# US 11,078,345 B2 · Pore inducer and porous abrasive form made using the same

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- Number: US 11,078,345 B2
- Document ID: US11078345B2
- Status: Granted
- Kind: B2
- Application number: 16/099,728
- Filed: 2017-05-11
- Published: 2019-06-20
- Granted: 2021-08-03
- Earliest claimed: 2016-05-20
- Assignees: 3M Innovative Properties Company
- Applicants: 3M Innovative Properties Company
- Inventors: Brian D. Goers; Mark A. Lukowski; Walter Flaschberger; Ernest L. Thurber; John E. Gozum
- Web page: https://patentgrep.com/patent/US11078345B2

## CPC

- C08J 9/26: by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
- B24D 3/10: for porous or cellular structure, e.g. for use with diamonds as abrasives
- B24D 3/18: for porous or cellular structure
- B24D 3/32: for porous or cellular structure
- B24D 18/00: Manufacture of grinding tools {or other grinding devices}, e.g. wheels, not otherwise provided for
- B24D 18/0009: {using moulds or presses}
- C08F 20/00: Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F 122/14: Esters having no free carboxylic acid groups
- C08J 2201/042: Elimination of an organic solid phase
- C08J 2201/0442: the inorganic phase being a metal, its oxide or hydroxide
- C08J 2205/10: Rigid foams
- C08J 2333/00: Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J 2335/02: Characterised by the use of homopolymers or copolymers of esters (C08J2335/06, C08J2335/08 take precedence)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- 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)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Various embodiments disclosed relate to pore inducers and porous abrasive forms made using the same. In various embodiments, the present invention provides a method of forming a porous abrasive form including heating an abrasive composition including pore inducers to form the porous abrasive form. During the heating the pore inducers in the porous abrasive form reduce in volume to form induced pores in the porous abrasive form.

## Claims

### Claim 1

A method of forming a porous vitreous abrasive form, the method comprising:
molding a pore inducer staring material composition to form a plurality of hollow glass filler pore inducers with a 3D geometric shape and a size, wherein each of the plurality of pore inducers have the same 3D geometric shape and size;
heating an abrasive composition comprising pore inducers comprising the molded hollow glass filler pore inducers, to form the porous vitreous abrasive form; and
wherein during the heating the pore inducers in the porous vitreous abrasive form reduce in volume to form induced pores in the porous vitreous abrasive form, wherein the induced pores comprise a shape similar to the 3D geometric shape.

### Claim 2 (depends on 1)

The method of claim 1, wherein the pore inducers comprise a heat-volatile, heat-decomposable, or heat-pyrolizable component.

### Claim 3 (depends on 1)

The method of claim 1, wherein the abrasive composition, further comprises a secondary pore inducer.

### Claim 4 (depends on 1)

The method of claim 1, wherein the porous vitreous abrasive form has a density of about 1.3 g/cm3 to about 2.7 g/cm3.

### Claim 5 (depends on 1)

The method of claim 1, wherein the pore inducers are tetrahedrons, square pyramids, hexagonal pyramids, cubes, cuboids, triangular prisms, octahedrons, pentagonal prisms, hexagonal prisms, dodecahedrons, spheres, ellipsoids, icosahedron, cones, cylinders, sections of any one thereof or any combination thereof.

### Claim 6 (depends on 1)

The method of claim 1, wherein during the heating one or more components of the pore inducers melt or become flowable.

### Claim 7 (depends on 1)

The method of claim 1, wherein the induced pores approximately correspond in size to that of the molded pore inducers in the abrasive composition prior to the heating.

### Claim 8 (depends on 7)

The method of claim 7, wherein the induced pores have a volume that is about 50% to about 100% of the volume of the molded pore inducers in the abrasive composition prior to the heating.

### Claim 9 (depends on 7)

The method of claim 7, wherein the induced pores have a volume that is about 70% to about 95% of the volume of the molded pore inducers in the abrasive composition prior to the heating.