EP0192047A2
Expired / Lapsed
EP
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Fixed abrasive polyurethane grinding media
Assignee: International Business Machines Corp
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Filing: 1986-01-17
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Granted: —
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Expires: 2006-01-17
Abstract
Abstract A fixed abrasive grinding media is disclosed which includes a high open cell content polyurethane foam binder in which is dispersed a high concentration, from 50 to 70% by weight, of abrasive particles. The binder system includes one or two hydrophilic polyols; an low molecular weight, highly reactive isocyanate; a surfactant that controls open cell formation; water and dual catalysts. One catalyst promotes the isocyanate-water reaction and the other promotes only the isocyanate-polyol reaction.
Inventors
- 👤 John Chen Shyan Shen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 18:33
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/02; B24D3/20; B24D3/28; B24D3/32; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/61
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
130 words
A high open cell microporous rigid polyurethane abrasive grinding media having abrasive particles dispersed in a typical thermosetting resin binder composition and formed as a molded abrasive foam media, wherein the media composition includes 50 to 70 percent by weight of abrasive particles and 30 to 50 percent by weight of binder, said binder being characterized in that it comprises: 20 to 60 parts by weight of polyisocyanate having at least two reactive sites per chain and, 10 to 60 parts by weight of polyols having average molecular weight of 1000 to 4000, said polyols including at least one hydrophilic polyol in a concentration no less than 10 percent by weight of the polyol content and additives including surfactant, water and catalysts not exceeding in total 20 parts by weight.
Claim 2
Dependent Claim
130 words
A high open cell microporous rigid polyurethane abrasive grinding media having abrasive particles dispersed in a typical thermosetting resin binder composition and formed as a molded abrasive foam media, wherein the media composition includes 50 to 70 percent by weight of abrasive particles and 30 to 50 percent by weight of binder, said binder being characterized in that it comprises: 20 to 60 parts by weight of polyisocyanate having at least two reactive sites per chain and, 10 to 60 parts by weight of polyols having average molecular weight of 1000 to 4000, said polyols including at least one hydrophilic polyol in a concentration no less than 10 percent by weight of the polyol content and additives including surfactant, water and catalysts not exceeding in total 20 parts by weight.
Claim 3
Dependent Claim
47 words
The abrasive medial composition of claim 1, wherein said surfactant is silicone oxyethylene copolymers represented by the formula: wherein R and R' are monovalent hydrocarbons and x is a positive integer preferably from 10 to 20 and y is a positive integer preferably from 2 to 10.
Claim 4
Dependent Claim
38 words
The abrasive media composition of claim 1 or 2, wherein . said catalysts are the mixture of organo metal catalyst and amine based catalyst in a mix ratio respectively from 9 to 1 up to 7 to 3.
Claim 5
Dependent Claim
27 words
The abrasive media composition of claim 3, wherein the said organo metal catalyst is selected from stannous octoate, dibutyltin dilaurate, lead octoate, phenylmercuric propionate and zinc chlordie.
Claim 6
Dependent Claim
34 words
The abrasive media composition of claim 3 or 4, wherein the said amine based catalyst is selected from N-methylamine, dimethylethanolamine, N, N, N', N'-tetramethyl ethylenediamine, 1,4-diazabicyclo (2,2,2) octane, triethylamine, dimethylethanolamine and 2,4,6-tris (dimethylaminomethyl) phenol.
Claim 7
Dependent Claim
31 words
The abrasive media composition according to anyone of the preceding claims wherein said polyisocyanate has an average molecular weight of 500 to 1000 and contains at least two reactive -NCO sites.
Claim 8
Dependent Claim
34 words
The abrasive media composition according to anyone of the preceiding claims wherein said hydrophilic polyol is selected from the group consisting of polyethylene glycols or polycaprolactone polyol having a hygroscopicity value greater than 30.
Claim 9
Dependent Claim
125 words
An open cell microporous rigid polyurethane abrasive grinding media having a mixture of abrasive particles dispersed in a typical thermosetting resin binder composition applied as a molded abrasive foam, wherein the media composition includes 50 to 70 percent by weight of mixed abrasive particles and 30 to 50 percent by weight of binder and characterized in that it comprises: 20 to 60 parts by weight of polyisocyanate; 10 to 60 parts by weight of polyols, wherein at least one of said polyols are polyethylene glycols or polycaprolactone polyol having a hygroscopicity value greater than 30, the weight portions of polyisocyanate and polyols components being such that the equivalent weight ratio of NCO/OH is between 1,05 and 1,2 and additives not exceeding 20 parts by weight.
Claim 10
Dependent Claim
125 words
An open cell microporous rigid polyurethane abrasive grinding media having a mixture of abrasive particles dispersed in a typical thermosetting resin binder composition applied as a molded abrasive foam, wherein the media composition includes 50 to 70 percent by weight of mixed abrasive particles and 30 to 50 percent by weight of binder and characterized in that it comprises: 20 to 60 parts by weight of polyisocyanate; 10 to 60 parts by weight of polyols, wherein at least one of said polyols are polyethylene glycols or polycaprolactone polyol having a hygroscopicity value greater than 30, the weight portions of polyisocyanate and polyols components being such that the equivalent weight ratio of NCO/OH is between 1,05 and 1,2 and additives not exceeding 20 parts by weight.
Claim 11
Dependent Claim
34 words
The abrasive media composition of claim 8, wherein said mixture of abrasive particles includes aluminum oxide and silicon carbide wherein each constituent is present in a concentration no greater that 90 percent by weight.
Claim 12
Dependent Claim
21 words
The abrasive media composition of claim 8 or 9, wherein said additives include water, silicone surfactant and a mixture of catalysts.
Claim 13
Dependent Claim
28 words
The abrasive media composition of claim 10, wherein the catalysts comprising said mixture of catalysts are selected from the group consisting of organo metal and amine based catalysts.
Claim 14
Dependent Claim
67 words
An open cell microporous rigid polyurethane abrasive grinding media characterized in that it comprises 50 to 70 percent by weight of abrasive particles dispersed in a typical thermosetting polyurethane resin binder composition formed as a molded abrasive foam, said the abrasive foam has density range from 0,15 to 0,30 gr/cm 3 10 to 30 pounds per cubic foot) with a greater than 80 percent open cell content.
Claim 15
Dependent Claim
67 words
An open cell microporous rigid polyurethane abrasive grinding media characterized in that it comprises 50 to 70 percent by weight of abrasive particles dispersed in a typical thermosetting polyurethane resin binder composition formed as a molded abrasive foam, said the abrasive foam has density range from 0,15 to 0,30 gr/cm 3 10 to 30 pounds per cubic foot) with a greater than 80 percent open cell content.
References Cited (Backward Citations)
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