Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Physical dimension specified
Patent
1998-02-27
2000-08-15
Thibodeau, Paul
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Physical dimension specified
428483, 428692, 428694SL, 525204, 526287, 526288, 5262929, 526304, B32B 2708, B32B 2730, B32B 2736, C08L 3904, C08F 2058
Patent
active
061033685
DESCRIPTION:
BRIEF SUMMARY
DETAILED DESCRIPTION OF THE INVENTION
1. Technical Field
This invention relates to an antistatic polyester film, more particularly to an antistatic polyester film having excellent antistaticity, back-transfer resistance, chipping resistance, blocking resistance and reclaimability and suitable for magnetic cards (for example telephone card or prepaid card), electronic materials, graphic materials, graphic arts films, OHP films, magnetic recording materials (for example magnetic tapes such as audio tape or video tape or magnetic disks such as floppy disk), etc., especially for magnetic cards.
2. Background Art
Polyester films made of a polyester such as polyethylene terephthalate or polyethylene 2,6-naphthalate are widely in use as a film for magnetic card, general industrial materials such as a packaging material, a photographic material or a graphic material and magnetic recording materials such as a magnetic recording tape. However, these polyesters have defects of high surface resistivity to readily accumulate static charge by friction, etc. Accumulation of static charge on a polyester film induces the deposition of dust on the film surface and causes the problem of product deficiency. Further, a spark discharge may occur during the production or the processing of the film to arise the problem of ignition hazard when an organic solvent is used in the above procedures.
Various methods for forming an antistatic layer on the film surface have been proposed and put into practical use as a means for preventing the problems caused by the static charge accumulation of these films. The formation of an antistatic layer on a film surface is usually performed by coating the film surface with a coating liquid containing an antistatic agent.
Low-molecular weight compounds and high-polymer compounds are known as the antistatic agents to be included in the antistatic coating film, and each type of the antistatic agent has respective merits and demerits. Accordingly, the low-molecular antistatic agent and the high-polymer antistatic agent are properly used according to the use of the product.
Known antistatic agents and their characteristics are described below.
Surfactant-type anionic antistatic agents such as a long-chain alkyl compound having a sulfonic acid salt group (Japanese Patent TOKKAIHEI 4-28728) are known as the low-molecular antistatic agent, and polymers having ionized nitrogen element on the main chain (Japanese Patents TOKKAIHEI 3-255139, 4-288217 and 6-172562) or a polystyrene modified with a sulfonic acid salt (Japanese Patent TOKKAIHEI 5-320390) are known as the high-polymer antistatic agent.
The use of a low-molecular antistatic agent may cause the migration of a part of the antistatic agent in the antistatic film through the coating film layer and the accumulation of the agent to the interface between the coating film and the base film and, for example in the case of winding the film in the form of a roll, produce a problem of the transfer of the antistatic agent to the reverse face of the antistatic film (back transfer) and the deterioration of the antistatic effect with time. As for the high-polymer antistatic agent, it is necessary to form a thick antistatic layer for getting sufficient antistatic effect to necessitate a large amount of the antistatic agent and increase the cost.
Another problem is the thermal deterioration of the coating film component in the reclaimed material during a film-forming process to give a considerably colored film unsuitable for practical use in the case of reclaiming a scrap film (for example, slit edge of the film in the production of an antistatic film) and using as a reclaimed material for the production of a film.
Furthermore, these antistatic agents cause various problems such as the tendency of blocking (a phenomenon to cause the adhesion of films in a hardly peelable state in the case of stacking films over a long period) and the readily peelable antistatic layer.
DISCLOSURE OF INVENTION
The first object of the present invention is to solve the problems o
REFERENCES:
patent: 4784896 (1988-11-01), Matsunaga et al.
patent: 5573996 (1996-11-01), Inoue
Mark et al., Encyclopedia of Polymer Science, vol. 1: Additives, pp. 472-475, Aug. 1985.
Fukuda Masayuki
Kitazawa Satoshi
Okada Shin-ichiro
Tomita Hiroshi
Teijin Ltd.
Thibodeau Paul
Zacharia Ramsey
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