US4233352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester film and method of manufacture thereof
Assignee: Toray Industries Inc
•
Filing: 1979-01-09
•
Granted: 1980-11-11
•
Expires: 1999-01-09
Abstract
Abstract A slippery and smooth-surfaced polyester film, at least one surface of which is covered with worm-like nodules, useful as a base film for high recording density magnetic tape.
Inventors
- 👤 Masaaki Ono
- 👤 Kazuo Okabe
- 👤 Yasuki Miura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:49
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/795; G03C1/7954; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; C08J2367/00; C08J2367/02; 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; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31786; Y10T428/31797; Y10T428/31801
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
83 words
A polyester film at least one surface of which is covered with worm-like nodules containing a mixture of an essentially water soluble polymer having a molecular weight of about 10,000-2,000,000 and at least one water emulsifiable polymer selected from the group consisting of (A) polysiloxane having a molecular weight of about 30,000-300,000 and (B) styrene butadiene rubber having a molecular weight of about 20,000-1,000,000, the weight ratio of said water soluble polymer to said water emulsifiable polymer in the mixture being about 1-100:5-50.
Claim 2
Dependent Claim
83 words
A polyester film at least one surface of which is covered with worm-like nodules containing a mixture of an essentially water soluble polymer having a molecular weight of about 10,000-2,000,000 and at least one water emulsifiable polymer selected from the group consisting of (A) polysiloxane having a molecular weight of about 30,000-300,000 and (B) styrene butadiene rubber having a molecular weight of about 20,000-1,000,000, the weight ratio of said water soluble polymer to said water emulsifiable polymer in the mixture being about 1-100:5-50.
Claim 3
Dependent Claim
36 words
The polyester film of claim 1 wherein one surface of said film is covered with said worm-like nodules and both surfaces have an R a value at 0.08 mm cut off of less than about 0.015μ.
Claim 4
Dependent Claim
35 words
The polyester film of claim 1 wherein both surfaces of said film are covered with said worm-like nodules and both surfaces have R a values at 0.08 mm cut off of about 0.005μ to 0.015μ.
Claim 5
Dependent Claim
13 words
The polyester film of claim 1 wherein said polyester is essentially polyethylene terephthalate.
Claim 6
Dependent Claim
11 words
The polyester film of claim 1 further including a natural wax.
Claim 7
Dependent Claim
34 words
The polyester film of claim 5 wherein one surface of said film is covered with worm-like nodules and both surfaces have R a values at 0.08 mm cut off of less than about 0.015μ.
Claim 8
Dependent Claim
34 words
The polyester film of claim 5 wherein both surfaces of said film are covered with worm-like nodules and both surfaces have R a values at 0.08 mm cut off of about 0.005μ to 0.015μ.
Claim 9
Dependent Claim
26 words
The polyester film of claim 5 wherein the weight ratios of the water soluble polymers, the water emulsifiable polymers and the natural wax is about 1-100:5-50:5-100.
Claim 10
Dependent Claim
41 words
The polyester film of claim 5 wherein the water emulsifiable polymer includes both polysiloxane and styrene butadiene rubber, and wherein the weight ratios of the water soluble polymer, the polysiloxane, the styrene butadiene rubber, and the natural wax is about 1-100:2-25:2:25:5:100.
Claim 11
Dependent Claim
12 words
The polyester film of claim 5 wherein said polyester is polyethylene terephthalate.
Claim 12
Dependent Claim
35 words
The polyester film of claim 5 wherein said polyester is stretch oriented in the machine direction and in the transverse direction, and wherein said worm-like nodules are elongated and extend in substantially the machine direction.
Claim 13
Dependent Claim
19 words
The polyester film of claim 11 wherein said nodules are broken apart from one another in the machine direction.
Claim 14
Dependent Claim
16 words
The polyester film defined in claim 11 wherein the lengths of said nodules are about 0.1-50μ.
Claim 15
Dependent Claim
16 words
The polyester film defined in claim 11 wherein the lengths of said nodules are about 0.5-15μ.
Claim 16
Dependent Claim
16 words
The polyester film defined in claim 11 wherein the widths of said nodules are about 0.1-10μ.
Claim 17
Dependent Claim
16 words
The polyester film defined in claim 11 wherein the widths of said nodules are about 0.1-3.0μ.
Claim 18
Dependent Claim
16 words
The polyester film defined in claim 11 wherein the heights of said nodules are about 0.005-0.3μ.
Claim 19
Dependent Claim
16 words
The polyester film defined in claim 11 wherein the heights of said nodules are about 0.01-0.1μ.
Claim 20
Dependent Claim
31 words
The polyester film defined in claim 11 wherein the population density of said worm-like nodules on the surface of the film is about 10 5 -10 9 nodules per square centimeter.
Claim 21
Dependent Claim
31 words
The polyester film defined in claim 11 wherein the population density of said worm-like nodules on the surface of the film is about 10 6 -10 8 nodules per square centimeter.
