EP0661094A2
Expired / Lapsed
EP
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Adsorption material comprising activated carbon fiber and polytetrafluoroethylene
Assignee: Teijin Ltd
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Filing: 1994-06-13
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Granted: —
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Expires: 2014-06-13
Abstract
Abstract An adsorption material and process for producing the same is disclosed, comprising milled activated carbon fiber and together by fibrils of a polytetrafluoroethylene resin. The adsorption material has high tensile strength and elongation and good softness. Furthermore, the adsorption material has high adsorptivity, high packing density and good gas permeability.
Inventors
- 👤 Naoki C/O Toho Rayon Co. Ltd. Sakai
- 👤 Tetsuro C/O Toho Rayon Co. Ltd. Shigei
- 👤 Takayuki C/O Toho Rayon Co. Ltd. Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 15:33
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28026; B01J20/28002; B01J20/28004; B01J20/28011; B01J20/28023; B01J20/28033; B01J20/28054; B01J20/28057
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
16 words
An adsorption material comprising milled activated carbon fiber bound together by fibrils of a polytetrafluoroethylene resin.
Claim 2
Dependent Claim
23 words
The adsorption material as in claim 1, wherein the average fiber diameter of the activated carbon fiber is from 2 to 50 µm.
Claim 3
Dependent Claim
69 words
The adsorption material as in claims 1 or 2 wherein the content of activated carbon fiber having a ratio of the length of the activated carbon fiber measured by a laser light scattering technique to the average diameter of the activated carbon fiber of not less than 3 is at least 20 wt% based on the total amount of activated carbon fiber of ACF contained in the adsorption material.
Claim 4
Dependent Claim
37 words
The adsorption material as in claims 1, 2 or 3 wherein the amount of the polytetrafluoroethylene resin contained in the adsorption material is from 0.5 to 50 wt% based on the total weight of the adsorption material.
Claim 5
Dependent Claim
37 words
The adsorption material as in any of claims 1 to 4 wherein the adsorption material further comprises carbon powder having an average size that is not greater than the average fiber diameter of the activated carbon fiber.
Claim 6
Dependent Claim
41 words
The adsorption material as in any of the preceding claims wherein the adsorption material further comprises carbon powder in an amount of from 5 to 50 wt% based on the total weight of the activated carbon fiber and the carbon powder.
Claim 7
Dependent Claim
21 words
The adsorption material as in any of the preceding claims wherein the adsorption material is in a form of a sheet.
Claim 8
Dependent Claim
37 words
The adsorption material as in claim 7 , wherein the adsorption material is in a form of a sheet having a tensile strength of at least 5 g/mm² and a tensile elongation of at least 10 %.
Claim 9
Dependent Claim
24 words
The adsorption material as in any of the preceding claims wherein the adsorption material has a packing density of from 0.3 to 1.0 g/cm³.
Claim 10
Dependent Claim
30 words
The adsorption material as in any of the preceding claims wherein the activated carbon fiber in the adsorption material has a specific surface area of not less than 400 m²/g.
Claim 11
Dependent Claim
34 words
The adsorption material as in any of claims 7 to 10 wherein the adsorption material is in a form of a sheet and the activated carbon fiber contained in the sheet is randomly oriented.
Claim 12
Dependent Claim
34 words
The adsorption material as in any of claims 7 to 10 wherein the adsorption material is in a form of a sheet and the activated carbon fiber is mainly oriented in a single direction.
Claim 13
Independent Claim
33 words
A method for production of an adsorption material, which comprises mixing milled activated carbon fiber and a polytetrafluoroethylene resin, and then applying compressive shear stress to the mixture to fibrillate the polytetrafluoroethylene resin.
Claim 14
Dependent Claim
29 words
The method for production of an adsorption material, according to claim 13 wherein compressive shear stress is applied to the mixture containing not more than 40 wt% of liquid.
Claim 15
Independent Claim
34 words
The method for production of an adsorption material as in claims 13 or 14 wherein compressive shear stress is applied until a tensile strength of the adsorption material increases to at least 5 g/mm².
Claim 16
Independent Claim
35 words
The method for production of an adsorption material as in claims 13,14 or 15 wherein compressive shear stress is applied using a roll mill comprising at least two rolls which rotate at different linear speeds.
Claim 17
Dependent Claim
59 words
The method for production of an adsorption material as in claim 16, wherein compressive shear stress is applied using a roll mill comprising at least two rolls which rotate at different linear speeds, and the adsorption material is then formed into a sheet using a press roll comprising at least two rollers which rotate at the same linear speed.
Claim 18
Dependent Claim
56 words
The method for production of an adsorption material as in claim 17, wherein said applying step comprises passing the mixture through at least one of the roll mill and the press roll at least in two directions crossing at right angles to one other to form a sheet where the activated carbon fiber is randomly oriented.
Claim 19
Dependent Claim
41 words
The method for production of an adsorption material as in claim 17, wherein said applying step comprises repeatedly press rolling the sheet in the same direction so that activated carbon fiber contained in the sheet is mainly oriented in one direction.
Claim 20
Independent Claim
41 words
The method for production of an adsorption material as in any of claims 13 to 19, wherein the mixture further comprises carbon powder having an average size that is not greater than the average fiber diameter of the activated carbon fiber.
Claim 21
Independent Claim
47 words
The method for production of an adsorption material as in any of claims 13 to 20 wherein the adsorption material further comprises carbon powder in an amount of from 5 to 50 wt% based on the total weight of the activated carbon fiber and the carbon powder.
Claim 22
Independent Claim
35 words
The method for production of an adsorption material as in claims 17,18 or 19 wherein the nip size of the roll mill is from 5 to 40 times the average diameter of activated carbon fiber.
Claim 23
Dependent Claim
21 words
The adsorption material as in any of claims 1 to 12 wherein the adsorption material is covered with a membrane filter.
Claim 24
Dependent Claim
25 words
The adsorption material as in any of claims 1 to 12 wherein a sheet obtained from said adsroption material is covered with a membrane filter.
Claim 25
Dependent Claim
27 words
The use of an adsorption material as defined in any of claims 1 to 12 for the protection of electronic or electrical devices, or equipment, from pollutants.
References Cited (Backward Citations)
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