Shaped abrasive particles with low roundness factor
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B24B-001/00
B24D-011/00
C09K-003/14
C01F-007/02
C04B-035/111
C04B-035/628
출원번호
US-0570067
(2009-09-30)
등록번호
US-10137556
(2018-11-27)
발명자
/ 주소
Erickson, Dwight D.
출원인 / 주소
3M INNOVATIVE PROPERTIES COMPANY
인용정보
피인용 횟수 :
0인용 특허 :
83
초록▼
Shaped abrasive particles comprising alpha alumina and having a cross-sectional shape along a longitudinal axis of the shaped abrasive particles, the cross-sectional shape comprising a non-circular cross-sectional plane, and the shaped abrasive particles comprise an Average Roundness Factor of betwe
Shaped abrasive particles comprising alpha alumina and having a cross-sectional shape along a longitudinal axis of the shaped abrasive particles, the cross-sectional shape comprising a non-circular cross-sectional plane, and the shaped abrasive particles comprise an Average Roundness Factor of between about 15% to 0%.
대표청구항▼
1. Shaped abrasive particles comprising alpha alumina made from a dispersion of aluminum oxide monohydrate and having a cross-sectional shape along a longitudinal axis of the shaped abrasive particles, the cross-sectional shape comprising a noncircular cross-sectional plane, the shaped abrasive part
1. Shaped abrasive particles comprising alpha alumina made from a dispersion of aluminum oxide monohydrate and having a cross-sectional shape along a longitudinal axis of the shaped abrasive particles, the cross-sectional shape comprising a noncircular cross-sectional plane, the shaped abrasive particles comprising an Average Roundness Factor of between about 15% to 0% for the transverse cut, C, of the cross-sectional shape along the longitudinal axis, the shaped abrasive particles comprising an average tip radius of a cross-section of a first and a second face separated by a thickness t ranging from about 25 μm to about 500 μm and the average tip radius is less than 75 microns, and wherein the shaped abrasive particles exhibit a better cut rate during grinding than corresponding shaped abrasive particles having a higher Average Roundness Factor. 2. The shaped abrasive particles of claim 1 comprising the first face and the second face connected to each other by a sidewall; anda draft angle a is defined between the second face and the sidewall. 3. The shaped abrasive particles of claim 2 wherein a perimeter of the first face and the second face comprises a substantially triangular shape. 4. The shaped abrasive particles of claim 1, 2, or 3 wherein the cross-sectional shape comprises a rectangle. 5. The shaped abrasive particles of claim 1, 2, or 3 wherein the cross-sectional shape comprises a trapezoid. 6. The shaped abrasive particles of claim 5 wherein the draft angle a is between about 95 degrees to about 130 degrees. 7. The shaped abrasive particles of claim 1 comprising a volumetric aspect ratio and the volumetric aspect ratio is greater than about 1.15. 8. The shaped abrasive particles of claim 1, 2, 3, or 7 wherein the Average Roundness Factor is between about 12% to about 5%. 9. The shaped abrasive particles of claim 1 comprising a binder forming an abrasive article selected from the group consisting of bonded abrasive articles, coated abrasive articles, nonwoven abrasive articles, and abrasive brushes. 10. A coated abrasive article comprising the shaped abrasive particles of claim 1, 2, 3, or 7 and a make coat on a first major surface of a backing and a majority of the shaped abrasive particles adhered to the make coat by the sidewall, the shaped abrasive particles forming an abrasive layer, the abrasive layer coated with a size coat, wherein the abrasive layer comprises at least 5 percent by weight of the shaped abrasive particles, and wherein the coated abrasive article exhibits a better cut rate during grinding than a corresponding coated abrasive article having shaped abrasive particles having a higher Average Roundness Factor greater than about 15%. 11. The coated abrasive article of claim 10 wherein a majority of the shaped abrasive particles are adhered to the make coat by the sidewall, and have an orientation angle β between about 50 degrees to about 85 degrees. 12. The coated abrasive article of claim 11 wherein the abrasive layer is an open coat abrasive layer and a percent open area in the abrasive layer is between about 40% to about 70%. 13. The coated abrasive article of claim 12 wherein the abrasive layer comprises 100% by weight of the shaped abrasive particles. 14. The coated abrasive article of claim 12 wherein the orientation angle β is between about 70 degrees to about 85 degrees. 15. A coated abrasive article comprising: shaped abrasive particles comprisingalpha alumina made from a dispersion of aluminum oxide monohydrate and having a cross-sectional shape along a longitudinal axis of the shaped abrasive particles,the cross-sectional shape comprising a noncircular cross-sectional plane,the shaped abrasive particles comprising an Average Roundness Factor of between about 15% to 0% for the transverse cut, C, of the cross-sectional shape along the longitudinal axis,the shaped abrasive particles comprising an average tip radius of a cross-section of the first or second face and the average tip radius of less than 75 microns and a thickness t ranging from about 25 μm to about 500 μm;a make coat on a first major surface of a backing with a majority of the shaped abrasive particles adhered to the make coat by the sidewall, the shaped abrasive particles forming an abrasive layer, wherein the abrasive layer comprises at least 5 percent by weight of the shaped abrasive particles; anda size coat coated on the abrasive layer;wherein the coated abrasive article exhibits a better cut rate during grinding than a corresponding coated abrasive article having shaped abrasive particles having a higher Average Roundness Factor greater than about 15%. 16. The coated abrasive article of claim 15, wherein the abrasive layer is an open coat abrasive layer and a percent open area in the abrasive layer is between about 40% to about 70%. 17. The coated abrasive article of claim 15, wherein the abrasive layer comprises 100% by weight of the shaped abrasive particles. 18. The coated abrasive article of claim 15, wherein a majority of the shaped abrasive particles are adhered to the make coat by the sidewall, and have an orientation angle β between about 50 degrees to about 85 degrees. 19. The coated abrasive article of claim 15, wherein the make coat and the size coat independently comprise a binder. 20. The shaped abrasive particles of claim 2, wherein the draft angle α is about 90 degrees.
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