EP0103718A2
Expired / Lapsed
EP
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Low elasticity modulus fixed abrasive rigid grinding media and method of fabricating
Assignee: International Business Machines Corp
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Filing: 1983-08-02
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Granted: —
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Expires: 2003-08-02
Abstract
Abstract The grinding media is formed of a concentration of agglomerate free hard particles including at least 50 per cent 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 is pressurized to 4.0 to 8.5 bar. The water reacts during curing to create a polyurea linkage and release C0 2 as a blowing agent. The resulting media has a low elastic modulus with particles retained in a polyurethane-urea open cell foam binder system. The media composition may also include an inorganic filler such as glass fibers not exceeding 30 per cent by weight of the media.
Inventors
- 👤 John Chen Shyan Shen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 14:12
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: 14
Claim 1
Independent Claim
93 words
A low elastic modulus fixed abrasive rigid grinding media including at least 50 per cent by weight of classified abrasive particles not exceeding 50 / im in size which have been surface treated with a dispersant, that are uniformly dispersed and retained in a binder system formed of the reaction product of a multi functional polyisocyanate, a multi functional, low viscosity polyether polyol, and water, in an amount not exceeding 0.5 per cent by weight, characterized in that said binder system is a polyurethane-urea open cell foam formed in a pressurized closed mold.
Claim 2
Dependent Claim
93 words
A low elastic modulus fixed abrasive rigid grinding media including at least 50 per cent by weight of classified abrasive particles not exceeding 50 / im in size which have been surface treated with a dispersant, that are uniformly dispersed and retained in a binder system formed of the reaction product of a multi functional polyisocyanate, a multi functional, low viscosity polyether polyol, and water, in an amount not exceeding 0.5 per cent by weight, characterized in that said binder system is a polyurethane-urea open cell foam formed in a pressurized closed mold.
Claim 3
Dependent Claim
29 words
The grinding media of claim 1 wherein the binder system further includes tertiary amine type catalyst that forms at least 1.5 per cent of the binder system by weight.
Claim 4
Dependent Claim
56 words
The grinding media of claim 1 or 2 wherein the said polyisocyanate has a molecular weight of 120 to 160 per NCO group and each molecule has at least three reactive sites and the said polyether polyol has a molecular weight of 140 to 200 per reactive site with at least two reactive sites per chain.
Claim 5
Dependent Claim
43 words
The grinding media of any preceding claim wherein the binder system further includes a dispersing agent that comprises 0.5 to 1.0 per cent by weight of the binder system and serves to chelate the abrasive particles to obtain uniform suspension within the binder.
Claim 6
Dependent Claim
23 words
The grinding media of any preceding claim wherein the binder system further includes 0.1 to 0.5 per cent by weight of isopropyl alcohol.
Claim 7
Dependent Claim
30 words
The grinding media of any preceding claim wherein the binder system further includes a surfactant in the amount of 1.0 to 3.0 per cent by weight of the binder system.
Claim 8
Dependent Claim
25 words
The grinding media of any preceding claim further including an inorganic filler in an amount not exceeding 30 per cent by weight of the media.
Claim 9
Dependent Claim
20 words
The grinding media of any preceding claim wherein said classified abrasive particles have a size range of 20 to 40µm.
Claim 10
Independent Claim
114 words
The method of fabricating an abrasive grinding media including the steps of 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 characterized by the steps of placing the mixture in a mold which has been preheated to 40 to 70 o C; pressurizing the mold cavity to 4.0 to 8.5 bar 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 g·cm -3 .
Claim 11
Independent Claim
114 words
The method of fabricating an abrasive grinding media including the steps of 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 characterized by the steps of placing the mixture in a mold which has been preheated to 40 to 70 o C; pressurizing the mold cavity to 4.0 to 8.5 bar 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 g·cm -3 .
Claim 12
Dependent Claim
28 words
The method of claim 9 wherein said mixing step further includes a surfactant and said curing step occurs at a temperature of from 150 to 200 0 C.
Claim 13
Dependent Claim
30 words
ll. The method of claim 10 further comprising mixing an inorganic filler with said classified abrasive particles in an amount not exceeding 30 per cent by weight of the media.
Claim 14
Dependent Claim
63 words
The method of claim 10 wherein said mixing step comprises: 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 and wherein the cured material is quenched under cool water at 4 to 10 C .
References Cited (Backward Citations)
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