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EP0133141A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Filled and biaxially oriented polyester films and their use in the production of magnetic tapes

Assignee: Rhone Poulenc Films SA
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Filing: 1984-07-05
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Granted: —
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Expires: 2004-07-05
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Abstract

Abstract Translated from French La présente invention concerne des films en polyester, chargés et étirés biaxialement, qui présentent des propriétés de surface améliorées. Plus particulièrement ces films sont caractérisés en ce qu'ils comportent en poids par rapport au polyester: a) de 0,01 % à 1 % de kaolinite dont la dimension médiane des particules est inférieure ou égale à 1 micron, b) de 0,01 à 1 % d'oxyde de titane dont la dimension médiane des particules est inférieure ou égale à 1 micron. Ces films servent notamment, après revêtement d'une de leurs faces par des composés métalliques appropriés, à la fabrication de bandes magnétiques. The present invention relates to polyester films, loaded and biaxially stretched, which have improved surface properties. More particularly, these films are characterized in that they comprise by weight relative to the polyester: a) from 0.01% to 1% of kaolinite whose median particle size is less than or equal to 1 micron, b) from 0, 01 to 1% of titanium oxide whose median particle size is less than or equal to 1 micron. These films are used in particular, after coating one of their faces with suitable metallic compounds, for the manufacture of magnetic tapes.

Inventors

  • 👤 Jacques Barbey
  • 👤 Marie-Odile Jaquier

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-06 13:35
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/34; C08K3/346; G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; G11B5/73935; C08J2367/00; C08J2367/02; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24612; Y10T428/25; Y10T428/252; Y10T428/256; Y10T428/26; Y10T428/269; Y10T428/31504; Y10T428/31786

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

US3221226A Cited
JPS5374126A Cited
JPS53114894A Cited
EP0066997A1 Cited

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