Patent US4749616A successfully refreshed from Google Patents.
EP0152265A2
Expired / Lapsed
EP
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Oriented polyester film and its use
Assignee: Nippon Magphane KK
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Filing: 1985-02-05
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Granted: —
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Expires: 2005-02-05
Abstract
Abstract An oriented polyester film comprising a polyester derived from ethylene terephthalate as the major monomeric unit; from 0.01 to 1.0% by weight of silica and/or titanium dioxide particles having an average size of 0.01 to 0.5 µm; and from 0.005 to 1.0% by weight of calcium carbonate particles having an average particle size of 0.01 to 0.5 µm. It can be used as the base film for a video tape.
Inventors
- 👤 Katsuaki Kuze
- 👤 Yasuhiro Nishino
- 👤 Yujiro Matsuyama
- 👤 Kozo Maeda
- 👤 Masahiro Kobayasi
- 👤 Tadashi Okudaira
- 👤 Tsuyoshi Hongo
- 👤 Osamu Makimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 06:38
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/26; C08J; C08J5/00; C08J5/18; C08K3/20; C08K3/22; C08K3/34; C08K3/36; G; 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; Y10S428/91; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/258; Y10T428/259; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
58 words
An oriented polyester film comprising a polyester derived from ethylene terephthalate as the major monomeric unit; from 0.01 to 1.0% by weight of silica and/or titanium dioxide particles having an average size of 0.01 to 0.5 µm; and from 0.005 to 1.0% by weight of calcium carbonate particles having an average particle size of 0.01 to 0.5 µm.
Claim 2
Dependent Claim
58 words
An oriented polyester film comprising a polyester derived from ethylene terephthalate as the major monomeric unit; from 0.01 to 1.0% by weight of silica and/or titanium dioxide particles having an average size of 0.01 to 0.5 µm; and from 0.005 to 1.0% by weight of calcium carbonate particles having an average particle size of 0.01 to 0.5 µm.
Claim 3
Dependent Claim
36 words
A film according to claim 1, wherein the silica and/or titanium dioxide particles have an average particle size of 0.01 to 0.4 µm, more preferably 0.01 to 0.3 µm, and most preferably 0.03 to 0.1 µm.
Claim 4
Dependent Claim
38 words
A film according to claim 1 or claim 2, which comprises 0.02 to 0.6% by weight, more preferably 0.05 to 0.5% by weight, and most preferably 0.05 to 0.3% by weight of the silica and/or titanium dioxide particles.
Claim 5
Dependent Claim
40 words
A film according to any preceding claim, wherein the calcium carbonate particle have an average particle size of 0.03 to 0.49 µm, preferably 0.04 to 0.48 µm, more preferably 0.04 to 0.1 µm, and most preferably 0.1 to 0.48 µm.
Claim 6
Dependent Claim
34 words
A film according to any preceding claim, which comprises 0.01 to 0.6% by weight, more preferably 0.02 to 0.5% by weight, and most preferably 0.02 to 0.2% by weight of the calcium carbonate particles.
Claim 7
Dependent Claim
28 words
A film according to any preceding claim, wherein the average particle size of the calcium carbonate particles is larger than that of the silica and/or titanium dioxide particles.
Claim 8
Dependent Claim
10 words
A film according to any preceding claim, which is biaxially-oriented.
Claim 9
Dependent Claim
19 words
A video tape which comprises, as the base film thereof, an oriented polyester film according to any preceding claim.
References Cited (Backward Citations)
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