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US5096773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biaxially oriented polyester film
Assignee: Diafoil Co Ltd
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Filing: 1990-06-01
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Granted: 1992-03-17
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Expires: 2010-06-01
Abstract
Abstract A biaxially oriented polyester film containing 0.05 to 3 wt % of agglomerates of primary particles of aluminum 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 such 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
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:40
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: 9
Claim 1
Independent Claim
54 words
A biaxially oriented polyester film containing about 0.05 to 3 wt % based on the film of agglomerates, the agglomerates consisting of primary aluminum oxide particles having an average particle size of from about 5 to 40 nm, and the agglomerates each having an average particle size of from about 50 to 400 nm.
Claim 2
Dependent Claim
54 words
A biaxially oriented polyester film containing about 0.05 to 3 wt % based on the film of agglomerates, the agglomerates consisting of primary aluminum oxide particles having an average particle size of from about 5 to 40 nm, and the agglomerates each having an average particle size of from about 50 to 400 nm.
Claim 3
Dependent Claim
25 words
The biaxially oriented polyester film according to claim 1, wherein the agglomerates each have an average particle size of from about 70 to 300 nm.
Claim 4
Dependent Claim
23 words
The biaxially oriented polyester film according to claim 1, wherein the primary aluminum oxide particle size is from about 5 to 20 nm.
Claim 5
Dependent Claim
39 words
The biaxially oriented polyester film according to claim 1, wherein the film further contains about 0.01 to 1 wt % based on the film of deposited particles having an average particle size of from about 0.1 to 5 μm.
Claim 6
Dependent Claim
36 words
The biaxially oriented polyester film according to claim 1, wherein the film further contains from about 0.05 to 2 wt % of additive particles having an average particle size of from about 0.1 to 3 μm.
Claim 7
Dependent Claim
43 words
The biaxially oriented polyester film according to claim 1, wherein the film further contains from about 0.01 to 3 wt % of fine powders of a heat-resistant polymer, the fine powders having an average particle size of from about 0.05 to 5 μm.
Claim 8
Dependent Claim
40 words
The biaxially oriented polyester film according to claim 1, wherein the 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 about 12.0 kg/mm 2 .
Claim 9
Dependent Claim
40 words
The biaxially oriented polyester film according to claim 1, wherein the 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 about 15.0 kg/mm 2 .
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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) | 1995-03-17 | 1995-09-16 | 1996-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-17 | 1999-09-16 | 2000-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-17 | 2003-09-16 | 2004-03-17 | $7700.00 | Window Closed / Lapsed |