Patent US4756101A successfully refreshed from Google Patents.
US4087282A
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Flocculating agent for photographic emulsions
Assignee: Fujifilm Holdings Corp
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Filing: 1976-09-16
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Granted: 1978-05-02
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Expires: 1996-09-16
Abstract
Abstract A method of flocculating a gelatin-silver halide photographic emulsion, which comprises flocculating the silver halide with gelatin at a pH of 6 or less in the presence of a polymer consisting essentially of recurring units represented by General Formula (Ia) or (Ib): ##STR1## in which R 1 and R 2 , which can be the same or different, represent aliphatic groups, R 3 represents a hydrogen atom, an aliphatic group, an aryl group or an aralkyl group, X represents --O-- or --NH--, M represents a cation and X and R 3 may linked to each other to form a cyclic amino group.
Inventors
- 👤 Akio Mitsui
- 👤 Takushi Miyazako
- 👤 Takashi Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:21
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
103 words
A method of flocculating a gelatin-silver halide photographic emulsion, which comprises flocculating the silver halide with gelatin at a pH of 6 or less in the presence of a polymer consisting essentially of recurring units represented by General Formula (Ia) or (Ib): ##STR7## in which R 1 and R 2 , which can be the same or different, represent aliphatic groups, R 3 represents a hydrogen atom, an aliphatic group, an aryl group or an aralkyl group, X represents --O-- or --NH--, M represents a cation and X and R 3 may be linked to each other to form a cyclic amino group.
Claim 2
Independent Claim
103 words
A method of flocculating a gelatin-silver halide photographic emulsion, which comprises flocculating the silver halide with gelatin at a pH of 6 or less in the presence of a polymer consisting essentially of recurring units represented by General Formula (Ia) or (Ib): ##STR7## in which R 1 and R 2 , which can be the same or different, represent aliphatic groups, R 3 represents a hydrogen atom, an aliphatic group, an aryl group or an aralkyl group, X represents --O-- or --NH--, M represents a cation and X and R 3 may be linked to each other to form a cyclic amino group.
Claim 3
Dependent Claim
22 words
The method of flocculating as claimed in claim 1, wherein the molecular weight of the polymer is about 2,000 to about 500,000.
Claim 4
Dependent Claim
27 words
The method of flocculating as claimed in claim 1, wherein the gelatin concentration of the system before the settling is about 0.5 to about 10% by weight.
Claim 5
Dependent Claim
37 words
The method of flocculating as claimed in claim 1, wherein the amount of the polymer added is about 1/50 to about 1/4 times by weight as much as the amount of the gelatin contained in the emulsion.
Claim 6
Dependent Claim
25 words
The method of flocculating as claimed in claim 1, wherein the polymer is added to the gelatin-silver halide system after the silver halide is formed.
Claim 7
Dependent Claim
17 words
The method of flocculating as claimed in claim 2, wherein said molecular weight is 3,000 to 200,000.
Claim 8
Dependent Claim
28 words
The method of flocculating as claimed in claim 1, wherein said aliphatic groups for R 1 and R 2 are alkyl groups having 1 to 16 carbon atoms.
Claim 9
Dependent Claim
18 words
The method of flocculating as claimed in claim 7, wherein said alkyl groups are methyl and isoamyl groups.
Claim 10
Dependent Claim
50 words
The method of flocculating as claimed in claim 1, wherein for R 3 , said aliphatic group is an alkyl group having 1 to 18 carbon atoms or an allyl group, said aryl group has 6 to 16 carbon atoms and said aralkyl group has 6 to 16 carbon atoms.
Claim 11
Dependent Claim
25 words
The method of flocculating as claimed in claim 1, wherein for M, said cation is hydrogen, an alkali metal, an ammonium group or an amine.
Claim 12
Dependent Claim
27 words
The method of flocculating as claimed in claim 1, wherein said recurring units represented by General Formula (Ia) or (Ib) are selected from the following units: ##STR8##
Claim 13
Dependent Claim
19 words
The method of flocculating as claimed in claim 3, wherein said gelatin concentration is 0.5 to 2% by weight.
Claim 14
Dependent Claim
16 words
The method of flocculating as claimed in claim 1, wherein said pH is 4.5 to 3.5.
Claim 15
Dependent Claim
34 words
The method of flocculating as claimed in claim 4, wherein said amount of polymer added is 1/40 to 1/10 times by weight as much as the amount of the gelatin contained in the emulsion.
Claim 16
Dependent Claim
23 words
The method of flocculating as claimed in claim 1, wherein said flocculating is at a temperature of about 30° to about 50° C.
Claim 17
Dependent Claim
17 words
The method of flocculating as claimed in claim 15, wherein said temperature is 35° to 45° C.
Claim 18
Dependent Claim
136 words
The method of flocculating as claimed in claim 1, wherein in the General Formula (Ia) or (Ib): i. X is O, M is Na, R 3 is H, R 1 is CH 3 , R 2 is CH 3 and the polymerization degree is about 200; ii. X is O, M is Na, R 3 is H, R 1 is CH 3 , R 2 is CH 3 and the polymerization degree is about 300; iii. X is O, M is Na, R 3 is H, R 1 is CH 3 , R 2 is CH 3 and the polymerization degree is about 500; or iv. X is O, M is Na, R 3 is H, R 1 is CH 3 , R 2 is C 4 H 9 and the polymerization degree is about 200.
Claim 19
Dependent Claim
45 words
The method of flocculating as claimed in claim 17, wherein in the General Formula (Ia) or (Ib) X is O, M is Na, R 3 is H, R 1 is CH 3 , R 2 is CH 3 and the polymerization degree is about 200.
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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |