# US 5,700,302 A · Radiation curable abrasive article with tie coat and method

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- Number: US 5,700,302 A
- Document ID: US5700302A
- Status: Granted
- Kind: A
- Application number: 08/616,544
- Filed: 1996-03-15
- Granted: 1997-12-23
- Earliest claimed: 1996-03-15
- Assignees: Minnesota Mining and Manufacturing Company
- Inventors: William L. Stoetzel; Scott R. Culler
- Web page: https://patentgrep.com/patent/US5700302A

## CPC

- B24D 3/28: Resins {or natural or synthetic macromolecular compounds (B24D3/22 takes precedence)}
- B24D 11/00: Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
- B24D 18/0072: {using adhesives for bonding abrasive particles or grinding elements to a support, e.g. by gluing}
- 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

A method of preparing an abrasive article, and the article produced therefrom is provided. The method includes the steps of: providing a backing having a first major surface; coating the first major surface of the backing with a tie coat precursor, wherein the tie coat precursor comprises a first radiation curable component; applying an abrasive slurry to the first major surface of the backing after coating the tie coat precursor thereon, wherein the abrasive slurry comprises a plurality of abrasive particles and a binder precursor, and further wherein the binder precursor comprises a second radiation curable component; at least partially curing the tie coat precursor; and at least partially curing the binder precursor to form an abrasive article, wherein the abrasive article comprises a backing, an abrasive layer, and a tie coat disposed between the backing and the abrasive layer. Preferably, the method provides a structured abrasive article.

## Claims

### Claim 1

A method of preparing an abrasive article, the method comprising:
(a) providing a backing having a first major surface;
(b) coating the first major surface of the backing with a tie coat precursor, wherein the fie coat precursor comprises a first radiation curable component;
(c) applying an abrasive slurry to the first major surface of the backing after coating the fie coat precursor thereon, wherein the abrasive slurry comprises a plurality of abrasive particles and a binder precursor, and further wherein the binder precursor comprises a second radiation curable component;
(d) at least partially curing the tie coat precursor; and
(e) at least partially curing the binder precursor to form an abrasive article.

### Claim 2 (depends on 1)

The method of claim 1 wherein the step of at least partially curing the tie coat precursor occurs prior to the step of applying an abrasive slurry to the first major surface of the backing.

### Claim 3 (depends on 2)

The method of claim 2 wherein the step of at least partially curing the tie coat precursor comprises exposing the tie coat precursor to radiation energy.

### Claim 4 (depends on 3)

The method of claim 3 wherein the radiation energy comprises ultraviolet radiation, visible radiation, E-beam radiation, or combinations thereof.

### Claim 5 (depends on 1)

The method of claim 1 wherein the steps of at least partially curing the tie coat precursor and at least partially curing the binder precursor occur substantially simultaneously.

### Claim 6 (depends on 5)

The method of claim 5 wherein the steps of at least partially curing the tie coat precursor and at least partially curing the binder precursor comprise exposing both the tie coat precursor and binder precursor to radiation energy.

### Claim 7 (depends on 6)

The method of claim 6 wherein the radiation energy comprises ultraviolet radiation, visible radiation, E-beam radiation, or combinations thereof.

### Claim 8 (depends on 1)

The method of claim 1 wherein the backing comprises a treated cloth.

### Claim 9 (depends on 1)

The method of claim 1 wherein:
(a) the step of applying the abrasive slurry to the backing comprises:
(i) providing a production tool having a contacting surface;
(ii) applying the abrasive slurry onto the contacting surface of the production tool; and
(iii) causing the abrasive slurry on the contacting surface of the production tool to come into contact with the first major surface of the backing; and
(b) the step of at least partially curing the binder precursor to form an abrasive article comprises:
(i) at least partially curing the binder precursor to form a shaped, handleable structure; and
(ii) separating the shaped, handleable structure from the production tool to form an abrasive article.

### Claim 10 (depends on 9)

The method of claim 9 which is a continuous process.

### Claim 11 (depends on 10)

The method of claim 10 wherein the continuous process is carried out at a line speed of at least about 25 meters/minute.

### Claim 12 (depends on 1)

The method of claim 1 wherein the first radiation curable component is an acrylate-functional compound.

### Claim 13 (depends on 12)

The method of claim 12 wherein the tie coat precursor comprises an acrylate monomer and an isocyanurate derivative having at least one pendant acrylate group.

### Claim 14 (depends on 1)

The method of claim 1 wherein the second radiation curable component is an acrylate-functional compound.

### Claim 15 (depends on 14)

The method of claim 14 wherein the binder precursor comprises an acrylate monomer and an isocyanurate derivative having at least one pendant acrylate group.

### Claim 16 (depends on 15)

The method of claim 15 wherein the fie coat precursor comprises an acrylate monomer and an isocyanurate derivative having at least one pendant acrylate group.

### Claim 17 (depends on 16)

The method of claim 16 wherein the tie coat precursor and binder precursor each further comprise a photoinitiator.

### Claim 18 (depends on 1)

An abrasive article made by the method of claim 1.

### Claim 19 (depends on 9)

An abrasive article made by the method of claim 9.

### Claim 20 (depends on 17)

An abrasive article made by the method of claim 17.

### Claim 21

A method of preparing an abrasive article, the method comprising:
(a) providing a treated cloth backing having a first major surface;
(b) coating the first major surface of the treated cloth backing with a tie coat precursor, wherein the tie coat precursor comprises a first radiation curable component;
(c) providing a radiation energy transmissive production tool having a contacting surface;
(d) applying an abrasive slurry onto the contacting surface of the production tool, wherein the abrasive slurry comprises a plurality of abrasive particles and a binder precursor, and further wherein the binder precursor comprises a second radiation curable component;
(e) causing the abrasive slurry on the contacting surface of the production tool to come into contact with the first major surface of the backing after coating the tie coat precursor thereon;
(f) at least partially curing the tie coat precursor;
(g) transmitting radiation energy through the production tool to at least partially cure the binder precursor to form a shaped, handleable structure; and
(h) separating the shaped, handleable structure from the production tool to form an abrasive article.

### Claim 22 (depends on 21)

The method of claim 21 wherein the step of at least partially curing the tie coat precursor is carried out prior to the step of causing the abrasive slurry on the contacting surface of the production tool to come into contact with the first major surface of the backing.

### Claim 23 (depends on 22)

The method of claim 22 wherein the step of at least partially curing the tie coat precursor comprises exposing the tie coat precursor to radiation energy.

### Claim 24 (depends on 21)

The method of claim 21 wherein the step of at least partially curing the tie coat precursor occurs when the step of transmitting energy through the production tool to at least partially cure the binder precursor is carried out.

### Claim 25 (depends on 24)

The method of claim 24 which is a continuous process carried out at a line speed of at least about 25 meters/minute.

### Claim 26

An abrasive article comprising:
(a) a cloth backing having a first major surface;
(b) a radiation cured tie coat on the first major surface of the backing; and
(c) an abrasive layer on the radiation cured tie coat, wherein the abrasive layer comprises a plurality of abrasive particles dispersed in a radiation cured binder.

### Claim 27 (depends on 26)

The article of claim 26 wherein the cloth backing comprises a treated cloth backing.

### Claim 28 (depends on 26)

The article of claim 26 which is a structured abrasive article.

### Claim 29 (depends on 26)

The article of claim 26 wherein the radiation cured tie coat is prepared from a tie coat precursor comprising an acrylate monomer and an isocyanurate derivative having at least one pendant acrylate group.

### Claim 30 (depends on 26)

The article of claim 26 wherein the radiation cured binder is prepared from a binder precursor comprising an acrylate monomer and an isocyanurate derivative having at least one pendant acrylate group.