US4084941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-polluting waterproof cloth finish for abrasive cloth
Assignee: Saint Gobain Abrasives Inc
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Filing: 1976-03-31
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Granted: 1978-04-18
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Expires: 1996-03-31
Abstract
Abstract A woven cellulosic cloth backing of cotton or rayon yarns for the manufacture of coated abrasives, particularly for the manufacture of coated abrasive belts for wet grinding, includes a backsize, of phenolic resin which may be admixed with a polymer having a glass transition temperature between 10° and 40° C, said backsize being directly adhered to the yarns of cloth, a polymeric film forming resin adhered to the yarns of cloth to which the backsize is not adhered, said resin having a glass transition temperature between 20° and 50° C, and a front size of a mixture of phenol-formaldehyde resin and the film former resin coating above referred to. An additional front coating of phenol-formaldehyde resin may be employed to provide a smooth surface for the application of a fine grit abrasive.
Inventors
- 👤 William H. Cox
- 👤 Norvell E. Wisdom, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:54
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/001; B24D3/002; B24D3/004; B24D11/00; B24D11/02; D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/41; D06M23/00; D06M23/16; D06M2101/00; D06M2101/02; D06M2101/04; D06M2101/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
202 words
A woven cellulosic fabric cloth backing having a weight of 4 to 9.5 oz/yd 2 for the manufacture of a coated abrasive sheet by the application to its front face of a mixture of abrasive and phenolic resin, having a cured phenol-formaldehyde backsize containing from 0 to 35% of an acrylic film forming polymer having a glass transition temperature between 10° and 40° C, said backsize lying on the cloth surface and penetrating only partially into the interstices of the yarns and being present in the amount of 3 to 10 pounds of dry coating per ream, the portion of the cloth not adhered to said backsize, being coated with an acrylic film forming polymer having a glass transition temperature of between 20° and 50° C, said last named polymer being present in the amount of from 0.5 to 4 pounds per ream, and a front size overlying said last named polymer consisting of 30 to 70% by weight of phenolic resin, and from 30 to 70% by weight of a film forming polymer having a glass transition temperature between 20° and 50° C, said front size being present in the amount of from 1 to 4 pounds per ream, dry weight.
Claim 2
Dependent Claim
202 words
A woven cellulosic fabric cloth backing having a weight of 4 to 9.5 oz/yd 2 for the manufacture of a coated abrasive sheet by the application to its front face of a mixture of abrasive and phenolic resin, having a cured phenol-formaldehyde backsize containing from 0 to 35% of an acrylic film forming polymer having a glass transition temperature between 10° and 40° C, said backsize lying on the cloth surface and penetrating only partially into the interstices of the yarns and being present in the amount of 3 to 10 pounds of dry coating per ream, the portion of the cloth not adhered to said backsize, being coated with an acrylic film forming polymer having a glass transition temperature of between 20° and 50° C, said last named polymer being present in the amount of from 0.5 to 4 pounds per ream, and a front size overlying said last named polymer consisting of 30 to 70% by weight of phenolic resin, and from 30 to 70% by weight of a film forming polymer having a glass transition temperature between 20° and 50° C, said front size being present in the amount of from 1 to 4 pounds per ream, dry weight.
Claim 3
Dependent Claim
35 words
A coated abrasive backing as in claim 1 having a phenol-formaldehyde layer overlying said front size for presentation of a smooth surface for the application of a phenolic bonding layer and a fine grit abrasive.
Claim 4
Dependent Claim
23 words
A coated abrasive sheet comprising the backing of claim 1 having abrasive grains adhered to the front side by a cured phenolic coating.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |