EP0395088A2
Expired / Lapsed
EP
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Coated abrasive material
Assignee: Saint Gobain Abrasives Inc
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Filing: 1990-04-27
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Granted: —
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Expires: 2010-04-27
Abstract
Abstract Coated abrasive materials having abrasive filaments of polycrystalline alumina.
Inventors
- 👤 Robert G. Kelly
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 01:28
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1436; B; B24; B24D; B24D11/00; B24D3/00
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
83 words
Coated abrasive material (10) comprising: a. a backing member (12), and b. a layer of coated abrasive (14) comprising: 1. a maker coat (16), and 2. a layer of a plurality of preshaped filamentary abrasive particles (18) having a substantially uniform cross-section adhered to said backing member by said maker coat, said abrasive particles each being of a substantially uniform cross-section with an aspect ratio of at least 1 and comprising sintered alpha alumina crystals having a size no greater than 2 µm.
Claim 2
Dependent Claim
83 words
Coated abrasive material (10) comprising: a. a backing member (12), and b. a layer of coated abrasive (14) comprising: 1. a maker coat (16), and 2. a layer of a plurality of preshaped filamentary abrasive particles (18) having a substantially uniform cross-section adhered to said backing member by said maker coat, said abrasive particles each being of a substantially uniform cross-section with an aspect ratio of at least 1 and comprising sintered alpha alumina crystals having a size no greater than 2 µm.
Claim 3
Dependent Claim
32 words
Coated abrasive material according to claim 1 wherein the said abrasive particles comprise sol gel alpha aluminum crystals with a density of at least about 90%, preferably 95% of the theoretical density.
Claim 4
Dependent Claim
23 words
Coated abrasive material according to claim 1 or 2 wherein the said abrasive particles have a hardness of at least about 16 GPa.
Claim 5
Dependent Claim
19 words
Coated abrasive material according to one of the preceding claims wherein the filamentary abrasive particles have a round cross-section.
Claim 6
Dependent Claim
30 words
Coated abrasive material according to one of the preceding claims wherein the said filament-shaped particles on the said backing member have an average aspect ratio of at least about 2:1
Claim 7
Dependent Claim
24 words
Coated abrasive material according to one of the preceding claims wherein the hardness of the said abrasive filaments is at least about 18 GPa.
Claim 8
Dependent Claim
45 words
Coated abrasive material according to one of the preceding claims wherein each abrasive filament has a diameter of from about 0.05 to about 0.5 mm and/or said alpha alumina crystals are seeded sol gel crystals and have a size no greater than about 1 µm.
Claim 9
Dependent Claim
35 words
Coated abrasive material according to one of the preceding claims wherein said filament shaped alumina abrasive particles comprise at least 95% of generally equiaxed crystals having a crystal size no greater than about 0.5 µm.
Claim 10
Dependent Claim
24 words
Coated abrasive material according to one of the preceding claims in which the filamentary particles have a breaking strength of at least 8,000 kg./cm².
Claim 11
Dependent Claim
50 words
Coated abrasive material according to one of the preceding claims wherein the said preshaped abrasive particles are abrasive filaments and include up to 15% by weight of a member selected from the group consisting of spinel, mullite, manganese dioxide, titania, magnesia, ceria, zirconia, precursors of said oxides and mixtures thereof.
Claim 12
Dependent Claim
30 words
Coated abrasive material according to one of the preceding claims wherein said alpha alumina crystals are seeded sol gel alphla alumina crystals having a size of less than 1 µm.
Claim 13
Dependent Claim
29 words
Coated abrasive material according to one of the preceding claims wherein at least some of the said filament shaped alumina based abrasive particles are curved in their longer dimension.
Claim 14
Dependent Claim
25 words
Coated abrasive material according to one of the preceding claims wherein at least some of the said abrasive filaments are twisted in their longer dimension
Claim 15
Dependent Claim
33 words
Coated abrasive material according to one of the preceding claims wherein the said preshaped abrasive particles are abrasive filaments of circular cross-section, each said filament having a diameter of preferably approximately 0.33 mm.
Claim 16
Dependent Claim
39 words
Coated abrasive material according to one of the preceding claims wherein the surface of the backing member receives from about 40 to 60% of the theoretical weight of the filamentary sintered alumina particles required to form a closed coat.
Claim 17
Dependent Claim
31 words
Coated abrasive product according to one of the preceding claims in which a plurality of layers of abrasive are used and at least the last-applied layer comprises the filamentary abrasive particles.
Claim 18
Dependent Claim
33 words
Coated abrasive material according to one of the preceding claims in which the layer of coated abrasive comprises up to 40%, based on the weight of the abrasive present of non-filamentary abrasive particles.
Claim 19
Dependent Claim
37 words
Coated abrasive material according to one of the preceding claims in which at least a portion of the filamentary particles, when in use, have a rake angle with respect to a work piece of close to zero.
Claim 20
Dependent Claim
34 words
Coated abrasive material according to one of the preceding claims in which at least a portion of the filamentary particles are in groups in which the component filaments lay against and buttress one another.
Claim 21
Dependent Claim
25 words
Coated abrasive material according to one of the preceding claims in which a layer comprising a grinding aid is applied to the coated abrasive layer.
Claim 22
Dependent Claim
33 words
Coated abrasive material according to one of the preceding claims wherein a size coat (20) is applied after application of the abrasive particles and the maker and size coats comprise a phenolic resin.
Claim 23
Dependent Claim
24 words
Coated abrasive material according to one of the preceding claims wherein the abrasive product is a disc and the backing member is vulcanized fiber.
Claim 24
Dependent Claim
25 words
Coated abrasive material according to one of the preceding claims wherein the abrasive filaments have an average aspect ratio of from about 2:1 to 8:1.
References Cited (Backward Citations)
No citation records indexed.
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