Compositions – Electrically conductive or emissive compositions – Elemental carbon containing
Patent
1995-06-30
1996-12-24
Lieberman, Paul
Compositions
Electrically conductive or emissive compositions
Elemental carbon containing
252502, 4234494, 423489, 428922, 428357, 428378, H01B 100, H01B 124
Patent
active
055871100
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a composition containing a carbon fluoride and capable of imparting electric conductivity and non-tackifying property, a paint composition using the above-mentioned composition, and a roller having an electrically resistive layer being formed using the composition.
BACKGROUND ART
Fluorine-containing rubbers have excellent properties such as heat resistance, oil resistance, solvent resistance and chemical resistance as compared with rubbers for general uses, and are widely used as industrial materials in the field where these properties are required.
The fluorine-containing rubbers have been usually used by vulcanizing and molding a vulcanizable fluorine-containing rubber composition, which is prepared by blending a vulcanizing agent, a vulcanization accelerator, an acid receiving agent, a vulcanizing auxiliary, an inorganic filler and the like.
As the above-mentioned mixing components, examples of the vulcanizing agent are a polyamine or its salt, an organic peroxide, a polyhydroxyl compound and the like. As the vulcanization accelerator, examples are an organic tertiary or quaternary compound containing nitrogen or phosphorus and the like, and as the acid receiving agent, examples are a bivalent metal oxide or a hydroxide and the like. As the vulcanizing auxiliary, examples can be mentioned a compound having a plurality of vinyl groups or aryl groups. In addition thereto, there are admixed inorganic fillers, if necessary, such as carbon black, silica, clay, diatom earth, talc, calcium carbonate and the like for the purposes to improve and enhance mechanical properties of mainly the fluorine-containing rubbers.
Further, in order to enhance abrasion resistance of the vulcanized rubber, there are admixed, as a solid lubricant, molybdenum disulfide and graphite or a low molecular weight polytetrafluoroethylene and/or a carbon fluoride as disclosed in JP-B-40168/1981.
Also in order to obtain a high level chemical resistance and elusion resistance which are required in a semiconductor production process and the like, there is a case where a carbon fluoride is admixed as disclosed in JP-A-169845/1987.
These fluorine-containing rubbers are electrically insulative materials having a volume specific resistance exceeding 10.sup.12 .OMEGA.cm. Therefore there was a problem that the molded fluorine-containing rubbers are apt to charge with static electricity thereon, and are susceptible to contamination due to dusts. Thus for the use in the semiconductor production process, it was very difficult to handle those rubbers because of dust generation. Also in a pressure roller, paper feed roller and the like, those rubbers cause troubles that a paper sticks to the roller due to static electricity and toner powders stick or scatter. Also in the use for fuel tubes of automobiles, a spark generated by static electricity becomes a cause for a fire and it is very dangerous.
Therefore it is attempted to admix an electrically conductive material in a fluorine-containing rubber composition. As the electrically conductive material, examples are a carbon material such as carbon black, graphite powder or carbon fiber, and a metal powder.
However if the carbon black is admixed in an amount sufficient for obtaining electric conductivity, there occurs a problem that hardness of the rubber is increased because of a structure of carbon black. The mixing of powder such as graphite powder and carbon fiber having anisotropic shape causes a problem that roughness of the rubber surface is increased, and the admixing of metal powder causes a problem that an excellent chemical resistance inherent to the fluorine-containing rubber is impaired.
Also the desired electric conductivity varies depending on uses. In the above-mentioned various uses, the lower the volume specific resistance is, the more preferable if it is not more than 10.sup.8 .OMEGA.cm. The composition is selected within such a range as not sacrificing other properties of the fluorine-containing rubber composition.
For example, in a
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Isogai Tomohiro
Yamana Masayuki
Daikin Industries Ltd.
Kopec M.
Lieberman Paul
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