Patent EP0452568A1 successfully refreshed from Google Patents.
EP0452568A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A recording material having antistatic properties
Assignee: Agfa Gevaert NV
•
Filing: 1990-04-19
•
Granted: —
•
Expires: 2010-04-19
Abstract
Abstract A recording material comprising a sheet, ribbon or web support and a hydrophilic colloid binder layer incorporating an ionic polymer in the form of dispersed particulate material providing to said material an antistatic character, characterized in that (i) said ionic polymer is a cross-linked copolymer of an acrylic and/or methacrylic acid ester including 90-99 mole % of acrylate and/or methacrylate and 1 to 10 mole % of tetraallyloxyethane as polyfunctional crosslinking monomer, wherein in said copolymer at least 75 % of the ester groups have been transformed into alkali metal carboxylate groups, (ii) said ionic polymer is coated at a coverage of at least 1.4 g/m ², and (iii) said ionic polymer is present in admixture with said hydrophilic colloid binder in a weight ratio of at least 10/90.
Inventors
- 👤 Daniel Maurice Timmerman
- 👤 Filip Boudewijn Ernest Byl
- 👤 Frank Gommaar De Voeght
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 22:39
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/89
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
A recording material comprising a sheet, ribbon or web support and a hydrophilic colloid binder layer incorporating an ionic polymer in the form of dispersed particulate material providing to said material an antistatic character, characterized in that (i) said ionic polymer is a cross-linked copolymer of an acrylic and/or methacrylic acid ester including 90-99 mole % of acrylate and/or methacrylate and 1 to 10 mole % of tetraallyloxyethane as polyfunctional crosslinking monomer, wherein in said copolymer at least 75 % of the ester groups have been transformed into alkali metal carboxylate groups, (ii) said ionic polymer is coated at a coverage of at least 1.4 g/m ², and (iii) said ionic polymer is present in admixture with said hydrophilic colloid binder in a weight ratio of at least 10/90.
Claim 2
Dependent Claim
19 words
A recording material according to any of the preceding claims, wherein said alkalimetal carboxylate groups are potassium carboxylate groups.
Claim 3
Dependent Claim
16 words
A recording material according to claim 1 or 2, wherein said hydrophilic colloid binder is gelatin.
Claim 4
Dependent Claim
29 words
A recording material according to any of claims 1 to 3, wherein said ionic polymer is coated at a coverage in the range of 1.4 to 3 g/m ².
Claim 5
Dependent Claim
36 words
A recording material according to any of the preceding claims, wherein said ionic polymer is coated at a coverage of 2.2 g/m² and in a weight ratio range of at least 50/50 with respect to gelatin.
Claim 6
Dependent Claim
20 words
A recording material according to any of the preceding claims, wherein said antistatic coating is applied as an outermost coating.
Claim 7
Dependent Claim
26 words
A recording material according to any of the preceding claims, wherein said antistatic layer is covered with a protective layer on the basis of hardened gelatin.
Claim 8
Dependent Claim
29 words
A recording material according to claim 7, wherein said gelatin is hardened up to a degree corresponding with the addition of 0.03 g of formaldehyde per gram of gelatin.
Claim 9
Dependent Claim
27 words
A recording material according to claim 7 or 8, wherein the gelatin is present in said protective layer at a coverage up to 3 g per m².
Claim 10
Dependent Claim
23 words
A recording material according to any of claim 6 to 9, wherein said antistatic outermost layer or said protective layer contains friction-lowering substances.
Claim 11
Dependent Claim
104 words
A recording material according to any of the preceding claims, wherein said recording material comprises one or more light-sensitive silver halide emulsion layers and said antistatic coating is present : - as outermost layer at the silver halide emulsion layer side of said photographic silver halide emulsion layer material, and/or - as a back layer at the side of the support opposite the silver halide emulsion layer(s) of said photographic silver halide emulsion layer material, and/or - as a stratum between the support and a silver halide emulsion layer or a silver halide emulsion layer assembly of said photographic silver halide emulsion layer material.
Claim 12
Dependent Claim
18 words
A recording material according to claim 10, wherein said antistatic back layer is present on an antihalation coating.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.