Abrasive articles

• US 20020177387A1
• Filed: 05/22/2001
• Published: 11/28/2002
• Est. Priority Date: 05/22/2001
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Welygan, Dennis G., Keipert, Steven J., Moren, Louis S.
• Granted Patent: US 6,641,627 B2
• Time in Patent Office: Days
• US Class Current: 451/28
• CPC Class Codes: B24D 3/32 for porous or cellular structure
• CPC Class Codes: B24D 3/344 the bonding agent being organic
• CPC Class Codes: C08G 18/4825 Polyethers containing two hydroxy groups C08G18/4833 - C08G18/5096 take precedence

Abstract

Abrasive articles (e.g., abrasive wheels) comprised of abrasive particles and polymeric material such as a polymeric reaction product of components comprising saturated polyol, saturated polyisocyanate, and a free radical source, and methods of making and using the abrasive articles.

Claims

1. An abrasive article comprised of abrasive particles and polymeric reaction product of components comprising saturated polyol, saturated polyisocyanate, and a free radical source.

2. The abrasive article according to claim 1, which is an abrasive wheel.

3. The abrasive wheel according to claim 2 which has a void volume of at least 25 percent.

4. The abrasive wheel according to claim 2 having a void volume of at least 50 percent.

5. The abrasive wheel according to claim 2 having a void volume of in the range from 75 to 90 percent.

6. The abrasive wheel according to claim 5 wherein the free radical source includes peroxide.

7. The abrasive wheel according to claim 5 wherein the free radical source is selected from the group consisting of peroxide, azo compounds, persulfates, and combinations thereof.

8. The abrasive wheel according to claim 5 further comprised of lubricant.

9. The abrasive wheel according to claim 8 wherein the lubricant includes a lubricant selected from the group consisting of metallic salts of fatty acids, solid lubricants, esters of fatty acids, mineral oils and waxes, and combinations thereof.

10. The abrasive wheel according to claim 8 wherein the lubricant includes a lubricant selected from the group consisting of lithium stearate, zinc stearate, polytetrafluoroethylene, graphite, molydisulfide, butyl stearate, polydimethyl siloxane gum, and combinations thereof.

11. The abrasive wheel according to claim 8 wherein the abrasive grains include silicon carbide.

12. The abrasive wheel according to claim 5 wherein the free radical source is selected from the group consisting of peroxide, azo compounds, persulfates, and combinations thereof, and wherein the abrasive wheel is further comprised of lubricant.

13. The abrasive wheel according to claim 12 wherein the lubricant includes a lubricant selected from the group consisting of lithium stearate, zinc stearate, polytetrafluoroethylene, graphite, molydisulfide, butyl stearate, polydimethyl siloxane gum, and combinations thereof.

14. The abrasive wheel according to claim 12 wherein the lubricant includes a lubricant selected from the group consisting of lithium stearate, zinc stearate, and combinations thereof

15. The abrasive wheel according to claim 5, wherein the wheel has a density in the range from 0. 1 g/cm³ to 1.2 g/cm³, and a Shore A durometer value in the range from 10 to 50.

16. The abrasive article according to claim 5 wherein the polymeric reaction product has a T_g in the range from about −

60°

C. to about 50°

C.

17. The abrasive article according to claim 2 wherein the polymeric reaction product has a T_g in the range from about −

60°

C. to about 50°

C.

18. The abrasive article according to claim 17 wherein the polyisocyanate and polyol components provide an isocyanate index in the range from 80 to 120 and wherein the weight ratio of the free radical source to polymeric reaction product of the saturated polyol and saturated polyisocyanate is in the range from 1:

1000 to 1;

10.

19. The abrasive article according to claim 2 wherein the polyisocyanate and polyol components provide an isocyanate index in the range from 80 to 120 and wherein the weight ratio of the free radical source to polymeric reaction product of the saturated polyol and saturated polyisocyanate is in the range from 1:

1000 to 1;

10.

20. The abrasive article according to claim 1 wherein the polymeric reaction product has a T_g in the range from about −

60°

C. to about 50°

C.

