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Wholly aromatic polyester
| Details |
Inventors: Matsumoto, Mitsuo; Kaneda, Teruhisa;
Assignee: Kuraray Company, Ltd. (Kurashiki, JP)
Primary Examiner: Jacobs; Lewis T.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland & Maier
A molded product prepared by injection molding a wholly aromatic thermotropic liquid crystal polyester consisting of 4-oxybenzoil moiety, terephthaloyl moiety and 4,4'-dioxydiphenyl ether moiety is characterized in high impact strength, small mechanical anisotropy and excellent resistance to heat. The thermotropic liquid crystal polyester gives, by blending therewith a known thermotropic liquid crystal polyester, a composition which can yield a formed product having a superior strength and a relatively small elastic modulus. |
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DETAILED DESCRIPTION A wholly aromatic polyester according to the present invention is the one consisting essentially of recurring units I, II and III: ##STR1## wherein the unit I is contained in the range from 45 to 68 mol %, the unit II is contained in the range from 16 to 27.
5 mol %, the unit III is contained in the range from 16 to 27.
5 mol %, and the unit II and the unit III exist in substantially the same molar amounts; having an inherent viscosity, when determined in pentafluorophenol solution with a concentration of 0.
1 wt.
/vol % and at 60.
degree.
C.
, of 0.
5 dl/g or higher; and forming an optically anisotropic melt phase at a temperature below 350.
degree.
C.
Another object of this invention is to provide a molded product being of a small anisotropy in mechanical properties and being excellent in impact strength.
Still another object of this invention is to provide a polymer composition obtained by melt-blending the wholly aromatic polyester consisting of recurring units I, II and III in the above specified contents (denoted as (X)) with an aromatic polyester excluding (X) melt-formable at a temperature below 450.
degree.
C.
(denoted as (Y)) in a weight ratio from 90:10 to 10:90, wherein (Y) should satisfy a condition as follows: When test specimens of the same shape are obtained by injection molding (X) and (Y) separately, the flexural strength and the flexural modulus of the test specimen obtained from (Y) are at least 10% higher than those of the test specimen obtained from (X) respectively.
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Optical Systems 
