Patent US4582783A successfully refreshed from Google Patents.
US4582783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide material containing an antistatic layer
Assignee: Agfa Gevaert AG
•
Filing: 1985-04-26
•
Granted: 1986-04-15
•
Expires: 2005-04-26
Abstract
Abstract An antistatic layer applied to the back of the photographic material contains (A) a mixture of sodium magnesium silicate and the sodium salt of polystyrene sulphonic acid and (B) a succinic acid semi-ester compound. The antistatic layer is distinguished by high abrasion resistance and its good qualities as writing and printing surface.
Inventors
- 👤 Fritz Nittel
- 👤 Bert Sauter
- 👤 Armin Voigt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:41
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
Photographic material containing at least one silver halide emulsion layer on one side of a polyolefin-coated paper support and an antistatic layer on the other side of the support, characterised in that the following are contained in the antistatic layer: (A) a mixture of a sodium magnesium silicate and the sodium salt of polystyrene sulphonic acid; and (B) a succinic acid semi-ester compound corresponding to one of the following general formulae: ##STR7## wherein R 1 represents an alkyl or alkenyl group having from 8 to 18 carbon atoms; R 2 represents a substituted or unsubstituted cycloakyl or aryl group, a condensed arylcycloalkyl group, an aralkyl group, or one of the groups: ##STR8## and X represents cyclohexylene, alkylene ##STR9## alkylene, cycloalkylene-alkylene-cycloalkylene, or one of the groups: ##STR10##
Claim 2
Dependent Claim
126 words
Photographic material containing at least one silver halide emulsion layer on one side of a polyolefin-coated paper support and an antistatic layer on the other side of the support, characterised in that the following are contained in the antistatic layer: (A) a mixture of a sodium magnesium silicate and the sodium salt of polystyrene sulphonic acid; and (B) a succinic acid semi-ester compound corresponding to one of the following general formulae: ##STR7## wherein R 1 represents an alkyl or alkenyl group having from 8 to 18 carbon atoms; R 2 represents a substituted or unsubstituted cycloakyl or aryl group, a condensed arylcycloalkyl group, an aralkyl group, or one of the groups: ##STR8## and X represents cyclohexylene, alkylene ##STR9## alkylene, cycloalkylene-alkylene-cycloalkylene, or one of the groups: ##STR10##
Claim 3
Dependent Claim
56 words
Material as claimed in claim 1, wherein the antistatic layer contains from 30 to 150 mg/m 2 of mixture (A) and from 40 to 200 mg/m 2 of succinic acid semi-ester compound (B), the proportions in which the sodium magnesium silicate and the sodium salt of polystyrene sulphonic acid are mixed being from 0.5:1 to 12:1.
Claim 4
Dependent Claim
25 words
Material as claimed in claim 1 wherein the antistatic layer contains a succinic acid semi-ester compound (I) wherein R 2 represents an alkyl-substituted cycloalkyl group.
Claim 5
Dependent Claim
24 words
Material as claimed in claim 3, wherein the cycloalkyl group contains from 1 to 3 methyl groups or a tertiary butyl group as substituents.
Claim 6
Dependent Claim
33 words
Material as claimed in claim 1, wherein the antistatic layer contains a succinic acid semi-ester compound corresponding to the following general formula: ##STR11## wherein n represents an integer of from 1 to 3.
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) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |