, boronic acid salts, meta-boric acid, meta-boric acid salts, pyroboric acid, pyroboric acid salts, perboric acid, perboric acid salts, alkyl boric acids, alkyl boric acid salts, aryl boric acids and aryl boric acid salts.
Claim 11
Dependent Claim
21 words
The article of claim 1 wherein said poly(vinyl acetal) is selected from the group consisting of poly(vinyl formal) and poly(vinyl butyral).
Claim 12
Dependent Claim
21 words
The article of claim 3 wherein said poly(vinyl acetal) is selected from the group consisting of poly(vinyl formal) and poly(vinyl butyral).
Claim 13
Dependent Claim
21 words
The article of claim 8 wherein said poly(vinyl acetal) is selected from the group consisting of poly(vinyl formal) and poly(vinyl butyral).
Claim 14
Dependent Claim
21 words
The article of claim 9 wherein said poly(vinyl acetal) is selected from the group consisting of poly(vinyl formal) and poly(vinyl butyral).
Claim 15
Dependent Claim
12 words
The article of claim 11 wherein said poly(vinyl formal) comprises poly(vinyl butyral).
Claim 16
Dependent Claim
12 words
The article of claim 12 wherein said poly(vinyl formal) comprises poly(vinyl butyral).
Claim 17
Dependent Claim
12 words
The article of claim 13 wherein said poly(vinyl formal) comprises poly(vinyl butyral).
Claim 18
Dependent Claim
88 words
An unexposed photothermographic article comprising a support, a silver containing layer comprising a binder, a silver compound having reducible silver ions, silver halide in catalytic proximity to said silver compound, and a reducing agent for silver ion, said binder comprising at least 50 percent by weight of a poly(vinyl acetal), said article being characterized by the presence of an amount of hardening agent for said poly(vinyl acetal) sufficient to harden said binder, said hardening agent consisting essentially of borate ion, a boric acid salt, or a boric acid.
Claim 19
Dependent Claim
88 words
An unexposed photothermographic article comprising a support, a silver containing layer comprising a binder, a silver compound having reducible silver ions, silver halide in catalytic proximity to said silver compound, and a reducing agent for silver ion, said binder comprising at least 50 percent by weight of a poly(vinyl acetal), said article being characterized by the presence of an amount of hardening agent for said poly(vinyl acetal) sufficient to harden said binder, said hardening agent consisting essentially of borate ion, a boric acid salt, or a boric acid.
Claim 20
Dependent Claim
16 words
The article of claim 17 wherein said binder comprises 100 percent by weight of poly(vinyl acetal).
Claim 21
Dependent Claim
22 words
The article of claim 17 wherein said borate is in the form of an inorganic borate salt or an organic borate salt.
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) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |