# US 10,308,598 B1 · Copper protective agent

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- Number: US 10,308,598 B1
- Document ID: US10308598B1
- Status: Granted
- Kind: B1
- Application number: 15/741,772
- Filed: 2017-12-21
- Published: 2019-05-16
- Granted: 2019-06-04
- Earliest claimed: 2017-12-21
- Assignees: Shenzhen China Star Optoelectronics Technology Co., Ltd.
- Applicants: Shenzhen China Star Optoelectronics Technology Co., Ltd.
- Inventors: Yue Wu
- Web page: https://patentgrep.com/patent/US10308598B1

## CPC

- C07C 321/04: of an acyclic saturated carbon skeleton
- C07C 319/02: of thiols
- C07C 321/02: Thiols having mercapto groups bound to acyclic carbon atoms
- C07F 1/02: Lithium compounds
- C23F 11/16: Sulfur-containing compounds
- G03F 7/425: {containing mineral alkaline compounds; containing organic basic compounds, e.g. quaternary ammonium compounds; containing heterocyclic basic compounds containing nitrogen}
- G03F 7/422: {using liquids only (G03F7/421 takes precedence)}
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)
- C23F: NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE (working metal by laser beams B23K26/00; desurfacing by applying flames B23K7/00; working of metal by electro-erosion B23H; producing decorative effects by removing surface material, e.g. by engraving, by etching, B44C1/22; electrolytic etching or polishing C25F); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- 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 copper protective agent is provided. The copper protective agent is represented by a general formula (GI): HS—R (GI); and R is a linear or branched alkyl group having 1 to 20 carbon atoms.

## Claims

### Claim 1

A method of preparing a copper protective agent, comprising steps of:
a step S1 of adding N-butyl lithium into a tetrahydrofuran solution having a halogenated hydrocarbon dropwise at −78° C. under protection of an inert gas, to form a reaction system;
a step S2 of adding sulfur powders into the reaction system, and gradually increasing a temperature of the reaction system to the room temperature, wherein the sulfur powders and the reaction system react at the room temperature;
a step S3 of extracting the reaction system with an organic solvent to obtain a crude product; and
a step S4 of purifying the crude product by a column chromatography or a distillation technique to obtain a purified copper protective agent;
wherein the copper protective agent is represented by a general formula (GI):
HS—R(GI); and
wherein R is a linear or branched alkyl group having 1 to 20 carbon atoms.

### Claim 2 (depends on 1)

The preparation method according to claim 1, wherein in the step S3, the organic solvent is dichloromethane or diethyl ether.

### Claim 3 (depends on 1)

The preparation method according to claim 1, wherein in the step S2, a weight ratio of the sulfur powders to the halogenated hydrocarbon ranges from 1:1 to 1:1.5.

### Claim 4 (depends on 1)

The preparation method according to claim 1, wherein in the step S1, the halogenated hydrocarbon is a brominated hydrocarbon.

### Claim 5 (depends on 4)

The preparation method according to claim 4, wherein the brominated hydrocarbon is selected from the group consisting of 1-bromobutane, 2-bromobutane, 1-bromo-2-methyl propane and 2-bromo-2-methyl propane.

### Claim 6 (depends on 1)

The method of preparing a copper protective agent according to claim 1, wherein R is a linear or branched alkyl group having 1 to 10 carbon atoms.

### Claim 7 (depends on 1)

The method of preparing a copper protective agent according to claim 1, wherein R is N-butyl, sec-butyl, isobutyl or tert-butyl.

### Claim 8 (depends on 1)

The method of preparing a copper protective agent according to claim 1, wherein the copper protective agent is represented by one of formulas selected from formula (F1) to formula (F4):