# US 5,700,524 A · High speed coating starts using a shear thinning top layer

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- Number: US 5,700,524 A
- Document ID: US5700524A
- Status: Granted
- Kind: A
- Application number: 08/688,487
- Filed: 1996-07-30
- Granted: 1997-12-23
- Earliest claimed: 1996-07-30
- Assignees: Eastman Kodak Company
- Inventors: Joseph W. Hoff; Douglas S. Finnicum; Steven J. Weinstein
- Web page: https://patentgrep.com/patent/US5700524A

## CPC

- B05D 1/34: Applying different liquids or other fluent materials simultaneously
- G03C 1/74: Applying photosensitive compositions to the base; Drying processes therefor (G03C1/496 takes precedence)
- Y10S 118/04: Curtain coater
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- 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)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A method of coating moveable supports at high speeds comprises moving a support along a path through a coating zone; forming two or more layers including a topmost layer of coating liquids to form a liquid coating composition; and applying the liquid coating composition to the moving support wherein the topmost layer of the liquid coating composition is shear thinning.

## Claims

### Claim 1

A method of applying multiple layers of coating liquids to a moving support comprising:
moving a support along a path through a coating zone;
forming two or more layers including a topmost layer of coating liquid to form a liquid coating composition; and
applying the liquid coating composition to the moving support in the coating zone wherein the topmost layer of the liquid coating composition is topmost before and after reaching the support and is shear thinning.

### Claim 2 (depends on 1)

The method according to claim 1 wherein applying the liquid coating composition to the moving support is done by bead coating.

### Claim 3 (depends on 1)

The method according to claim 1 wherein applying the liquid coating composition to the moving support is done by curtain coating.

### Claim 4 (depends on 1)

The method of claim 1 wherein the topmost coating layer contains a viscosifying agent.

### Claim 5

A method of applying multiple layers of coating liquids to a moving support comprising:
moving a support along a path through a coating zone;
forming two or more layers including a topmost layer of coating liquid to form a liquid coating composition; and
applying the liquid coating composition to the moving support in the coating zone wherein the topmost layer of the liquid coating composition is topmost before and after reaching the support and is shear thinning, the liquid coating composition being determined by reducing the low shear viscosity of the topmost layer to a value such that a coating start can be made, then adding a shear thinning polymer into the reduced viscosity topmost layer such that the new low shear viscosity of the topmost layer is the same as the low shear viscosity of the original composition.

### Claim 6 (depends on 5)

The method of claim 5 wherein the topmost coating layer contains a viscosifying agent.

### Claim 7 (depends on 5)

The method of claim 5 wherein applying the liquid coating composition to the moving support is done by bead coating.

### Claim 8 (depends on 5)

The method according to claim 5 wherein applying the liquid coating composition to the moving support is done by curtain coating.