Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1993-09-22
2000-09-26
Seidleck, James J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428327, 428328, 428330, 428331, 428480, 524430, B32B 516
Patent
active
061240311
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a thermoplastic polyester composition and films made therefrom, and more particularly, relates to a thermoplastic polyester composition suitable for obtaining formed bodies (films or fibers) excellent in slipping property, abrasion resistance and scratch resistance (property hardly causing scratches) by uniformly dispersing fine aluminum oxide particles having specified crystal structures in the thermoplastic polyester composition.
BACKGROUND ART OF THE INVENTION
Generally, a thermoplastic polyester, for example, polyethylene terephthalate, has excellent mechanical properties, and is broadly used for a formed product of a film, a fiber, etc.
Usually, in the polyester, inert particles are contained in the polyester and thereby form protrusions on the back surface of a formed product for the purpose of giving a slipping property to the formed product. Although there are various kinds of particles as such inert particles, there is a problem that generally inert particles are poor in affinity with polyester and in abrasion resistance.
To solve this problem, investigations with respect to surface treatment have been carried out. For example, JP-A-SHO 63-221158 and JP-A-SHO 63-280763 propose to improve the surfaces of colloidal silica particles by a glycol group, JP-A-SHO 63-312345 proposes to improve the surfaces of colloidal silica particles by a coupling agent, and JP-A-SHO 62-235353 proposes a surface treatment of calcium carbonate particles by a phosphorus compound.
However, even if such conventional methods are applied, in a case of use with a contact running and friction such as a magnetic tape, particles are likely to fall off. Therefore, use of particular particles is recently proposed. Specifically, it is proposed that aluminum oxide particles have a great advantage for increase of abrasion resistance, for example, in JP-A-HEI 2-129230 (delta-type aluminum oxide particles) and in JP-A-HEI 2-38444 (aluminum oxide particles).
However, even if such methods are applied, when a film is brought into contact with a guide pin and repeatedly runs at a high speed, the abrasion resistance and the scratch resistance thereof are insufficient.
The inventors of the present invention have found that the abrasion resistance and scratch resistance of a polyester film depend upon the kind of particles present in the polyester film, and have reached the present invention as the result of earnest investigation.
An object of the present invention is to solve the above-mentioned disadvantages in the conventional technologies, and to provide a thermoplastic polyester composition excellent in all of slipping property, abrasion resistance and scratch resistance, particularly a thermoplastic polyester composition from which films and fibers excellent in abrasion resistance in repeated high-speed running can be made.
DISCLOSURE OF THE INVENTION
The object of the present invention is accomplished by the following constitution.
A thermoplastic polyester composition characterized in that the composition comprises a thermoplastic polyester (A) prepared from an acid component mainly comprising an aromatic dicarboxylic acid and a glycol component mainly comprising an aliphatic glycol and .theta.-type aluminum oxide particles (B); or comprises a thermoplastic polyester (A) prepared from an acid component mainly comprising an aromatic dicarboxylic acid and a mixture (C) of two or more kinds of aluminum oxide particles different from each other in crystal structure.
The aluminum oxide particles used in the present invention are .theta.-type aluminum oxide particles (B), or a mixture (C) of two or more kinds of aluminum oxide particles different from each other in crystal structure.
The mixture (C) of two or more kinds of aluminum oxide particles different from each other in crystal structure means a mixture of .alpha.-type aluminum oxide particles well known, .gamma.-type, .delta.-type, .eta.-type, .theta.-type, .kappa.-type and .chi.-type activated aluminum oxide pa
REFERENCES:
patent: 5252388 (1993-10-01), Murooka et al.
Aoyama Masatoshi
Sasaki Toshihiro
Suzuki Masaru
Ueda Toshiaki
Yoshida Minoru
Miller Austin R.
Rajguru U. K.
Seidleck James J.
Toray Industries Inc.
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