Patent US106022A successfully refreshed from Google Patents.
EP0053498A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Polyester laminated film
Assignee: Toray Industries Inc
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Filing: 1981-11-27
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Granted: —
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Expires: 2001-11-27
Abstract
Abstract The present invention provides a polyester laminated film which comprises a transparent layer (1) and a delustered layer (2) laminated at least on one side face of the transparent layer. The transparent layer is formed by a biaxially stretched polyester film mainly composed of polyethylene terephthalate, while the delustered layer is made of an at least uniaxially stretched polyester film which is mainly composed of a polyethylene terephthalate copolymer containing, as a copolymer composition, 1 to 20 mol.% of the delustered layer of or (wherein n is an integer from 2 to 140, and X represents or and which also contains inert inorganic particles (2') of 0.3 to 20 microns diameter in an amount 3 to 40% by weight of the delustered layer. Film according to the present invention as described above is roughened on the surface, and has excellent writability and transcribability by pencils, ink, indian ink, etc., combined with an excellent transparency, and therefore, is very useful for use as tracing films and the like.
Inventors
- 👤 Satoyuki Minami
- 👤 Ryuichi Nagata
- 👤 Toshihiro Otaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 02:26
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/36; B32B27/06; B32B27/08; B32B27/18; B32B7/00; B32B7/04; B32B7/12; H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R7/122; B32B2264/00; B32B2264/10; B32B2264/102; B32B2264/104; B32B2307/00; B32B2307/20; B32B2307/21; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/514; B32B2307/516; B32B2307/518; B32B2367/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/25; Y10T428/258; Y10T428/259; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/266; Y10T428/269; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
107 words
A polyester laminated film which comprises a transparent layer and a delustered layer laminated at least on one side face of said transparent layer, said transparent layer comprising a biaxially stretched polyester film mainly composed of polyethylene terephthalate, said delustered layer comprising an at least uniaxially stretched polyester film which is mainly composed of a polyethylene terephthalate copolymer containing, as a copolymer composition, 1 to 20 mol. % or (wherein n is an integer from 2 to 140, and X represents and which also contains inert inorganic particles of 0.3 to 20 microns average diameter in an amount 3 to 40% by weight of said delustered layer.
Claim 2
Dependent Claim
107 words
A polyester laminated film which comprises a transparent layer and a delustered layer laminated at least on one side face of said transparent layer, said transparent layer comprising a biaxially stretched polyester film mainly composed of polyethylene terephthalate, said delustered layer comprising an at least uniaxially stretched polyester film which is mainly composed of a polyethylene terephthalate copolymer containing, as a copolymer composition, 1 to 20 mol. % or (wherein n is an integer from 2 to 140, and X represents and which also contains inert inorganic particles of 0.3 to 20 microns average diameter in an amount 3 to 40% by weight of said delustered layer.
Claim 3
Dependent Claim
26 words
A polyester laminated film according to Claim 1, wherein said inert inorganic particles have an average particle diameter in the range of 3 to 15 microns.
Claim 4
Dependent Claim
37 words
A polyester laminated film according to Claim 1 or Claim 2 wherein the amount of said inert inorganic particles in the delustered layer is in the range of 4 to 20% by weight of said delustered layer.
Claim 5
Dependent Claim
28 words
A polyester laminated film according to any one of the preceding claims wherein said delustered layer is laminated onto each of the opposite faces of said transparent layer.
Claim 6
Dependent Claim
22 words
A polyester laminated film according to any one of the preceding claims, wherein said delustered layer is of a biaxially stretched film.
Claim 7
Dependent Claim
33 words
A polyester laminated film according to any one of the preceding claims, wherein the amount of the copolymer composition in the delustered layer is in the range of 1.5 to 10 mol. %.
Claim 8
Dependent Claim
35 words
A polyester laminated film according to any one of the preceding claims, wherein the polyester constituting said transparent layer is a polyester which contains ethylene terephthalate units in an amount at least 98 mol. %.
