US4459779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixed abrasive grinding media
Assignee: International Business Machines Corp
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Filing: 1982-09-16
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Granted: 1984-07-17
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Expires: 2002-09-16
Abstract
Abstract The grinding media is formed of a concentration of agglomerate free hard particles exceeding 50 percent by weight of the media, wherein the particles are chelated by a dispersing agent, surface treated with a surfactant, mixed with polyether polyol and polyisocyanate plus a catalyst and water and thereafter rapidly cured in a closed mold which has been preheated to a temperature exceeding 50° C. and a pressure of 60 to 120 PSIG. The water reacts during curing to create a polyurea linkage and release CO 2 as a blowing agent. The resulting media has a low elastic modulus with particles retained in a polyurethane-urea binder system. The media composition may also include an inorganic filler such as glass fibers not exceeding 30 percent by weight of the media.
Inventors
- 👤 John C. S. Shen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:21
CPC Classifications
B; B24; B24D; B24D18/00; B24D3/00; B24D3/02; B24D3/20; B24D3/28; B24D3/32; B24D3/34; B24D3/342; B24D3/344
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
The method of fabricating an abrasive grinding media comprising: mixing classified abrasive particles which have been surface treated with a dispersing agent and from which agglomerates have been removed with multifunction, low viscosity polyether polyol; multi function polyisocyanate; water and a catalyst; placing the mixture in a mold which has been preheated to 40° to 70° C.; pressurizing the mold cavity to 60 to 120 pounds per square inch; and curing at a temperature of at least 150° C., whereby a fast reaction occurs at conditions of elevated temperature and pressure to produce a microstructure free of flow patterns with a density in excess of 0.5 gram per cubic centimeter.
Claim 2
Independent Claim
110 words
The method of fabricating an abrasive grinding media comprising: mixing classified abrasive particles which have been surface treated with a dispersing agent and from which agglomerates have been removed with multifunction, low viscosity polyether polyol; multi function polyisocyanate; water and a catalyst; placing the mixture in a mold which has been preheated to 40° to 70° C.; pressurizing the mold cavity to 60 to 120 pounds per square inch; and curing at a temperature of at least 150° C., whereby a fast reaction occurs at conditions of elevated temperature and pressure to produce a microstructure free of flow patterns with a density in excess of 0.5 gram per cubic centimeter.
Claim 3
Dependent Claim
30 words
The method of claim 1 wherein said mixing step further comprises the addition of a surfactant and said curing step occurs at a temperature of from 150° to 200° C.
Claim 4
Dependent Claim
28 words
The method of claim 2 further comprising mixing an inorganic filler with said classified abrasive particles in an amount not exceeding 30 percent by weight of the media.
Claim 5
Independent Claim
89 words
The method of fabricating an abrasive grinding media comprising: mixing classified hard particles in a multifunction polyether polyol and a dispersant until a uniform mixture is achieved; adding a surfactant and water to said mixture and mixing; adding a multifunction polyisocyanate and catalyst to said mixture; placing said mixture in a closed mold that has been preheated to 40° to 70° C.; curing the binder material at 60 to 120 psig and 150° to 200° C.; and quenching the cured material under cool water at 4° to 10° C.
Claim 6
Independent Claim
89 words
The method of fabricating an abrasive grinding media comprising: mixing classified hard particles in a multifunction polyether polyol and a dispersant until a uniform mixture is achieved; adding a surfactant and water to said mixture and mixing; adding a multifunction polyisocyanate and catalyst to said mixture; placing said mixture in a closed mold that has been preheated to 40° to 70° C.; curing the binder material at 60 to 120 psig and 150° to 200° C.; and quenching the cured material under cool water at 4° to 10° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |