Coated abrasive articles and methods of making coated abrasive articles

Patent metadata

Field	Value
Publication number	US-2022016747-A1
Application number	US-201917311139-A
Country	US
Kind code	A1
Filing date	Dec 6, 2019
Priority date	Dec 18, 2018
Publication date	Jan 20, 2022
Grant date	—

Abstract

A coated abrasive article comprises a backing having first and second opposed major surfaces. A make layer is bonded to the first major surface. Agglomerate grinding aid particles are directly bonded to the make layer. At least a portion of the agglomerate grinding aid particles comprise grinding aid particles retained in a binder, and are arranged according to an open predetermined pattern. Abrasive particles are directly bonded to the make layer in spaces between the agglomerate grinding aid particles. A size layer is directly bonded to the make layer, agglomerate grinding aid particles, and abrasive particles. A method of making a coated abrasive article, in which the agglomerate grinding aid particles are deposited onto a curable make layer precursor prior to depositing abrasive particles onto the curable make layer precursor in spaces between the agglomerate grinding aid particles is also disclosed.

First claim

1 - 18 . (canceled)

19 . A coated abrasive article comprising:
a backing having first and second opposed major surfaces; a make layer bonded to the first major surface; agglomerate grinding aid particles directly bonded to the make layer, wherein the agglomerate grinding aid particles comprise grinding aid particles retained in a binder, and wherein at least a portion of the agglomerate grinding aid particles are arranged according to an open predetermined pattern; abrasive particles directly bonded to the make layer, wherein the abrasive particles are disposed in spaces between the agglomerate grinding aid particles; a size layer directly bonded to the make layer, agglomerate grinding aid particles, and abrasive particles.

20 . The coated abrasive article of claim 19 , wherein the agglomerate grinding aid particles are shaped.

21 . The coated abrasive article of claim 20 , wherein the agglomerate grinding aid particles are precisely-shaped.

22 . The coated abrasive article of claim 20 , wherein at least 50% of the agglomerate grinding aid particles are individually positioned at an acute angle between at least one sidewall and the backing.

23 . The coated abrasive article of claim 19 , wherein the abrasive particles are shaped.

24 . The coated abrasive article of claim 23 , wherein the abrasive particles are precisely-shaped.

25 . The coated abrasive article of claim 19 , wherein the agglomerate grinding aid particles are free of abrasive particles.

26 . The coated abrasive article of claim 19 , wherein the ratio of the length of the abrasive particles to the height of agglomerate grinding aid particles is between 1:2 and 2:1.

27 . The coated abrasive article of claim 19 , wherein the agglomerate grinding aid particles and abrasive particle are present in sufficient quantity to form a closed coat.

28 . A method of making a coated abrasive article, the method comprising sequentially:
depositing a curable make layer precursor on a major surface of a backing; depositing agglomerate grinding aid particles onto the curable make layer precursor, wherein the agglomerate grinding aid particles comprise grinding aid particles retained in a binder; depositing abrasive particles onto the curable make layer precursor, wherein the abrasive particles are disposed in spaces between the agglomerate grinding aid particles; at least partially curing the curable make layer precursor to provide an at least partially cured make layer precursor; depositing a curable size layer precursor onto at least a portion of the agglomerate grinding aid particles, abrasive particles, and at least partially cured make layer precursor; and at least partially curing the curable size layer precursor.

29 . The method of claim 28 , wherein the agglomerate grinding aid particles are deposited on the curable make layer precursor according to an open predetermined pattern.

30 . The method of claim 28 , wherein the agglomerate grinding aid particles are shaped.

31 . The method of claim 30 , wherein the agglomerate grinding aid particles are precisely-shaped.

32 . The method of claim 30 , wherein at least 50% of the agglomerate grinding aid particles are individually positioned at an acute angle between at least one sidewall and the backing.

33 . The method of claim 28 , wherein the abrasive particles are shaped.

34 . The method of claim 33 , wherein the abrasive particles are precisely-shaped.

35 . The method of claim 28 , wherein the agglomerate grinding aid particles are free of abrasive particles.

36 . The method of claim 28 , wherein the ratio of the length of the abrasive particles to the height of agglomerate grinding aid particles is between 1:2 and 2:1.

Assignees

• 3M Innovative Properties Co

Inventors

• Li Junting
• Liu Yuyang
• Lukowski Mark A
• Thurber Ernest L
• Koethe Brian G
• Hawkins Ann M
• Wilson Geoffrey I

Classifications

• B24D18/0072 Primary

  using adhesives for bonding abrasive particles or grinding elements to a support, e.g. by gluing · CPC title

• B24D3/342

  incorporated in the bonding agent · CPC title

• B24D2203/00

  Tool surfaces formed with a pattern · CPC title

• B24D3/346

  utilised during polishing, or grinding operation · CPC title

• B24D11/005 Primary

  Making abrasive webs · CPC title