Claim 9
Dependent Claim
31 words
A polyester laminated film according to claim 7, wherein the polyester constituting said transparent layer is a polyester which contains ethylene terephthalate units in an amount at least 99 mol. %.
Claim 10
Dependent Claim
20 words
A polyester laminated film according to claim 8, wherein the polyester constituting said transparent layer is an ethylene terephthalate homopolymer.
Claim 11
Dependent Claim
26 words
A polyester laminated film according to any one of the preceding claims, wherein the polyester constituting said transparent layer has an intrinsic viscosity higher than 0.45.
Claim 12
Dependent Claim
22 words
A polyester laminated film according to claim 10 wherein the polyester constituting said transparent layer has an intrinsic viscosity higher than 0.60.
Claim 13
Dependent Claim
30 words
A polyester laminated film according to any one of the preceding claims wherein the polyester film for the delustered layer has an absolute value |Δn| of birefringence larger than 0.004.
Claim 14
Dependent Claim
30 words
A polyester laminated film according to claim 12 wherein the polyester film for the transparent layer has an absolute value |Δn| of birefringence in the range of 0.004 to 0.2.
Claim 15
Dependent Claim
47 words
A polyester laminated film according to any one of the preceding claims wherein said inert inorganic particles are of at least one kind of substance selected from the group of oxides of inorganic compounds and salts of inorganic compounds, which are inactive with respect to the polyester.
Claim 16
Dependent Claim
46 words
A polyester laminated film according to claim 14, wherein said inert inorganic particles are of at least one kind selected from the group consisting of silica, kaolin, - talc, silica alumina, zinc oxide, zinc sulphide, barium oxide, barium sulphate, zirconium oxide, titanium oxide, and calcium carbonate.
Claim 17
Dependent Claim
17 words
A polyester laminated film according to claim 15, wherein said inactive particles are of Si0 2 .
Claim 18
Dependent Claim
25 words
A polyester laminated film according to any one of the preceding claims, wherein said delustered layer comprises a polyester film containing an anion anti-static agent.
Claim 19
Dependent Claim
26 words
A polyester laminated film according to claim 17, wherein the content of said anion anti-static agent is in the range of 0.1 to 10% by weight.
Claim 20
Dependent Claim
21 words
A polyester laminated film according to claim 17 or claim 18, wherein said anion anti-static agent is of sodium dodecyl-benzene sulphonate.
Claim 21
Dependent Claim
29 words
A polyester laminated film according to any one of the preceding claims wherein the copolymer composition for the ' delustered layer comprises an ethylene oxide adduct of bisphenol A.
Claim 22
Dependent Claim
33 words
A polyester laminated film according to any one of claims 1 to 19, wherein the copolymer composition for the delustered layer comprises a polyethylene glycol with a molecular weight of less than 6000.
Claim 23
Dependent Claim
25 words
A polyester laminated film according to any one of claims 1 to 19, wherein the copolymer composition for the delustered layer comprises a triethylene glycol.
Claim 24
Dependent Claim
26 words
A polyester laminated film according to any one of the preceding claims wherein said delustered layer has thickness in the range of 1 to 20 microns.
Claim 25
Dependent Claim
22 words
A polyester laminated film according to claim 23 wherein said delustered layer has thickness in the range of 3 to 10 microns.
Claim 26
Dependent Claim
26 words
A polyester laminated film according to any one of the preceding claims wherein said transparent layer has thickness in the range of 10 to 200 microns.
Claim 27
Dependent Claim
22 words
A polyester laminated film according to claim 25, wherein said transparent layer has thickness in the range of 15 to 150 microns.
Claim 28
Dependent Claim
32 words
A polyester laminated film according to any one of the preceding claims, wherein the stretching ratio thereof in the longitudinal or lateral direction is in the range of 2.5 to 6 times.
Claim 29
Dependent Claim
28 words
A polyester laminated film according to claim 27 wherein the stretching ratio thereof in the longitudinal or lateral direction is in the range of 2.5 to 4 times.
References Cited (Backward Citations)
No citation records indexed.
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