US4613345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixed abrasive polishing media
Assignee: International Business Machines Corp
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Filing: 1985-08-12
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Granted: 1986-09-23
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Expires: 2005-08-12
Abstract
Abstract An improved method and formulation is shown for preparing polishing media for superfinishing pure metal surfaces. A combination of hydrophobic and hydrophilic silicone surfactants is used to control the porosity and water absorption during use whereby durability is obtained and the catalyst concentration is regulated to control hardness to achieve durability without scratching the workpiece. Density is controlled by the quantity of mixture with which a closed mold is charged. To produce successful media it is also necessary to preheat the closed mold and to be certain that the resin mixture of particles, polyol and additives does not exceed 120 degrees F. prior to final mixture with isocyanate just before charging the mold and curing. Also a longer cure at a lower temperature enhances the qualities of the resulting polishing media.
Inventors
- 👤 Ricky P. Thicke
- 👤 Stanley B. O'Brien
- 👤 David M. Nordyke
- 👤 Dennis L. Fox
- 👤 Thomas E. Folkert
- 👤 Bruce R. Diemer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:47
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/34; B24D3/342; B24D3/344; B24D3/02; B24D3/20; B24D3/28; B24D3/32; B24D3/346
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
116 words
The method of making a polishing pad for superfinishing metal substrate surfaces comprising fast mixing at a temperature of less than 120 degrees Fahrenheit the following ingredients in parts by weight: approximately 50 parts polyol approximately 100 parts abrasive particles 0.35 to 0.50 parts water 0.95 to 1.05 parts hydrophobic silicone surfactant 0.05 to 0.2 parts hydrophilic silicone surfactant 0.8 to 0.9 parts catalyst; preheating a mold to 85 to 105 degrees Fahrenheit; mixing the above initial mixture with approximately 50 parts by weight of isocyanate to form a final mixture and delivering said final mixture to said preheated mold; and curing said final mixture for 25 minutes at a temperature not exceeding 275 degrees Fahrenheit.
Claim 2
Independent Claim
116 words
The method of making a polishing pad for superfinishing metal substrate surfaces comprising fast mixing at a temperature of less than 120 degrees Fahrenheit the following ingredients in parts by weight: approximately 50 parts polyol approximately 100 parts abrasive particles 0.35 to 0.50 parts water 0.95 to 1.05 parts hydrophobic silicone surfactant 0.05 to 0.2 parts hydrophilic silicone surfactant 0.8 to 0.9 parts catalyst; preheating a mold to 85 to 105 degrees Fahrenheit; mixing the above initial mixture with approximately 50 parts by weight of isocyanate to form a final mixture and delivering said final mixture to said preheated mold; and curing said final mixture for 25 minutes at a temperature not exceeding 275 degrees Fahrenheit.
Claim 3
Dependent Claim
27 words
The method of making a polishing pad of claim 1 further comprising the step of quenching the cured, molded final mixture in water following the curing step.
Claim 4
Dependent Claim
22 words
The method of making a polishing pad of claim 2 wherein the water used in the initial mixing step is deionized water.
Claim 5
Dependent Claim
29 words
The method of making a polishing pad of claim 3 wherein the abrasive particles introduced during the initial mixing step are aluminum oxide not exceeding three microns in size.
Claim 6
Dependent Claim
28 words
The method of making a polishing pad of claim 1 wherein said fast mixing step and said curing step are separated by no more than 12 hours time.
Claim 7
Independent Claim
128 words
The method for making a polishing media for superfinishing metal substrate surfaces which has abrasive particles in a polyurethane binder comprising fast mixing abrasive particles, polyol and additives to form a resin; mixing said resin with isocyanate; and immediately forming the media in a closed preheated mold at a temperature no exceeding 275 degrees F. during cure; wherein said additives include an amine catalyst in an amount to cause the cured media to have a durometer of 30 to 65 durometer, Shore D and a combination of hydrophobic and hydrophilic silicone surfactants having a total weight of approximately 1% of the combined weight of the polyol and isocyanate constituents with said hydrophilic silicone surfactant component being about 10 to 15% by weight of the hydrophobic silicone surfactant component.
Claim 8
Independent Claim
128 words
The method for making a polishing media for superfinishing metal substrate surfaces which has abrasive particles in a polyurethane binder comprising fast mixing abrasive particles, polyol and additives to form a resin; mixing said resin with isocyanate; and immediately forming the media in a closed preheated mold at a temperature no exceeding 275 degrees F. during cure; wherein said additives include an amine catalyst in an amount to cause the cured media to have a durometer of 30 to 65 durometer, Shore D and a combination of hydrophobic and hydrophilic silicone surfactants having a total weight of approximately 1% of the combined weight of the polyol and isocyanate constituents with said hydrophilic silicone surfactant component being about 10 to 15% by weight of the hydrophobic silicone surfactant component.
Claim 9
Dependent Claim
26 words
The method of making a polishing media of claim 6 further comprising the step of quenching the cured, molded media in water following the curing step.
Claim 10
Dependent Claim
46 words
The method of making a polishing media of claim 7 wherein deionized water is included in the additives introduced during said fast mixing step in a quantity of 0.35 to 0.50 parts by weight per 100 parts by weight of the combined polyol and isocyanate constituents.
Claim 11
Dependent Claim
29 words
The method of making a polishing media of claim 8 wherein the abrasive particles introduced during the fast mixing step are aluminum oxide not exceeding three microns in size.
Claim 12
Dependent Claim
28 words
The method of making a polishing media of claim 6 wherein said fast mixing step and said forming step are separated by no more than 12 hours time.
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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) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |