| 摘要 |
A linear rodlike polyester of controlled rigidity and packing density which melts below 350 DEG C and consists essentially of recurring units of the formula (1) <CHEM> in which A, B, C and D are the same or different cyclic moieties selected from the group consisting of 1,4-phenylene and 1,4-cyclohexylene; n is Zero or 1; Z<1>, Z<2> and Z<3> are the same or different and are selected from the group of bivalent links consisting of the covalent bond (-) and of linkages -COO-, -OOC-, -CH2CH2-, -CH2O-, -OCH2-, -OCH2CH2O-, -OCH2OCH2- and -CH2OCH2O-; X<1>, X<2>, X<3> and X<4> are the same or different and are selected from the group consisting of aliphatic substituents consisting of 2 to 8 carbon atoms in a straight or branched chain in which one, two or three of said carbon atoms may be replaced by oxygen atoms such that any said oxygen atom is directly attached to two of said carbon atoms of said chain; r, s, t and u are selected from the group consisting of Zero and integers of 1 to 4; certain provisos must be observed to achieve optimum properties.
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