# US 5,332,623 A · Photographic support material

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- Number: US 5,332,623 A
- Document ID: US5332623A
- Status: Granted
- Kind: A
- Application number: 08/063,281
- Filed: 1993-05-18
- Granted: 1994-07-26
- Earliest claimed: 1992-05-23
- Assignees: Felix Schoeller jr. Papierfabrik GmbH & Co. KG
- Inventors: Ralf-Burkhard Dethlefs
- Web page: https://patentgrep.com/patent/US5332623A

## CPC

- G03C 1/79: Macromolecular coatings or impregnations therefor, e.g. varnishes
- D21H 19/60: Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
- Y10T 428/253: Cellulosic [e.g., wood, paper, cork, rayon, etc.]
- Y10T 428/254: Polymeric or resinous material
- Y10T 428/31895: Paper or wood
- G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G)
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A photographic support material includes a base paper and at least one polyolefin layer arranged on the base paper and containing titanium dioxide, and a methyl substituted chinacridone red pigment in the polyolefin which is a chinolino (2,3-b) acridine-7,14-dione-5,12-dihydro-3,10-dimethyl.

## Claims

### Claim 1

A photographic support material comprising:
a photographic support base material;
at least one polyolefin layer on said base material and containing a white light reflecting pigment therein; and
a methyl substituted chinacridone red pigment in said polyolefin layer, said red pigment comprising a chinolino (2,3-b) acridine-7,14-dione-5,12-dihydro-3,10-dimethyl having a particle size of >100 nm, a density of <1.4 g/cm.sup.3, and a specific surface of <65 m.sup.2 /g as measured by the BET procedure.

### Claim 2 (depends on 1)

The photographic support material of claim 1, wherein said red pigment is present in the amount of about 0.001-0.01% by weight.

### Claim 3 (depends on 1)

The photographic support material of claim 1, wherein said white pigment is titanium dioxide.

### Claim 4 (depends on 2)

The photographic support material of claim 2, wherein said white pigment is titanium dioxide.

### Claim 5 (depends on 1)

The photographic support material of claim 1, wherein said base material is paper.