EP0401689A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Biaxially oriented polyester film
Assignee: Mitsubishi Chemical Corp
•
Filing: 1990-05-31
•
Granted: —
•
Expires: 2010-05-31
Abstract
Abstract A biaxially oriented polyester film containing 0.05 to 3 wt% of agglomerates of primary particles of aluminuin oxide having an average particle size of 5 to 40 nm, the agglomerates having an average particle size of 50 to 400 nm. The film of the present invention is excellent in the wear resistance against various members sub as a metal pin, and suitable for various industrial purposes including a base film of a magnetic recording medium.
Inventors
- 👤 Seiji Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 02:16
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; G11B5/73929; C08J2367/00; C08J2367/02; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/256; Y10T428/257; Y10T428/259; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
45 words
A biaxially oriented polyester film containing 0.05 to 3 wt% based on the film of agglomerates of the primary particles of aluminum oxide having an average particle size of 5 to 40 nm, said agglomerates having an average particle size of 50 to 400 nm.
Claim 2
Dependent Claim
45 words
A biaxially oriented polyester film containing 0.05 to 3 wt% based on the film of agglomerates of the primary particles of aluminum oxide having an average particle size of 5 to 40 nm, said agglomerates having an average particle size of 50 to 400 nm.
Claim 3
Dependent Claim
35 words
A biaxially oriented polyester film according to claim 1, wherein the film further contains 0.01 to 1 wt% based on the film of deposited particles having an average particle size of 0.1 to 5 µm
Claim 4
Dependent Claim
31 words
A biaxially oriented polyester film according to claim 1, wherein the film further contains 0.05 to 2 wt% of additive particles having an average particle size of 0.1 to 3 µm.
Claim 5
Dependent Claim
35 words
A biaxially oriented polyester film according to claim 1, wherein the film further contains 0.01 to 3 wt% of fine powders of a heat-resistant polymer having an average particle size of 0.05 to 5 µm.
Claim 6
Dependent Claim
38 words
A biaxially oriented polyester film according to claim 1, wherein said polyester film is a polyethylene terephthalate film in which the F-5 value in either the machine direction or the transverse direction is not less than 12.0 kg/mm².
Claim 7
Dependent Claim
38 words
A biaxially oriented polyester film according to claim 1, wherein said polyester film is a polyethylene 2,6-naphthalate film in which the F-5 value in either the machine direction or the transverse direction is not less than 15.0 kg/mm².
References Cited (Backward Citations)
EP0345644A2
Cited
EP0351858A1
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.