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US4153754A Expired / Lapsed US ⏱️ 0.0 years remaining

Magnetic recording medium in which an N-acylsarcosine derivative is used as a dispersing agent

Assignee: US Philips Corp
•
Filing: 1978-04-10
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Granted: 1979-05-08
•
Expires: 1998-04-10
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Abstract

Abstract The invention relates to a magnetic recording medium, for example a magnetic tape, which comprises a carrier and a magnetizable coating provided thereon which comprises a binder as well as a magnetic pigment dispersed in the binder by means of a dispersing agent. As a dispersing agent is used an N-acylsarcosine derivative. Herewith an optimum dispersion of the pigment in the binder is obtained in a short dispersion time. An excess of dispersing agent serves as a lubricant upon migration. The acyl group comprises preferably an aliphatic or olefinic hydrocarbon chain having 12-22 carbon atoms. Furthermore are to be preferred salts of N-acrylsarcosine, in particular metal salts, alkali metal salts, alkaline earth metal salts and amine salts.

Inventors

  • 👤 Hendrikus Huisman

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 05:17
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/7013; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31609; Y10T428/31678; Y10T428/31725; Y10T428/31765; Y10T428/31786; Y10T428/31855; Y10T428/31935; Y10T428/31942; Y10T428/31971; Y10T428/31993; Y10T428/31996

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 41 words
A magnetic recording medium comprising a non-magnetic carrier and a magnetizable coating provided on said carrier, said magnetizable coating comprising a binder and magnetic pigments finely dispersed therein by means of a dispersing agent, said dispersing agent being an N-acylsarcosine derivative.
Claim 2
Dependent Claim 41 words
A magnetic recording medium comprising a non-magnetic carrier and a magnetizable coating provided on said carrier, said magnetizable coating comprising a binder and magnetic pigments finely dispersed therein by means of a dispersing agent, said dispersing agent being an N-acylsarcosine derivative.
Claim 3
Dependent Claim 32 words
The magnetic recording medium of claim 1, wherein the dispersing agent corresponds to the formula ##STR2## or salts thereof, wherein R is an aliphatic or olefinic hydrocarbon chain of 12-22 carbon atoms.
Claim 4
Dependent Claim 40 words
The magnetic recording medium of claim 2 wherein the dispersing agent is a alkali metal salt, an alkaline earth metal salt, a zinc salt, a copper salt, a lead salt or an amine salt of the N-acylsarcosine of claim 2.
Claim 5
Dependent Claim 21 words
The magnetic recording medium of claim 3 wherein the dispersing agent is a sodium salt of the N-acylsarcosine of claim 2.
Claim 6
Dependent Claim 33 words
The magnetic recording medium of claim 3 wherein the dispersing agent is an aliphatic or olefinic amine salt of the N-acylsarcosine wherein the amine moiety contains a hydrocarbon chain of 12-22 carbon atoms.
Claim 7
Dependent Claim 18 words
The magnetic recording medium of claim 3 wherein the dispersing agent is a triethanolamine salt of the N-acylsarcosine.
Claim 8
Dependent Claim 16 words
The magnetic recording medium of claim 1 wherein an excess of the dispersing agent is present.

References Cited (Backward Citations)

US3687725A Cited
US3647539A Cited
US3804810A Cited
US4063000A Cited
US4020236A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1982-05-07 1982-11-06 1983-05-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1986-05-07 1986-11-06 1987-05-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1990-05-07 1990-11-06 1991-05-08 $7700.00 Window Closed / Lapsed

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