# US 4,374,920 A · Positive developer containing non-ionic surfactants

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- Number: US 4,374,920 A
- Document ID: US4374920A
- Status: Granted
- Kind: A
- Application number: 06/287,465
- Filed: 1981-07-27
- Granted: 1983-02-22
- Earliest claimed: 1981-07-27
- Assignees: American Hoechst Corporation
- Inventors: Stanley F. Wanat; Shane Hsieh
- Web page: https://patentgrep.com/patent/US4374920A

## CPC

- G03F 7/322: {Aqueous alkaline compositions}
- 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)

## Abstract

A developer composition for positive working lithographic printing plates and photoresists comprising an aqueous alkaline solution with a non-ionic surfactant.

## Claims

### Claim 1

A developer for positive working photographic elements which comprises an aqueous solution of hydroxide ions having a pH above about 7.0 provided from an alkali having a concentration in the developer which ranges from about 0.2 to about 10 percent by weight; and a compatible non-ionic surfactant selected from the group consisting of one or more of tetramethyl decynediol and ethoxylated tetramethyl decynediol.

### Claim 2 (depends on 1)

The developer of claim 1 further comprising one or more compounds selected from the group consisting of the metal salts of hydrofluosilicic acid, hydrofluotitanic acid, hydrofluostannic acid, hydrofluoboric acid, orthosilicic acid, metasilicic acid, orthotitanic acid and stannic acid.

### Claim 3 (depends on 2)

The developer of claim 2 wherein the concentration of alkali ranges from about 0.2 to about 10 percent by weight.

### Claim 4 (depends on 3)

The developer of claim 3 wherein the concentration of surfactant ranges from about 0.1 to about 10 percent by weight.

### Claim 5 (depends on 1)

The developer of claim 1 wherein the concentration of surfactant ranges from about 0.1 to about 10 percent by weight.

### Claim 6

A developer for positive working photographic elements which comprises an aqueous solution of hydroxide ions having a pH above about 7.0 from an alkali selected from the group consisting of one or more of trisodium phosphate, sodium hydroxide, monosodium phosphate, sodium silicate, and sodium metasilicate; and a compatible non-ionic surfactant selected from the group consisting of one or more of tetramethyl decynediol and ethoxylated tetramethyl decynediol.

### Claim 7 (depends on 6)

The developer of claim 6 wherein the concentration of surfactant ranges from about 0.1 to about 10 percent by weight.

### Claim 8 (depends on 6)

The developer of claim 6 further comprising one or more compounds selected from the group consisting of the metal salts of hydrofluosilicic acid, hydrofluotitanic acid, hydrofluostannic acid, hydrofluoboric acid, orthosilicic acid, metasilicic acid, orthotitanic acid and stannic acid.