Patent US4613520A successfully refreshed from Google Patents.
US4613520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating compositions
Assignee: Hercules LLC
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Filing: 1985-01-25
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Granted: 1986-09-23
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Expires: 2005-01-25
Abstract
Abstract Described are coating compositions having improved antistatic properties and particularly magnetic coating compositions suitable for magnetic recording media. The compositions comprise at least one film-forming synthetic resin and, based on coating solids, from about 0.2 to about 10% of an alkali, alkaline earth, ammonium or amine salt of a perfluoroalkyl sulfonic acid or carboxylic acid.
Inventors
- 👤 Sunil P. Dasgupta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:43
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/708; Y; Y10; Y10S; Y10S524/00; Y10S524/91; Y10S524/911
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
An antistatic coating composition comprising a film-forming synthetic resin component, a solvent or solvent system for the resin component, acicular particles of magnetic iron oxide and as the sole antistatic agent, from about 0.2 to about 10% based on coating solids of an alkali or alkaline earth metal, ammonium or amine salt of a perfluoroalkyl sulfonic acid or carboxylic acid having the formula CF 3 (CF 2 ) n SO 3 H or CF 3 (CF 2 ) n COOH where n is 0 to 5.
Claim 2
Dependent Claim
86 words
An antistatic coating composition comprising a film-forming synthetic resin component, a solvent or solvent system for the resin component, acicular particles of magnetic iron oxide and as the sole antistatic agent, from about 0.2 to about 10% based on coating solids of an alkali or alkaline earth metal, ammonium or amine salt of a perfluoroalkyl sulfonic acid or carboxylic acid having the formula CF 3 (CF 2 ) n SO 3 H or CF 3 (CF 2 ) n COOH where n is 0 to 5.
Claim 3
Dependent Claim
63 words
A process for reducing the surface electrical resistivity of a polypropylene or polyethylene terephthalate sheet or film normally subject to static build-up, which process comprises applying to at least one surface of said sheet or film the coating composition of claim 1 and removing the solvent from the composition to form a dry magnetic layer on the surface of the sheet or film.
Claim 4
Dependent Claim
12 words
The composition of claim 1 wherein the salt is a lithium salt.
Claim 5
Dependent Claim
16 words
The composition of claim 3 wherein the salt is the lithium salt of trifluoromethane sulfonic acid.
Claim 6
Dependent Claim
32 words
A plastic article having reduced surface electrical resistivity, said article comprising a plastic substrate having on at least one of its surfaces a coating layer derived from the composition of claim 3.
Claim 7
Dependent Claim
19 words
The plastic article of claim 5 wherein the substrate is a sheet or film of polypropylene or polyethylene terephthalate.
Claim 8
Dependent Claim
15 words
The composition of claim 3 wherein the salt is the lithium salt of trifluoroacetic acid.
Claim 9
Dependent Claim
12 words
The composition of claim 1 wherein the salt is diethylamine trifluoromethane sulfonate.
Claim 10
Dependent Claim
16 words
The composition of claim 1 wherein the salt is the magnesium salt of trifluoromethane sulfonic acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |