Method of making magnetizable abrasive particles

Patent metadata

Field	Value
Publication number	US-10655038-B2
Application number	US-201716344304-A
Country	US
Kind code	B2
Filing date	Oct 5, 2017
Priority date	Oct 25, 2016
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A method of making magnetizable abrasive particles includes providing a slurry layer disposed on a substrate. The slurry layer has an exposed surface and comprises magnetic particles, a binder precursor, and a liquid vehicle. Abrasive particles are electrostatically contacted with the slurry layer such that they are aligned substantially oriented perpendicular to the surface of the substrate, and are partially embedded within the slurry layer. The liquid vehicle is at least partially removed from the slurry layer and the binder precursor is converted into a binder to provide a magnetizable layer comprising the magnetic particles partially embedded in the binder. The magnetizable abrasive particles are separated from the releasable substrate. Each magnetizable abrasive particle respectively comprises a portion of the magnetizable layer disposed on a portion of an abrasive particle.

First claim

What is claimed is:

1. A method of making magnetizable abrasive particles, the method comprising sequentially:
providing a slurry layer disposed on a releasable substrate, wherein the slurry layer has an exposed surface, and wherein the slurry layer comprises magnetic particles, a binder precursor, and a liquid vehicle;
electrostatically contacting abrasive particles with the slurry layer, wherein the abrasive particles are aligned substantially oriented perpendicular to the surface of the releasable substrate, and wherein the abrasive particles are partially embedded within the slurry layer;
at least partially removing the liquid vehicle from the slurry layer and converting the binder precursor into a binder to provide a magnetizable layer comprising the magnetic particles and the binder, wherein the abrasive particles are partially embedded in the magnetizable layer;
separating the magnetizable abrasive particles from the releasable substrate, wherein the magnetizable abrasive particles each respectively comprise a portion of the magnetizable layer is disposed on a portion of each of the abrasive particles.

2. The method of claim 1 , wherein the abrasive particles comprise shaped abrasive particles.

3. The method of claim 2 , wherein the abrasive particles comprise precisely-shaped abrasive particles.

4. The method of claim 1 , wherein the abrasive particles respectively comprise platelets having two opposed major facets connected to each other by a plurality of side facets, wherein each magnetizable layer completely covers a respective one of the side facets.

5. The method of claim 4 , wherein the platelets are triangular.

6. The method of claim 1 , wherein the abrasive particles comprise crushed abrasive particles having an aspect ratio of at least 2.

Assignees

• 3M Innovative Properties Co

Inventors

• Martinez Jaime A
• Nelson Thomas J
• Lukowski Mark A

Classifications

• B24D11/00

  Constructional features of flexible abrasive materials; Special features in the manufacture of such materials · CPC title

• C09K3/1409 Primary

  Abrasive particles per se (preparation of diamond C01B32/25) · CPC title

• H01F41/16

  the magnetic material being applied in the form of particles, e.g. by serigraphy {, to form thick magnetic films or precursors therefor} (H01F41/18 {-H01F41/24} take precedence) · CPC title

• C09K3/1436 Primary

  Composite particles, e.g. coated particles · CPC title