US4550049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated film and magnetic recording medium made therewith
Assignee: Toray Industries Inc
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Filing: 1983-03-09
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Granted: 1985-10-29
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Expires: 2003-03-09
Abstract
Abstract A laminated film comprising (A) a layer composed of a thermoplastic resin and (B) a layer composed of a thermoplastic resin containing fine particles therein, wherein a discontinuous skin having a height of 50 to 1,000 Å is formed on the outer surface of the layer (A) and the outer surface of the layer (B) has a surface Ra value of 0.005 to 0.040μ. The laminated film is very valuable as a base film of a magnetic recording tape having a ferromagnetic metal thin film formed on the surface of the layer (A), especially a video tape, because it has good running properties and is excellent in electromagnetic transformation performance.
Inventors
- 👤 Masaaki Ono
- 👤 Yasuki Miura
- 👤 Masahiko Motegi
- 👤 Kazuo Okabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:29
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; B32B15/00; B32B15/04; B32B15/08; B32B27/18; B32B27/36; B32B3/00; B32B3/26; B32B3/30; B32B2307/00; B32B2307/20; B32B2307/208; B32B2307/50; B32B2307/514; B32B2307/518; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/2438; Y10T428/24388; Y10T428/24405; Y10T428/24421; Y10T428/24446; Y10T428/24802; Y10T428/24851; Y10T428/24893; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31786; Y10T428/31797; Y10T428/31801
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
129 words
A laminated film for use in high-density, metallized magnetic recording media comprising (A) a layer composed of a thermoplastic resin and (B) a layer of a thermoplastic resin containing fine particles therein, wherein the outer surface of the layer (A) has a discontinuous skin having a height of 50 to 1,000Å, said discontinuous skin comprising a silicone resin, a silane coupling agent which is an organic silicon monomer having at least two different reactive groups in the molecule, and a water-soluble polymer having a molecular weight of from 10,000 to 2,000,000, wherein the ratio by weight of silicone resin/silane coupling agent/water-soluble polymer is in the range of (10-50)/ (5-150)/(10-200); wherein the outer surface of the layer (B) has a roughness, expressed as the Ra value, of 0.005 to 0.040μ.
Claim 2
Dependent Claim
129 words
A laminated film for use in high-density, metallized magnetic recording media comprising (A) a layer composed of a thermoplastic resin and (B) a layer of a thermoplastic resin containing fine particles therein, wherein the outer surface of the layer (A) has a discontinuous skin having a height of 50 to 1,000Å, said discontinuous skin comprising a silicone resin, a silane coupling agent which is an organic silicon monomer having at least two different reactive groups in the molecule, and a water-soluble polymer having a molecular weight of from 10,000 to 2,000,000, wherein the ratio by weight of silicone resin/silane coupling agent/water-soluble polymer is in the range of (10-50)/ (5-150)/(10-200); wherein the outer surface of the layer (B) has a roughness, expressed as the Ra value, of 0.005 to 0.040μ.
Claim 3
Dependent Claim
20 words
A laminated film as set forth in claim 1, wherein the height of the discontinuous skin is 80 to 300Å.
Claim 4
Dependent Claim
29 words
A laminated film as set forth in claim 1, wherein the roughness, expressed as the Ra value, of the outer surface of the layer (B) is 0.005 to 0.030μ.
Claim 5
Dependent Claim
19 words
A laminated film as set forth in claim 1, wherein the silane coupling agent is a mono- or di-organoalkoxysilane.
Claim 6
Dependent Claim
49 words
A laminated film as set forth in claim 1, wherein one of at least two different groups of the silane coupling agent is a group selected from methoxy, ethoxy and silanol groups and the other reactive group is a group selected from vinyl, epoxy, methacrylic, amino and mercapto groups.
Claim 7
Dependent Claim
19 words
A laminated film as set forth in claim 1, wherein the silane coupling agent is an aminosilane type compound.
Claim 8
Dependent Claim
37 words
A laminated film as set forth in claim 1, wherein the silane coupling agent is at least one organic silane compound selected from the group consisting of vinyltrichlorosilane, vinyltriethoxysilane, vinyltris(β-methoxyethoxy)silane, γ-methacryloxypropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, γ-chloropropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, and γ-aminopropyltriethoxysilane.
Claim 9
Dependent Claim
21 words
A laminated film as set forth in claim 1, wherein the molecular weight of the water-soluble polymer is 100,000 to 1,000,000.
