EP0655646A1
Expired / Lapsed
EP
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Radiographic material with improved antistatic properties
Assignee: 3M Co
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Filing: 1993-11-29
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Granted: —
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Expires: 2013-11-29
Abstract
Abstract A silver halide radiographic element comprising a polymeric film base, at least one silver halide emulsion layer, and at least one antistatic layer adhered to at least one side of said polymeric film base, wherein (1) said silver halide emulsion layer comprises tabular silver halide grains having an average diameter to thickness ratio of at least 3:1, and (2) said antistatic layer comprises a colloidal vanadium oxide and a sulfopolyester.
Inventors
- 👤 Alberto Valsecchi
- 👤 Renzo Torterolo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 01:37
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/91; G03C5/00; G03C5/16
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
70 words
A silver halide radiographic element comprising a polymeric film base, at least one silver halide emulsion layer, and at least one antistatic layer adhered to at least one side of said polymeric film base, wherein (1) said silver halide emulsion layer comprises tabular silver halide grains having an average diameter to thickness ratio of at least 3:1, and (2) said antistatic layer comprises a colloidal vanadium oxide and a sulfopolyester.
Claim 2
Dependent Claim
18 words
The silver halide radiographic element of claim 1 wherein the polymeric film base comprises a polyester film base.
Claim 3
Dependent Claim
22 words
The silver halide radiographic element of claim 2 wherein said polyester film base is tentered before the application of said antistatic layer.
Claim 4
Dependent Claim
19 words
The silver halide radiographic element of claim 1 wherein said colloidal vanadium oxide comprises whisker-shaped particles of vanadium oxide.
Claim 5
Dependent Claim
19 words
The silver halide radiographic element of claim 1 wherein said colloidal vanadium oxide comprises needle-shaped particles of vanadium oxide.
Claim 6
Dependent Claim
20 words
The silver halide radiographic element of claims 4 and 5, wherein said vanadium oxide particles show a high aspect ratio.
Claim 7
Dependent Claim
20 words
The silver halide radiographic element of claim 6 wherein said vanadium oxide particles show an aspect ratio higher than 10.
Claim 8
Dependent Claim
32 words
The silver halide radiographic element of claim 6 wherein said vanadium oxide particles show a width in the range of from 0.02 to 0.08 mm and a length lower than 5 mm.
Claim 9
Dependent Claim
23 words
The silver hlide radiographic element of claim 1 wherein said colloidal vanadium oxide is present in an amount of at least 0.40 mg/m².
Claim 10
Dependent Claim
53 words
The silver halide radiographic element of claim 1 wherein the sulfopolyester comprises units represented by the formula: where M represents an alkali metal cation or ammonium cation, R₁ represents a sulfosubstituted arylene or aliphatic group, R₂ represents an arylene group, R₃ represents an alkylene group, R₄ represents an alkylene group or cycloalkylene group.
Claim 11
Dependent Claim
22 words
The silver halide radiographic element of claim 1 wherein the weight ratio of sulfopolyester to vanadium oxide ranges from 30:1 to 800:1.
Claim 12
Dependent Claim
25 words
The silver halide radiographic element of claim 1 wherein the antistatic layer has a coating weight in the range of 10 mg/m² to 1 g/m².
Claim 13
Dependent Claim
22 words
The silver halide radiographic element of claim 1 wherein said antistatic layer is coated on only one side of said film base.
Claim 14
Dependent Claim
21 words
The silver halide radiographic element of claim 1 wherein said antistatic layer is coated on both sides of said film base.
Claim 15
Dependent Claim
21 words
The silver halide radiographic element of claim 13 and 14 wherein an auxiliary gelatin layer is adhered to said antistatic layer.
Claim 16
Dependent Claim
27 words
The silver halide radiographic element of claim 13 wherein said silver halide emulsion layer is on the same side of said film base as said antistatic layer.
Claim 17
Dependent Claim
27 words
The silver halide radiographic element of claim 13 wherein the silver halide emulsion layer is on the opposite side of said film base as said antistatic layer.
Claim 18
Dependent Claim
19 words
The silver halide radiographic element of claim 1 wherein an auxiliary gelatin layer is adhered to said antistatic layer.
Claim 19
Dependent Claim
16 words
The silver halide radiographic element of claim 1 wherein the antistatic layer comprises an adhesion promoter.
Claim 20
Dependent Claim
16 words
The silver halide radiographic element of claim 19 wherein said adhesion promoter is an epoxy-silane compound.
Claim 21
Dependent Claim
64 words
The silver halide radiographic element of claim 20 wherein said epoxy-silane compound is represented by the formulae: wherein: R₅ is a divalent hydrocarbon radical of less than 20 carbon atoms, R₆ is hydrogen, an aliphatic hydrocarbon radical of less than 10 carbon atoms or an acyl radical of less than 10 carbon atoms, n is 0 or 1, and m is 1 to 3.
Claim 22
Dependent Claim
45 words
The silver halide radiographic element of claim 20 wherein said epoxy-silane compound is represented by the formulae: wherein: R₇ and R₈ are independently alkylene groups of 1 to 4 carbon atoms, and R₉ is hydrogen or an alkyl group of 1 to 10 carbon atoms.
Claim 23
Dependent Claim
14 words
The silver halide radiographic element of claim 20 wherein said epoxy-silane compound is γ-glycydoxypropyltrimethoxysilane.
Claim 24
Dependent Claim
14 words
The silver halide radiographic element of claim 20 wherein said epoxy-silane compound is β-(3,4-epoxycyclohexyl)-ethyltrimethoxysilane.
Claim 25
Dependent Claim
24 words
The silver halide radiographic element of claim 20 wherein the weight ratio of epoxy-silane to sulfopolyester is in the range of 0.01 to 0.6.
Claim 26
Dependent Claim
17 words
The silver halide radiographic element of claim 20 wherein said epoxy-silane compound is partially or fully hydrolized.
Claim 27
Dependent Claim
18 words
The silver halide radiographic element of claim 20 wherein said epoxy-silane compound is a siloxane polymer or oligomer.
Claim 28
Dependent Claim
20 words
The silver halide radiographic element of claim 19 wherein said adhesion promoter is a non-silane epoxy oligomer or polymer compound.
Claim 29
Dependent Claim
25 words
The silver halide radiographic element of claim 1 characterized in that the side comprising said antistatic layer shows a melting time lower than 10 minutes.
Claim 30
Dependent Claim
25 words
The silver halide radiographic element of claim 1, wherein said tabular silver halide grains have an average diameter to thickness ratio of 3:1 to 8:1.
Claim 31
Dependent Claim
24 words
The silver halide radiographic element of claim 1, wherein said tabular silver halide grains have an average diameter ranging from about 0.3 to 5µm.
Claim 32
Dependent Claim
23 words
The silver halide radiographic element of claim 1, wherein said tabular silver halide grains have an average thickness of 0.4 µm or less.
Claim 33
Dependent Claim
34 words
The silver halide radiographic element of claim 1, wherein not less than 50% of the silver halide grains are tabular silver halide grains having an average diameter to thickness ratio of at least 3:1.
Claim 34
Dependent Claim
20 words
The silver halide radiographic element of claim 1, wherein said silver halide grains are silver bromide or silver bromoiodide grains.
Claim 35
Dependent Claim
31 words
The silver halide radiographic element of claim 34, wherein said silver bromoiodide grains comprise an amount of from 0.5 to 1.5 mol % of iodide relative to the total halide content.
References Cited (Backward Citations)
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US5203884A
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