EP0100670A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Conductive film for packaging
Assignee: Kureha Corp
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Filing: 1983-07-29
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Granted: —
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Expires: 2003-07-29
Abstract
Abstract @ A conductive film comprises a transparent matrix of a thermoplastic resin having short conductive fibers in contact with one another dispersed therein such that the film has an opacity of not more than 30% and a surface resistivity of not more than 1×10 8 Ω cm. The conductive film is produced by mixing a thermoplastic synthetic pulp slurry with the short conductive fibers, forming a raw paper sheet from the resultant mixture by means of paper-making apparatus and heating the raw paper sheet under pressure at a temperature higher than the melting point of the thermoplastic synthetic pulp. The film is useful for packaging electronic components.
Inventors
- 👤 Itsupei Katou
- 👤 Tomihisa Kouno
- 👤 Harunobu Egawa
- 👤 Toshitaka Kouyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 21:50
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C; C08; C08J; C08J5/00; C08J5/04; C08K; C08K7/00; C08K7/02; C08K7/04; D; D21; D21H; D21H11/00; D21H11/02; D21H11/04; D21H13/00; D21H13/10; D21H13/12; D21H13/14; D21H5/00; D21H5/12; H01B1/22
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
45 words
A conductive film comprising a transparent matrix of a thermoplastic resin having short conductive fibers in contact with one another dispersed therein such that the film has an opacity of 30% or less and a surface resistivity of 1 x 10 8 a.cm or less.
Claim 2
Dependent Claim
45 words
A conductive film comprising a transparent matrix of a thermoplastic resin having short conductive fibers in contact with one another dispersed therein such that the film has an opacity of 30% or less and a surface resistivity of 1 x 10 8 a.cm or less.
Claim 3
Dependent Claim
14 words
A conductive film according claim 1 wherein the short conductive fibers are carbon fibers.
Claim 4
Dependent Claim
29 words
A conductive film according to claim 2 wherein the carbon fibers have a length of from 1 to 25 mm and a diameter of from 5 to 30 µm.
Claim 5
Dependent Claim
24 words
A conductive film according to claim 2 or 3 wherein the carbon fiber is present in an amount of 0.5 to 20% by volume.
Claim 6
Dependent Claim
42 words
A conductive film according to claim 1 wherein the short conductive fibers are metal or metal-coated fibers selected from stainless steel fibers, aluminum fibers, brass fibers, carbon fibers coated with aluminum or nickel, and glass fibers coated with aluminum or nickel. -
Claim 7
Dependent Claim
30 words
A conductive film according to claim 5 wherein the metal or metal-coated fibers have a length of from 1 to 25 mm a diameter of from 1 to 100 µm.
Claim 8
Dependent Claim
30 words
A conductive film according to claim 6 wherein the metal or metal-coated fibers have a length of from 3 to 15 mm and a diameter of 20 µm or less.
Claim 9
Dependent Claim
29 words
A conductive film according to any one of claims 5 to 7 wherein the metal or metal-coated fiber is present in an amount of 0.5 to 30% by volume.
Claim 10
Dependent Claim
28 words
A conductive film according to any one of the preceding claims wherein upto less than 50% of the volume of the thermoplastic resin is replaced by chemical pulp.
Claim 11
Dependent Claim
25 words
A conductive film according to claim 9 wherein up to less than 30% of the volume of the thermoplastic resin is replaced by chemical pulp.
Claim 12
Dependent Claim
24 words
A conductive film according to claim 9 or 10 wherein the carbon fibers are present in an amount of less than 6% by volume.
Claim 13
Dependent Claim
26 words
A conductive film according to claim 9 or 10 wherein the metal or metal-coated fibers are present in an amount of less than 19% by volume.
Claim 14
Dependent Claim
24 words
A conductive film according to any one of the preceding claims which has a surface resistivity of 1 x 10 6 Ω·cm or less.
Claim 15
Dependent Claim
21 words
A conductive film according to any one of the preceding claims wherein cellulose fibers are further dispersed in the transparent matrix.
Claim 16
Dependent Claim
21 words
A conductive film according to any one of the preceding claims which has a thickness of not more than 100 µm.
Claim 17
Dependent Claim
67 words
A process of the preparation of a conductive film as claimed in any one of the preceding claims, which process comprises mixing a thermoplastic synthetic pulp slurry with the short conductive fibers forming a raw paper sheet from the resultant mixture by means of paper-making apparatus and heating the raw paper sheet under pressure at a temperature higher than the melting point of the thermoplastic synthetic pulp.
Claim 18
Dependent Claim
25 words
A process according to claim 16 wherein up to less than 50% of the volume of the thermoplastic synthetic pulp is replaced by chemical pulp.
Claim 19
Dependent Claim
25 words
A process according to claim 17 wherein up to less than 30% of the volume of the thermoplastic synthetic pulp is replaced by chemical pulp.
References Cited (Backward Citations)
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