Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-09-21
2000-12-05
Yoon, Tae
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524544, 524795, 523149, 427127, 4273855, 528498, C08K 502, C08L 2712, B05D 508
Patent
active
061568244
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a liquid containing a lubricating polymer uniformly dissolved or dispersed in the liquid, and a process forming a lubricative film having excellent lubricative property on a surface of a solid from the lubricating polymer-containing liquid.
BACKGROUND ART
To impart lubricative property, water repellency and the like on a surface of a solid, a process for forming a film having good lubricative property on the solid surface from a liquid having a lubricating polymer dissolved or dispersed therein is adopted.
For miniaturization and precision-enhancement of electronic instruments, mechanical devices and parts, it is required that sliding parts or surfaces thereof have a good lubricative property. Especially, for improving sliding property between a hard disk, a miniature disk, a magnetic tape such as a digital audio tape or a video tape, or other magnetic recording mediums, and a head for recording and reading, lubrication with high precision, durability and reliability is required. Thus, to secure, for example, durability and practical reliability of a hard disk, a protective layer such as a carbon layer and additionally a lubricative layer of fluoropolymer are formed on a hard disk. For improvement of performances and miniaturization of cameras, video cameras, business and office machines, medical instruments, vacuuming devices such as a vacuum pump, electronic parts, precision automobile parts, small size motors, ultrasonic motors and micro-machines, formation of a lubricative layer made of a fluoropolymer on sliding parts is widely adopted to attain lubrication with enhanced durability, high reliability and reduced staining property. For an ink-jet recording head, a water repellent film is formed on a surface of the nozzle to secure extrusion stability and directional property of a polar liquid flowing through the nozzle hole.
Many proposals have been made as for the process for forming a lubricative film or a water repellent film on a surface of a solid. For example, a process has been proposed wherein a polymer having an extremely low surface tension such as a fluoropolymer is dissolved in a suitable volatile solvent, various materials and parts are coated with the thus-obtained solution, and then, the solvent is vaporized to form a polymer film.
Another proposal using a solution of a fluoropolymer in a fluorine-containing solvent is known. As for the fluorine-containing solvent, there can be mentioned, for example, freon 113 (Japanese Unexamined Patent Publication (abbreviated to "JP-A") H5-342570) and perfluoro-n-heptane (JP-A H4-211959). However, freon 113 is now not on the market although it has been heretofore used, because of prohibition of production of ozone-depleting substances. Perfluorocarbons such as perfluoro-n-heptane have a poor dissolving power for various materials and cannot be used for the formation of a uniform fluoropolymer film.
A process for forming a film from a polymer dispersion is described in JP-A H3-158884 wherein finely divided particles of polyvinylidene fluoride, phenolic resin or Tosu-pearl are dispersed in a liquid medium selected from isopropyl alcohol, ethyl alcohol, freon 113 and water, and the thus-prepared dispersion is coated on an image-carrier and a contact surface of a member placed in contact with the carrier in an image-forming device, followed by drying the coating. It is described in JP-A H3-158884 that frictional force between the image-carrier and the contact member such as a cleaning blade is mitigated by formation of the polymer film whereby problems such as surface peeling of the blade and non-uniform static electrification on the surface of the image-carrier are solved.
Another process for forming a film from a resin dispersion is described in JP-A H3-197952 wherein a dispersion of a finely divided lubricative powder such as finely divided fluoro-resin powder or a finely divided silicone resin powder in an organic solvent is sprayed onto a surface of an electrophotographic photoreceptor, followed by drying
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patent: 5462586 (1995-10-01), Sugiyama et al.
patent: 5510406 (1996-04-01), Matsuo et al.
patent: 5608002 (1997-03-01), Kubo et al.
Goto Kuniaki
Ohtsuki Noriyasu
Yamada Toshiro
Nippon Zeon Co. Ltd.
Yoon Tae
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