Claim 10
Dependent Claim
39 words
A laminated film as set forth in claim 1, wherein the water-soluble polymer is at least one member selected from the group consisting of polyvinyl alcohol, tragacanth gum, gum arabic, casein, gelatin, methyl cellulose, hydroxyethyl cellulose, and carboxymethyl cellulose.
Claim 11
Dependent Claim
31 words
A laminated film as set forth in claim 1, wherein the water-soluble polymer is at least one member selected from the group consisting of methyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose.
Claim 12
Dependent Claim
25 words
A laminated film as set forth in claim 1, wherein each of the thermoplastic resin layers (A) and (B) is a biaxially oriented polyester film.
Claim 13
Dependent Claim
62 words
A laminated film as set forth in claim 1, wherein the outer surface of the layer (B) has a plurality of depressions and a plurality of protrusions which are formed in a configuration such that at least one protrusion exists within each depression or at least one protrusion exists in the area where two or more depressions are contiguous to each other.
Claim 14
Dependent Claim
28 words
A laminated film as set forth in claim 12, wherein the area fraction of said depressions is in the range of from 1×10 -3 to 6×10 -1 .
Claim 15
Dependent Claim
22 words
A laminated film as set forth in claim 1, which further comprises a ferro-magnetic metal thin film formed on the discontinuous skin.
Claim 16
Dependent Claim
22 words
A laminated film as set forth in claim 14, wherein the ferromagnetic metal thin film is a vacuum-deposited ferromagnetic metal thin film.
Claim 17
Dependent Claim
26 words
A laminated film as set forth in claim 14, wherein the ferromagnetic metal is at least one member selected from Fe, Co, Ni and alloys thereof.
Claim 18
Dependent Claim
24 words
A laminated film as set forth in claim 1, wherein the silicone resin is a polysiloxane having a molecular weight of 30,000 to 300,000.
Claim 19
Dependent Claim
89 words
A laminated film as set forth in claim 1 or 17, wherein the silicone resin is a compound which is represented by the following general formula: ##STR2## wherein R 1 is CH 3 , C 6 H 5 , or H, R 2 is CH 3 , C 6 H 5 , H, an epoxy group, an amino group, or a hydroxyl group, and n is a number of from 100 to 7,000, and has functional terminal groups selected from epoxy, amino, and hydroxyl groups at the ends thereof.
Claim 20
Dependent Claim
38 words
A laminated film as set forth in claim 1, wherein each of the thermoplastic resins in the layer (A) and the layer (B) at least one member selected from the group consisting of polyesters, polyamides, polycarbonates and polypropylenes.
Claim 21
Dependent Claim
26 words
A laminated film as set forth in claim 1, wherein each of the thermoplastic resins in the layer (A) and the layer (B) is a polyester.
Claim 22
Dependent Claim
37 words
A laminated film as set forth in claim 19 or 20, wherein the polyester is at least one member selected from the group consisting of polyethylene terephthalate, polytetramethylene terephthalate, poly-1,4-cyclohexylenedimethylene terephthalate, polyethylene-2,6-naphthalene dicarboxylate, polyethylene-p-hydroxybenzoate and copolymers thereof.
Claim 23
Dependent Claim
17 words
A laminated film as set forth in claim 19 or 20, wherein the polyester is polyethylene terephthalate.
Claim 24
Dependent Claim
30 words
A laminated film as set forth in claim 1, which further comprises a covering layer (C) comprising a lubricant, which is formed on the outer surface of the layer (B).
Claim 25
Dependent Claim
49 words
A laminated film as set forth in claim 23, wherein the covering layer (C) is a continuous film layer comprising a silicone resin, a surface active agent and a silane coupling agent wherein the silicone resin/surface active agent/silane coupling agent weight ratios are in the range of (10-100)/(5-20)/(5-100), respectively.
Claim 26
Dependent Claim
33 words
A laminated film as set forth in claim 24, wherein the covering layer (c) further comprises a wax, wherein the respective weight ratio of said wax is less than or equal to 200.
Claim 27
Dependent Claim
51 words
A laminated film as set forth in claim 23, wherein the covering layer (c) is a discontinuous film formed of worm-like nodules, which comprises a silicone resin, a silane coupling agent and a water-soluble polymer, wherein the silicone resin/silane coupling agent/water-soluble polymer weight ratios are in the range of (10-100)/(5-100)/(10-200), respectively.
Claim 28
Dependent Claim
33 words
A laminated film as set forth in claim 26, wherein the covering layer (c) further comprises a wax, wherein the respective weight ratio of said wax is less than or equal to 200.
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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) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |