# US 4,400,439 A · Recording media

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- Number: US 4,400,439 A
- Document ID: US4400439A
- Status: Granted
- Kind: A
- Application number: 06/232,491
- Filed: 1981-02-09
- Granted: 1983-08-23
- Earliest claimed: 1980-02-07
- Assignees: Process Shizai Co., Ltd.
- Inventors: Takashi Kashiwagi; Nobuyuki Inoue
- Web page: https://patentgrep.com/patent/US4400439A

## CPC

- B41M 5/368: {involving the creation of a soluble/insoluble or hydrophilic/hydrophobic permeability pattern; Peel development (B41M5/366 takes precedence)}
- G03F 7/0215: {Natural gums; Proteins, e.g. gelatins; Macromolecular carbohydrates, e.g. cellulose; Polyvinyl alcohol and derivatives thereof, e.g. polyvinylacetals}
- G03F 7/038: Macromolecular compounds which are rendered insoluble or differentially wettable (G03F7/075 takes precedence; macromolecular azides G03F7/012; macromolecular diazonium compounds G03F7/021)
- Y10S 428/913: Material designed to be responsive to temperature, light, moisture
- Y10S 430/165: Thermal imaging composition
- Y10T 428/24901: including coloring matter
- Y10T 428/31507: Of polycarbonate
- Y10T 428/31623: Next to polyamide or polyimide
- Y10T 428/31685: Natural source polyamide [e.g., casein, gelatin, etc.]
- Y10T 428/31768: Natural source-type polyamide [e.g., casein, gelatin, etc.]
- Y10T 428/31775: Paper
- Y10T 428/31786: Of polyester [e.g., alkyd, etc.]
- Y10T 428/31938: Polymer of monoethylenically unsaturated hydrocarbon
- Y10T 428/31971: Of carbohydrate
- 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)
- G03F: PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR; (phototypographic composing devices B41B; photosensitive materials or processes for photographic purposes G03C; electrophotography, sensitive layers or processes therefor G03G)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A recording medium is described comprising a recording layer having provided on a support, wherein the recording layer contains at least one chemically modified thermally coagulatable proteinaceous compound containing therein no intermolecular cross-linking bond.

## Claims

### Claim 1

A thermally-sensitive recording medium comprising a recording layer provided on a support, said recording layer containing at least one chemically modified thermally coagulatable proteinaceous compound containing therein no intermolecular cross-linking bond.

### Claim 2 (depends on 1)

A recording medium as in claim 1, wherein the chemically modified thermally coagulatable proteinaceous compound is light-insensitive.

### Claim 3 (depends on 1)

A recording medium as in claim 1, wherein the chemically modified thermally coagulatable proteinaceous compound is light-sensitive.

### Claim 4 (depends on 2)

A recording medium as in claim 2, wherein the chemically modified thermally coagulatable proteinaceous compound is a graft polymer.

### Claim 5 (depends on 1)

A recording medium as in claim 1, wherein the recording layer contains a heat sensitizer.

### Claim 6 (depends on 1)

A recording medium as in claim 1, wherein the recording layer contains a light sensitizer.

### Claim 7 (depends on 1)

A recording medium as in claim 1, wherein the recording layer contains a light-sensitive chemically modified thermally coagulatable proteinaceous compound containing therein no intermolecular cross-linking bond, and a light-sensitive chemically unmodified thermally coagulatable proteinaceous compound containing therein no intermolecular cross-linking bond.

### Claim 8 (depends on 1, 2, 3, 4, 5)

A recording medium as in claim 1, 2, 3, 4, 5, or 7, wherein the chemically modified thermally coagulatable proteinaceous compound containing therein no intermolecular cross-linking bond is present in an amount of at least about 2% by weight, based on the weight of the recording layer.

### Claim 9 (depends on 6)

A recording medium as in claim 6, wherein the chemically modified thermally coagulatable proteinaceous compound containing therein no intermolecular cross-linking bond is present in an amount of at least about 2% by weight, based on the weight of the recording layer.

### Claim 10 (depends on 1, 2, 3, 4, 5)

A recording medium as in claim 1, 2, 3, 4, 5, or 7, wherein the chemically modified thermally coagulatable proteinaceous compound containing therein no intermolecular cross-linking bond is present in an amount of at least about 10% by weight, based on the weight of the recording layer.

### Claim 11 (depends on 6)

A recording medium as in claim 6, wherein the chemically modified thermally coagulatable proteinaceous compound containing therein no intermolecular cross-linking bond is present in an amount of at least about 10% by weight, based on the weight of the recording layer.