21. The abrasive article according to claim 1 wherein the polyisocyanate and polyol components provide an isocyanate index in the range from 80 to 120 and wherein the weight ratio of the free radical source to polymeric reaction product of the saturated polyol and saturated polyisocyanate is in the range from 1:

1000 to 1;

10.

22. An abrasive article comprised of abrasive particles and polymeric material comprised of a saturated polyurethane preparable by combining components comprising saturated polyol, saturated polyisocyanate, and a free radical source.

23. The abrasive article according to claim 22, which is an abrasive wheel.

24. The abrasive wheel according to claim 23 having a void volume of at least 25 percent.

25. The abrasive wheel according to claim 23 having a void volume of at least 50 percent.

26. The abrasive wheel according to claim 23 having a void volume of in the range from 75 to 90 percent.

27. The abrasive wheel according to claim 26 wherein the free radical source includes peroxide.

28. The abrasive wheel according to claim 26 wherein the free radical source is selected from the group consisting of peroxide, azo compounds, persulfates, and combinations thereof.

29. The abrasive wheel according to claim 26 further comprised of lubricant.

30. The abrasive wheel according to claim 29 wherein the lubricant includes a lubricant selected from the group consisting of metallic salts of fatty acids, esters of fatty acids, solid lubricants, mineral oils and waxes, and combinations thereof.

31. The abrasive wheel according to claim 29 wherein the lubricant includes a lubricant selected from the group consisting of lithium stearate, zinc stearate, polytetrafluoroethylene, graphite, molydisulfide, butyl stearate, polydimethyl siloxane gum, and combinations thereof.

32. The abrasive wheel according to claim 29 wherein the abrasive grains include silicon carbide.

33. The abrasive wheel according to claim 25 wherein the free radical source is selected from the group consisting of peroxide, azo compounds, persulfates, and combinations thereof, and wherein the abrasive wheel is further comprised of lubricant.

34. The abrasive wheel according to claim 33 wherein the lubricant includes a lubricant selected from the group consisting of lithium stearate, zinc stearate, polytetrafluoroethylene, graphite, molydisulfide, butyl stearate, polydimethyl siloxane gum, and combinations thereof.

35. The abrasive wheel according to claim 33 wherein the lubricant includes a lubricant selected from the group consisting of lithium stearate, zinc stearate, and combinations thereof

36. The abrasive wheel according to claim 25, wherein the wheel has a density in the range from 0.1 g/cm³ to 1.2 g/cm³, and a Shore A durometer value in the range from 10 to 50.

37. The abrasive article according to claim 22 wherein the polymeric reaction product has a T_g in the range from about −

60°

C. to about 50°

C.

39. The method according to claim 38, wherein the components further comprise lubricant.

38. A method for making an abrasive article comprising:

combining components comprising saturated polyol, polyisocyanate, a free radical source, and abrasive grains to provide a curable composition; and

curing the curable composition to provide an abrasive article.

40. A method of abrading a surface, said method comprising:

providing an abrasive article comprised of abrasive particles and polymeric reaction product of components comprising saturated polyol, polyisocyanate, and a free radical source, the abrasive article having an outer surface;

frictionally contacting at least a portion of the outer surface of the abrasive article with a surface of a workpiece; and

moving at least of one the outer surface of the abrasive article or the surface of the workpiece relative to the other to abrade at least a portion of the workpiece surface.

41. The method according to claim 40 wherein a buffing compound is on at least a portion of the outer surface of the abrasive article.

42. The method according to claim 40, wherein the components further comprise lubricant.

43. A method of abrading a surface, said method comprising:

providing an abrasive article comprised of abrasive particles and polymeric material comprised of a saturated polyurethane preparable by combining components comprising saturated polyol, saturated polyisocyanate, and a free radical source, the abrasive article having an outer surface;

frictionally contacting at least a portion of the outer surface of the abrasive article with a surface of a workpiece; and

moving at least of one the outer surface of the abrasive article or the surface of the workpiece relative to the other to abrade at least a portion of the workpiece surface.

44. The method according to claim 43, wherein the components further comprise lubricant.