# US 10,307,883 B2 · Finishing method and polishing material for painted surface

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- Number: US 10,307,883 B2
- Document ID: US10307883B2
- Status: Granted
- Kind: B2
- Application number: 15/308,205
- Filed: 2015-05-27
- Published: 2017-04-13
- Granted: 2019-06-04
- Earliest claimed: 2014-05-27
- Assignees: 3M Innovative Properties Company
- Applicants: 3M Innovative Properties Company
- Inventors: Yoko Nakamura; Norikazu Maeda; Toru Aoki
- Web page: https://patentgrep.com/patent/US10307883B2

## CPC

- B24B 37/24: characterised by the composition or properties of the pad materials
- B24B 19/22: characterised by a special design with respect to properties of the material of non-metallic articles to be ground
- B24B 27/033: for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
- B24D 3/28: Resins {or natural or synthetic macromolecular compounds (B24D3/22 takes precedence)}
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24D: TOOLS FOR GRINDING, BUFFING OR SHARPENING (abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls B24B31/14; honing tools B24B33/08; lapping tools B24B37/11)

## Abstract

PROBLEM: To provide a finishing method for a painted surface that can reduce the number of processing steps, and that can shorten the finish polishing time and reduce the polishing area. RESOLUTION MEANS: The painted surface finishing method of an embodiment of the present disclosure includes a step of removing irregularities in a painted surface using a polishing material including a polishing layer with a structural surface where a plurality of three-dimensional elements are arranged, and providing a surface suitable for finish polishing; and a step of finish polishing the surface; wherein the polishing layer contains abrasive diamond particles with an average particle diameter of 0.5 to 5 μm, and a binder containing an epoxy resin.

## Claims

### Claim 1

A painted surface finishing method, comprising:
preparing the painted surface for finish polishing, the painted surface comprising an irregularity comprising a protruding part of a paint with a size of approximately 0.5 to 5 mm, by removing the irregularity using a polishing material comprising a polishing layer having a structural surface where a plurality of three-dimensional elements are provided, wherein the polishing layer comprises abrasive diamond particles with an average particle diameter of 0.5 to 5 μm and a binder containing an epoxy resin; and
finish polishing the surface to a Rz of 0.5 μm or less after removing the irregularity without performing a rough polishing step.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the plurality of three-dimensional elements has a shape selected from a group comprising pyramidal, conical, truncated pyramidal, truncated conical, and combinations thereof.

### Claim 3 (depends on 1)

The method according to claim 1 wherein the abrasive diamond particles have an average particle diameter of 1 μm to 4 μm.

### Claim 4 (depends on 1)

The method according to claim 1 wherein the removing the irregularity comprises bringing the polishing material attached to an electric or pneumatic driven sander into contact with the irregularity.

### Claim 5 (depends on 4)

The method according to claim 4 wherein a force applied to the sander when the polishing material is brought into contact with the irregularity is 3 kgf or less.

### Claim 6 (depends on 5)

The method according to claim 5 wherein water is provided as a lubricating agent to the surface of the polishing material.

### Claim 7 (depends on 6)

The method according to claim 6 wherein finish polishing is performed by attaching a buff to an electric or pneumatic driven sander, and bringing the buff into contact with an area of the painted surface where finish polishing is to be performed.

### Claim 8 (depends on 7)

The method according to claim 7 wherein a polishing compound is applied to the buff surface, the area of the painted surface where finish polishing is to be performed, or both.