US4396657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fray and stretch resistant coated abrasive substrates impregnated with epoxy resins cured by specific types of catalysts
Assignee: Saint Gobain Abrasives Inc
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Filing: 1981-12-28
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Granted: 1983-08-02
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Expires: 2001-12-28
Abstract
Abstract Yarn arrays bonded with selected adhesives give coated abrasive products with reduced elongation under stress. Best results are obtained using epoxy resins with dicyandiamide, blocked isocyanates and/or imidazole curing agents as saturants for the yarn arrays.
Inventors
- 👤 Mohamed M. Ibrahim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:21
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/001; B24D3/002; C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/50; C08G59/56; C08J; C08J5/00; C08J5/24; C08J5/246; C08J5/249; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1369; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24099; Y10T428/24355; Y10T428/24372; Y10T428/24413; Y10T428/24421; Y10T428/31504; Y10T428/31511; Y10T442/00; Y10T442/20; Y10T442/2041; Y10T442/2049; Y10T442/2057; Y10T442/2066
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
In a coated abrasive product having a backing comprising continuous synthetic multifilament yarns, the improvement wherein said continuous synthetic multifilament yarns are impregnated to an extent of at least 15% of the mass of the yarns with a material which is the cured product of a liquid saturant comprising: (a) an epoxide resin with an epoxide equivalent weight between 150 and 600; and (b) a curing agent selected from the group consisting of (i) an amount of dicyandiamide within the range of 15-100 grams for each epoxide gram equivalent weight present in the epoxide resin specified in part (a), (ii) an amount of imidazole or alkyl or aryl substituted imidazole corresponding to from 1 to 5 percent by weight of the amount of epoxide resin specified in part (a), and (iii) an amount of an organic compound comprising at least two reversibly blocked isocyanate groups per molecule corresponding to from 5 to 20 percent by weight of the amount of epoxide resin specified in part (a).
Claim 2
Dependent Claim
166 words
In a coated abrasive product having a backing comprising continuous synthetic multifilament yarns, the improvement wherein said continuous synthetic multifilament yarns are impregnated to an extent of at least 15% of the mass of the yarns with a material which is the cured product of a liquid saturant comprising: (a) an epoxide resin with an epoxide equivalent weight between 150 and 600; and (b) a curing agent selected from the group consisting of (i) an amount of dicyandiamide within the range of 15-100 grams for each epoxide gram equivalent weight present in the epoxide resin specified in part (a), (ii) an amount of imidazole or alkyl or aryl substituted imidazole corresponding to from 1 to 5 percent by weight of the amount of epoxide resin specified in part (a), and (iii) an amount of an organic compound comprising at least two reversibly blocked isocyanate groups per molecule corresponding to from 5 to 20 percent by weight of the amount of epoxide resin specified in part (a).
Claim 3
Dependent Claim
20 words
In a coated abrasive product as in claim 1 wherein the epoxide resin has an epoxide equivalent weight of 200.
Claim 4
Dependent Claim
41 words
In a coated abrasive product as in claim 1, wherein the epoxide resin is an aqueous dispersion of an epichlorohydrin and bisphenol A condensate with an average of 3 epoxide groups per molecule and an epoxide equivalent weight of approximately 200.
Claim 5
Dependent Claim
16 words
In a coated abrasive product as in claim 1, wherein the curing agent is 2-Phenyl Imidazole.
Claim 6
Dependent Claim
35 words
In a coated abrasive product as in claim 4, wherein the amount of curing agent is in the range of 1 to 10% by weight of the epoxide resin solids present in the adhesive composition.
Claim 7
Dependent Claim
61 words
In a coated abrasive product as in claim 1, wherein the epoxide resin is an aqueous dispersion of epichlorohydrin and bisphenol A with an average of 2 epoxide groups per molecule, an epoxide equivalent weight of 500-600, and the curing agent is a combination of dicyandiamide and 2-methyl imidazole in a weight percentage ratio of 3.3:0.55 based on the epoxide resin.
Claim 8
Dependent Claim
17 words
A coated abrasive according to any one of claims 1-6 in the shape of an endless belt.
References Cited (Backward Citations)
US3030743A
Cited
US3631150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |