# US 6,094,003 A · Anti-doming composition for a shadow-mask and processes for preparing the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 6,094,003 A
- Document ID: US6094003A
- Status: Granted
- Kind: A
- Application number: 08/955,164
- Filed: 1997-10-21
- Granted: 2000-07-25
- Earliest claimed: 1996-10-31
- Assignees: Samsung Display Devices Co., Ltd.
- Inventors: Jae Myung Kim; Hwan Chul Rho; Dong Hee Han; Sung-Hwan Moon
- Web page: https://patentgrep.com/patent/US6094003A

## CPC

- H01J 29/07: Shadow masks for colour television tubes
- H01J 9/146: {Surface treatment, e.g. blackening, coating (H01J9/144 takes precedence)}
- H01J 2229/0783: improving thermal radiation properties
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

An anti-doming composition including a mixture of electron reflecting material such as bismuth oxide, and a zeolite, and a shadow-mask coated with the composition restrict temperature increase by preventing heat transfer, an anti-doming composition including lead and a ZnO, B.sub.2 O.sub.3, Bi.sub.2 O.sub.3 or a mixture thereof, and a shadow-mask coated with the composition protect mechanical expansion of a shadow-mask, and an anti-doming composition including ferroelectrics such as PZT, PT, PZ or PLZT, and a shadow-mask coated with the composition restrict temperature increase by changing the energy of electron beams into non-thermal energy. The shadow-mask of the present invention reduces about 30 to 50% of the anti-doming ratio and has a low production cost and easiness during processes.

## Claims

### Claim 1

A shadow mask comprising:
a steel layer having a plurality of holes for passing electron beams therethrough; and
a coating layer using an anti-doming composition comprising a vehicle selected from epoxy resins and butyl carbitol and at least one compound selected from the group consisting of PZT (PbZrTiO.sub.3), PT (PbTiO.sub.3), PZ (PbZrO.sub.3) and PLZT [(PbLa)(ZrTi)O.sub.3 ].

### Claim 2 (depends on 1)

The shadow-mask as claimed in claim 1, wherein said coating layer is prepared by a silk screen printing method and has a thickness of 3 to 30 .mu.m.

### Claim 3

In a process for preparing a shadow-mask comprising the steps of preparing a steel layer having a plurality of holes for passing electron beams therethrough and coating an anti-doming composition to produce a coating layer on the steel layer, the improvement comprising:
said anti-doming composition includes at least one vehicle selected from the group consisting of epoxy resins and butyl carbitol and at least one compound selected from the group of PZT (PbZrTiO.sub.3), PT (PbTiO.sub.3), PZ (PbZrO.sub.3), and PLZT [(PbLa)(ZrTi)O.sub.3 ].

### Claim 4 (depends on 3)

The process as claimed in claim 3, wherein said coating layer is prepared by a silk screen printing method and has a thickness of 3 to 30 .mu.m.