EP0307475A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Film for thermal porous printing paper
Assignee: Toray Industries Inc
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Filing: 1987-09-02
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Granted: —
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Expires: 2007-09-02
Abstract
Abstract A film for heat-sensitive mimeograph stencil and a heat-sensitive mimeograph stencil comprising a porous support and the film laminated thereon are disclosed. Since the film of the present invention has an energy of crystal fusion A Hu of 3 - 11 cal/g and has a difference Tm in temperature of the crystal fusion-starting point and the crystal fusion-terminating point of 50°C to 100°C, the heat sensitivity is high, so that the characters and symbols or figures can be printed clearly, and the unevenness in the thickness and the light and shade of the printed characters may substantially be eliminated. Further, since it is not necessary to make the film thin, productivity and ease of handling may be promoted.
Inventors
- 👤 Seizo Aoki
- 👤 Kenji Tsunashima
- 👤 Toshiya Yoshii
- 👤 Yasuji Nakahara
- 👤 Takashi Sumiya
- 👤 Takashi Mimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 15:23
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/24; B41N1/245; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/31; Y10T428/31504; Y10T428/31551; Y10T428/31786
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
46 words
A film for heat-sensitive mimeograph stencil made of a polyester-based biaxially stretched film which has an energy of crystal fusion Δ Hu of 3 - 11 cal/g and has a difference Tm between the crystal fusion-terminating temperature and the crystal fusion-starting temperature of 50°C to 100°C.
Claim 2
Dependent Claim
46 words
A film for heat-sensitive mimeograph stencil made of a polyester-based biaxially stretched film which has an energy of crystal fusion Δ Hu of 3 - 11 cal/g and has a difference Tm between the crystal fusion-terminating temperature and the crystal fusion-starting temperature of 50°C to 100°C.
Claim 3
Dependent Claim
63 words
The film of claim 1, wherein the surface of the film has a center line average roughness Ra of 0.05 - 0.3 µm, maximum roughness Rt of 0.5 - 4. 0 µm, 2,000 - 10,0 00/ mm 2 of projections with a diameter of 1 pm or more and 20 - 1,000/mm 2 of projection with a diameter of 8 - 20 µm.
Claim 4
Dependent Claim
45 words
The film of claim 2, further comprising at least one kind of particles made of the material selected from the group consisting of oxides and inorganic salts of an element belonging to IIA group, IIIB group, IVA group and IVB group in the periodic table.
Claim 5
Dependent Claim
17 words
The film of claim 3, wherein the content of the particles is 0.05 - 2% by weight.
Claim 6
Dependent Claim
31 words
The film of claim 1, further comprising at least one higher aliphatic substance of which major component is C 10 - C 33 higher aliphatic monocarboxylic acid or an ester thereof.
Claim 7
Dependent Claim
29 words
The film of claim 5, wherein the content of the higher aliphatic substance is 0.005 - 5% by weight based on the weight of the polyester constituting the film.
Claim 8
Dependent Claim
18 words
The film of claim 1, wherein the energy of crystal fusion Δ Hu is 5 - 10 cal/g.
Claim 9
Dependent Claim
19 words
A heat-sensitive mimeograph stencil comprising a porous support and the film of claim 1 laminated on the porous support.
Claim 10
Dependent Claim
28 words
The stencil of claim 8, further comprising a non hot-sticking layer on the surface of the film which surface is other than the surface contacting the porous support.
Claim 11
Dependent Claim
63 words
The stencil of claim 9, wherein the non hot-sticking layer comprises as a major component at least one materials selected from the group consisting of thermosetting silicone resins, thermoplastic silicone resins, epoxy resins, melamine resins, phenol resins, thermosetting acrylic resins, polyimide resins, metal salts of aliphatic acids, phosphoric acid esters, supercooling substance, fluorine resins, perfluoroacrylic resins, vinyl chloride resins and vinilidene chloride resins.
Claim 12
Dependent Claim
33 words
The stencil of claim 9, wherein the non hot-sticking layer consists essentially of a mixture of polyester copolymer (A) and organopolysiloxane (B), the weight ratio (B/A) of the mixture being 0.01 to 8.
Claim 13
Dependent Claim
44 words
The stencil of claim 12, wherein the non hot-sticking layer comprises at least 10% by weight of cured material consisting essentially of an urethane prepolymer having a principal chain of an organopolysiloxane and containing a free isocyanate group as terminal group and/or pendant group.
Claim 14
Dependent Claim
57 words
The stencil of claim 13, wherein the non hot-sticking layer comprises cured material consisting essentially of a mixture of an urethane prepolymer (A) having a principal chain of an organopolysiloxane and containing a free isocyanate group as terminal group and/or pendant group, and active hydrogen-containing polymer (B) with the weight ratio of (A)/(B) of 10/90 to 90/10.
References Cited (Backward Citations)
No citation records indexed.
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