Stripping fingers for copying machine

DETAILED DESCRIPTION OF THE INVENTION The above-described liquid crystal polyester is synthesized from different kinds of aromatic hydroxycarboxylic acids or their ester-forming derivatives or from an aromatic hydroxycarboxylic acid, aromatic dicarboxylic acid, aromatic diol or their ester-forming derivatives.
It has for example the following repeating structural units.
Repeating structural units derived from aromatic hydroxycarboxylic acid: ##STR1## Repeating structural units derived from aromatic dicarboxylic acid: ##STR2## Repeating structural units derived from aromatic diol: ##STR3## Liquid crystal polyesters having repeating structural units as shown by the following formulas (A), (B) and (C) are especially preferable as materials for stripping fingers in that they have good heat resistance, mechanical properties and moldability in a balanced manner.
##STR4## (In the formulas, n represents 0 or 1, the molar ratio (A):(B) is 1:1 to 10:1.
The molar ratio (B):(C) is 9:10 to 10:9.
Aromatic substituents in (B) and (C) are arranged in para- or meta-positions relative to one another.
) The titanium oxide whiskers used in this invention are rutile type white needle-like crystals expressed by the chemical formula TiO.
sub.
2 and having an average fiber diameter of 0.
05-.
mu.
m, preferably 0.
05-0.
5 .
mu.
m, and an average fiber length of 1-100 .
mu.
m, preferably 1-30 .
mu.
m.
Such titanium oxide whiskers may be formed-by any method, e.
g.
by well-known sulfuric and chloric methods.
E.
g.
FTL series manufactured by Ishihara Sangyo Co.
, Ltd.
may be used.
In order to further improve the reinforcing effect of the titanium oxide whiskers, it is effective to improve the wettability and bond strength between the titanium oxide whisker and the liquid polyester as the matrix by treating the surface of the whiskers with a coupling agent.
The coupling agent used for this purpose may be silicon, titanium, aluminum, zirconium, zirco aluminum, chromium, boron, phosphorus or amino acidic agent.
Titanium oxide whiskers should be added to the liquid crystal polyester in a ratio of 5-50%, preferably 10-40% weight with respect to the total amount of the liquid crystal polyester and the titanium oxide whiskers