Claim 22
Dependent Claim
44 words
The polyester film defined in claim 11 wherein the ASTM D-1894-63 coefficients of friction as between two slippery surfaces of the film is μ s =about 0.15-0.56 and μ k =about 0.10-0.49, where μ s represents static coefficient and μ k represents kinetic coefficient.
Claim 23
Dependent Claim
48 words
The polyester film defined in claim 11 wherein the ASTM D-1894-63 coefficients of friction as between one nodule-covered film surface and a conventional polyester film surface is μ s =about 0.20-0.87 and μ k =about 0.10-0.80, where μ s represents static coefficient and μ k represents kinetic coefficient.
Claim 24
Dependent Claim
46 words
The polyester film defined in claim 11 wherein said polysiloxane has the structure ##STR2## wherein R 1 is CH 3 , C 6 H 5 or H and wherein R 2 is CH 3 , C 6 H 5 , H or a cross-linkable functional group.
Claim 25
Dependent Claim
35 words
The polyester film of claim 1 wherein said polyester is stretch oriented in the machine direction and in the transverse direction, and wherein said worm-like nodules are elongated and extend in substantially the machine direction.
Claim 26
Dependent Claim
19 words
The polyester film of claim 24 wherein said nodules are broken apart from one another in the machine direction.
Claim 27
Dependent Claim
16 words
The polyester film defined in claim 24 wherein the lengths of said nodules are about 0.1-50μ.
Claim 28
Dependent Claim
16 words
The polyester film defined in claim 24 wherein the lengths of said nodules are about 0.5-15μ.
Claim 29
Dependent Claim
16 words
The polyester film defined in claim 24 wherein the widths of said nodules are about 0.1-10μ.
Claim 30
Dependent Claim
16 words
The polyester film defined in claim 24 wherein the widths of said nodules are about 0.1-3.0μ.
Claim 31
Dependent Claim
16 words
The polyester film defined in claim 24 wherein the heights of said nodules are about 0.005-0.3μ.
Claim 32
Dependent Claim
16 words
The polyester film defined in claim 24 wherein the heights of said nodules are about 0.01-0.1μ.
Claim 33
Dependent Claim
31 words
The polyester film defined in claim 24 wherein the population density of said worm-like nodules on the surface of the film is about 10 5 -10 9 nodules per square centimeter.
Claim 34
Dependent Claim
31 words
The polyester film defined in claim 24 wherein the population density of said worm-like nodules on the surface of the film is about 10 6 -10 8 nodules per square centimeter.
Claim 35
Dependent Claim
44 words
The polyester film defined in claim 24 wherein the ASTM D-1894-63 coefficients of friction as between two slippery surfaces of the film is μ s =about 0.15-0.56 and μ k =about 0.10-0.49, where μ s represents static coefficient and μ k represents kinetic coefficient.
Claim 36
Dependent Claim
48 words
The polyester film defined in claim 24 wherein the ASTM D-1894-63 coefficients of friction as between one nodule-covered film surface and a conventional polyester film surface is μ s =about 0.20-0.87 and μ k =about 0.10-0.80, where μ s represents static coefficient and μ k represents kinetic coefficient.
Claim 37
Dependent Claim
46 words
The polyester film defined in claim 24 wherein said polysiloxane has the structure ##STR3## wherein R 1 is CH 3 , C 6 H 5 or H and wherein R 2 is CH 3 , C 6 H 5 , H or a cross-linkable functional group.
Claim 38
Independent Claim
111 words
A method of manufacturing a coated polyester film which comprises: (a) coating at least one surface of a unidirectionally oriented polyester film with a water emulsion containing a water soluble polymer having a molecular weight of about 10,000-2,000,000 and a water emulsifiable polymer selected from the group consisting of (A) polysiloxane having a molecular weight of about 30,000-300,000 and (B) a styrene butadiene rubber having a molecular weight of about 20,000-1,000,000, and water; (b) drying the coated film; (c) transversely stretching the dried film; and (d) heat setting the transversely stretched film, the weight ratio of said water soluble polymer to said water emulsifiable polymer in the mixture being about 1-100:5-50.
Claim 39
Independent Claim
111 words
A method of manufacturing a coated polyester film which comprises: (a) coating at least one surface of a unidirectionally oriented polyester film with a water emulsion containing a water soluble polymer having a molecular weight of about 10,000-2,000,000 and a water emulsifiable polymer selected from the group consisting of (A) polysiloxane having a molecular weight of about 30,000-300,000 and (B) a styrene butadiene rubber having a molecular weight of about 20,000-1,000,000, and water; (b) drying the coated film; (c) transversely stretching the dried film; and (d) heat setting the transversely stretched film, the weight ratio of said water soluble polymer to said water emulsifiable polymer in the mixture being about 1-100:5-50.
Claim 40
Dependent Claim
13 words
The method of claim 37 wherein said water emulsion further contains natural wax.
Claim 41
Dependent Claim
19 words
The method of claim 37 wherein the step of machine direction stretching is interposed between steps (c) and (d).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |