Claims
- 1. A melt-processable copolyester consisting essentially of
- a structural unit (I) of formula (1--1) ##STR9## and formula (1--2) ##STR10## wherein the amount of the species of formula (1--2) is 5 to 95 mole% of the structural unit (I),
- a structural unit (II) of formula (2)
- --O--X--O-- (2)
- wherein X is at least one selected from the group consisting of ##STR11## and a structural unit (III) of formula (3)
- --O--Y--CO-- (3)
- wherein Y is at least one selected from the group consisting of ##STR12## the proportion of the structural unit (III) being 10 to 80 mole% of the structural units (I)+(II)+(III) in total, the structural unit (I) being substantially equimolar to the structural unit (II), the inherent viscosity (1n .eta..sub.rel)/C, measured in a concentration of 0.16 g/dl in pentafluorophenol at 60.degree. C., being not less than 0.5 dl/g.
- 2. A copolyester according to Claim 1 wherein the amount of the species of the formula (1--2) is 20 to 80 mole % of the structural unit (I).
- 3. A copolyester according to claim 1 wherein the inherent viscosity is not more than 10.0.
- 4. A copolyester according to claim 1 wherein the proportion of the structural unit (III) is 40 to 80 mole % of the structural units (I)+(II)+(III) in total.
- 5. A copolyester according to claim 1 wherein X in the formula (2) for the structural unit (II) is ##STR13## and Y in the formula (3) for the structural unit (III) is ##STR14##
- 6. A copolyester according to claim 1 wherein X in the formula (2) for the structural unit (II) is ##STR15## and Y in the formula (3) for the structural unit (III) is ##STR16## or a mixture of ##STR17##
- 7. A copolyester according to claim 1 wherein X in the formula (2) for the structural unit (II) represents at least one selected from the group consisting of ##STR18## and Y in the formula (3) for the structural unit (III) represents at least one selected from the group consisting of ##STR19##
Priority Claims (3)
Number |
Date |
Country |
Kind |
62-199084 |
Aug 1987 |
JPX |
|
63-61872 |
Mar 1988 |
JPX |
|
63-61873 |
Mar 1988 |
JPX |
|
Parent Case Info
This application is a continuation-in-part of now abandoned application Ser. No. 228,312 filed Aug. 4, 1988.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3873504 |
Boettcher et al. |
Mar 1975 |
|
4238598 |
Favstritsky |
Dec 1980 |
|
4238599 |
Langley et al. |
Dec 1980 |
|
4346208 |
Fayolle |
Aug 1982 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
228312 |
Aug 1988 |
|