# US 5,350,729 A · Developer sheet with structured clays and process thereof

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- Number: US 5,350,729 A
- Document ID: US5350729A
- Status: Granted
- Kind: A
- Application number: 08/025,083
- Filed: 1993-03-02
- Granted: 1994-09-27
- Earliest claimed: 1993-03-02
- Assignees: The Mead Corporation
- Inventors: Michael G. Londo; Datta G. Mislankar
- Web page: https://patentgrep.com/patent/US5350729A

## CPC

- B41M 5/155: Colour-developing components, e.g. acidic compounds; Additives or binders therefor; Layers containing such colour-developing components, additives or binders
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)

## Abstract

A developer composition containing a structured clay having a void volume greater than about 50%, a binder and a developer resin, and a developer sheet comprising a such developer composition on a support are described.

## Claims

### Claim 1

A developer sheet comprising a support having a developer composition on the surface thereof, said composition comprising a structured clay having a void volume greater than about 50%, a binder and a developer resin.

### Claim 2 (depends on 1)

The developer sheet of claim 1 wherein said binder is a synthetic binder, a natural binder or a mixture thereof.

### Claim 3 (depends on 2)

The developer sheet of claim 2 wherein said binder is selected from the group consisting of polyvinyl acetate, styrene butadiene copolymer, starch, gum arabic or mixtures thereof.

### Claim 4 (depends on 1)

The developer sheet of claim 1 wherein said developer resin is a phenolic resin.

### Claim 5 (depends on 4)

The developer sheet of claim 4 wherein said phenolic resin is a metallated phenolic resin.

### Claim 6 (depends on 1)

The developer sheet of claim 1 wherein said developer resin is present in an amount of about 10% to 15%.

### Claim 7 (depends on 1)

The developer sheet of claim 1 wherein said binder is present in an amount of about 5% to 10%.

### Claim 8 (depends on 1)

The developer sheet of claim 1 wherein said structured clay is present in an amount of about 65% to 75%.

### Claim 9 (depends on 1)

The developer sheet of claim 1 wherein said structured clay is a thermally structural clay, a chemically structured clay or a mixture thereof.

### Claim 10 (depends on 9)

The developer sheet of claim 9 wherein said structured clay has a void volume of about 51% to 55%.

### Claim 11 (depends on 9)

The developer sheet of claim 9 wherein said thermally structured clay is a calcined kaolin pigment.

### Claim 12 (depends on 11)

The developer sheet of claim 11 wherein said calcined kaolin pigment has an irregular shape.

### Claim 13 (depends on 12)

The developer sheet of claim 12 wherein said irregular shape comprises platelets.

### Claim 14 (depends on 9)

The developer sheet of claim 9 wherein said chemically structured clay is produced by using a cationic polymer to bulk hydrated kaolin.