US5336079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biaxially oriented laminated film comprising particles in a specific ratio of particle density
Assignee: Toray Industries Inc
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Filing: 1992-03-04
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Granted: 1994-08-09
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Expires: 2012-03-04
Abstract
Abstract Disclosed is a biaxially oriented laminated film having at least three layers which has excellent abrasion resistance and electromagnetic conversion property when the film is used as the base film of a magnetic recording media. The biaxially oriented laminated film comprises at least one outermost layer containing particles A, the particle density ratio at surface layer of the particles A is not less than 0.01, and the mean primary particle size D of the particles A and the thickness T of the outermost layer containing the particles A satisfies the equation; D≦T≦200D.
Inventors
- 👤 Iwao Okazaki
- 👤 Koichi Abe
- 👤 Hidehito Minamizawa
- 👤 Takeo Fukuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:51
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/36; B32B27/18; G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; G11B5/73931; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/554; B32B2367/00; B32B2429/00; B32B2429/02; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/256; Y10T428/257; Y10T428/259; Y10T428/31
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
116 words
A biaxially oriented laminated film having at least three layers, wherein an outermost layer contains particles A, said particles A comprising primary particles and secondary particles the ratio of (a) the particle density of said particles A in said outermost layer at a depth of 3 nm to (b) the particle density of said particles A in said outermost layer at a depth of 30 nm being not less than 0.01, the ratio E/D of the mean secondary particle size E to the mean primary particle size D of the particles A being in the range of 2-60, and said mean primary particle size D and thickness T of the outermost layer satisfying the equation D<=T<=200D.
Claim 2
Dependent Claim
116 words
A biaxially oriented laminated film having at least three layers, wherein an outermost layer contains particles A, said particles A comprising primary particles and secondary particles the ratio of (a) the particle density of said particles A in said outermost layer at a depth of 3 nm to (b) the particle density of said particles A in said outermost layer at a depth of 30 nm being not less than 0.01, the ratio E/D of the mean secondary particle size E to the mean primary particle size D of the particles A being in the range of 2-60, and said mean primary particle size D and thickness T of the outermost layer satisfying the equation D<=T<=200D.
Claim 3
Dependent Claim
20 words
The biaxially oriented laminated film according to claim 1, wherein said layer containing the particles A is composed of polyester.
Claim 4
Dependent Claim
34 words
The biaxially oriented laminated film according to claim 1, wherein particles B having a mean particle size greater than that of the particles A are also contained in said layer containing the particles A.
Claim 5
Dependent Claim
36 words
The biaxially oriented laminated film according to claim 3, wherein the mean particle size D1 of the particles B and the thickness T of the layer containing the particles A and B satisfies the equation; 0.5D1≦T≦5D1.
Claim 6
Dependent Claim
28 words
The biaxially oriented laminated film according to claim 3, wherein the mean particle size D1 of the particles B is in the range of 0.1 to 2 μm.
Claim 7
Dependent Claim
35 words
The biaxially oriented laminated film according to claim 3, wherein the content of the particles A and B in said layer containing the particles B is in the range of 0.005 to 5% by weight.
Claim 8
Dependent Claim
30 words
The biaxially oriented laminated film according to claim 3, wherein the relative standard deviation of the distribution of the particle size of the particles B is not greater than 0.6.
Claim 9
Dependent Claim
30 words
The biaxially oriented laminated film according to claim 3, wherein said particles B are selected from the group consisting of calcium carbonate particles, crosslinked polymer particles and colloidal silica particles.
Claim 10
Dependent Claim
19 words
The biaxially oriented laminated film according to claim 8, wherein said calcium carbonate particles are of the vaterite structure.
Claim 11
Dependent Claim
46 words
The biaxially oriented laminated film according to claim 3, wherein particles C having a mean particle size greater than that of the particles A and smaller than that of the particles B are also contained in said layer containing the particles A and the particles B.
Claim 12
Dependent Claim
29 words
The biaxially oriented laminated film according to claim 1, wherein the mean primary particle size D of the particles A is in the range of 1 to 300 nm.
Claim 13
Dependent Claim
33 words
The biaxially oriented laminated film according to claim 1, wherein the content of the particles A in said layer containing the particles A is in the range of 0.01 to 2% by weight.
Claim 14
Dependent Claim
26 words
The biaxially oriented laminated film according to claim 1, wherein said particles A are selected from the group consisting of zirconia, chain-shaped silica and alumina particles.
Claim 15
Dependent Claim
24 words
The biaxially oriented laminated film according to claim 1, wherein said particles A form non-incorporated particles internally of which seeds are the particles A.
Claim 16
Dependent Claim
52 words
The biaxially oriented laminated film according to claim 1, wherein said biaxially oriented laminated film is a laminated film having at least four layers comprising an intermediate layer, cover layers laminated on both surfaces of the intermediate layer and said outermost layer being laminated on at least one of the cover layers.
Claim 17
Dependent Claim
22 words
The biaxially oriented laminated film according to claim 15, wherein the thickness of said intermediate layer is not less than 0.1 μm.
Claim 18
Dependent Claim
24 words
The biaxially oriented laminated film according to claim 15, wherein the thickness of each of said cover layers is not less than 0.2 μm.
Claim 19
Dependent Claim
37 words
The biaxially oriented laminated film according to claim 15, wherein each of said cover layers contains particles, and the content of said particles contained in each of said cover layers is not greater than 2% by weight.
Claim 20
Dependent Claim
32 words
The biaxially oriented laminated film according to claim 1, wherein the surface resistivity of at least one outermost layer of said biaxially oriented laminated film is not greater than 1×10 14 Ω/□.
Claim 21
Dependent Claim
43 words
The biaxially oriented laminated film according to claim 19, wherein a sulfate group compound is added to said at least one outermost layer with a surface resistivity of not greater than 1×10 14 Ω/□ at a content of 0.2 to 5% by weight.
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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) | 1997-08-08 | 1998-02-07 | 1998-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-08 | 2002-02-07 | 2002-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-08 | 2006-02-07 | 2006-08-09 | $7700.00 | Window Closed / Lapsed |