Claims
- 1. An aromatic polyester composition comprising:(A) (a) an ethylene naphthalenedicarboxylate copolymer which contains an ethylene naphthalenedicarboxylate unit in an amount of 94 to 80 mol % based on the total of all the recurring units and an ethylene terephthalate units and/or an ethylene isophthalate unit in an amount of 6 to 20 mol % based on the total of all the recurring units and a diethylene glycol unit in an amount of 0.8 to 2.5 wt % and which has a number of terminal carboxyl groups of 40 eq/106 g or less and a total number of terminal groups of 95 eq/106 g or more, and (b) an ethylene terephthalate (co)polymer which contains an ethylene terephthalate unit in an amount of 100 to 80 mol % based on the total of all the recurring units and an ethylene naphthalenedicarboxylate unit and/or an ethylene isophthalate unit in an amount of 0 to 20 mol % based on the total of all the recurring units and a diethylene glycol unit in an amount of 1.2 to 2.4 wt % and which has a number of terminal carboxyl groups of 30 eq/106 g or less, an intrinsic viscosity of 0.7 or more and a melting temperature of 250° C. or less, the contents of the ethylene naphthalenedicarboxylate copolymer and the ethylene terephthalate (co)polymer being 5 to 95 wt % and 95 to 5 wt % based on the total weight of these, respectively; (B) compatibility between the ethylene naphthalenedicarboxylate copolymer and the ethylene terephthalate (co)polymer being 0.15 to 0.5; and (C) the relationship represented by the following expression (1) being satisfied when the proportion of the ethylene naphthalenedicarboxylate unit to the total of all the recurring units of the ethylene naphthalenedicarboxylate copolymer and all the recurring units of the ethylene terephthalate (co)polymer is 50 mol % or less: Tm≦254−28×EN (1)wherein EN is the molar fraction of the ethylene naphthalenedicarboxylate unit in the polyester composition and Tm is the melting point (° C.) of the polyester composition, and the relationship represented by the following expression (2) being satisfied when the proportion of the ethylene naphthalenedicarboxylate unit to the total of all the recurring units of the ethylene naphthalenedicarboxylate copolymer and all the recurring units of the ethylene terephthalate (co)polymer is more than 50 mol %: Tm≦267−54×EN (2) wherein Tm and EN are the same as defined in the above expression (1).
- 2. The aromatic polyester composition of claim 1, wherein the contents of the ethylene naphthalenedicarboxylate copolymer and the ethylene terephthalate (co)polymer are 5 to 50 wt % and 95 to 50 wt % based on the total weight of these, respectively.
- 3. The aromatic polyester composition of claim 1, wherein the ethylene naphthalenedicarboxylate copolymer contains acetaldehyde in an amount of as much as 20 ppm.
- 4. The aromatic polyester composition of claim 1, wherein the ethylene terephthalate (co)polymer contains antimony and/or germanium in an amount of 40 to 250 ppm.
- 5. The aromatic polyester composition of claim 1, wherein the ethylene terephthalate (co)polymer contains acetaldehyde in an amount of as much as 3 ppm.
- 6. The aromatic polyester composition of claim 1, wherein the ethylene terephthalate (co)polymer has a crystallinity of 60% or less.
- 7. The aromatic polyester composition of claim 1, wherein the compatibility is 0.2 to 0.4.
- 8. The aromatic polyester composition of claim 1, which contains at least one of either antimony or germanium and phosphorus and satisfies the relationships represented by the following expressions (3) and (4):53≦1/2Sb+Ge≦150 (3) 25≦P≦70 (4) wherein each elemental symbol represents the content (ppm) of each element in the polyester composition.
- 9. The aromatic polyester composition of claim 1 which has a haze value of 3% or less.
- 10. A molded product of the aromatic polyester composition of claim 1.
- 11. The molded product of claim 10 which is a preform.
- 12. The molded product of claim 10 which is a film or sheet.
Priority Claims (2)
Number |
Date |
Country |
Kind |
10-180615 |
Jun 1998 |
JP |
|
10-230623 |
Aug 1998 |
JP |
|
Parent Case Info
This is a divisional of application Ser. No. 09/486,276 filed Feb. 25, 2000, and now U.S. Pat. No. 6,500,506, which is a National Stage Application under 37 C.F.R. §371 of PCT/JP99/03416 filed Jun. 25, 1999, the disclosures of all of which are incorporated herein by reference.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
5837800 |
Suzuki et al. |
Nov 1998 |
A |
5888598 |
Brewster et al. |
Mar 1999 |
A |
Foreign Referenced Citations (8)
Number |
Date |
Country |
0 926 197 |
Jun 1999 |
EP |
8-34910 |
Feb 1996 |
JP |
10-86212 |
Apr 1998 |
JP |
10-95903 |
Apr 1998 |
JP |
11-20009 |
Jan 1999 |
JP |
11-43589 |
Feb 1999 |
JP |
11-43592 |
Feb 1999 |
JP |
11-130947 |
May 1999 |
JP |
Non-Patent Literature Citations (4)
Entry |
Patent Abstracts of Japan, JP 09208711, dated Aug. 12, 1997. |
Patent Abstracts of Japan, JP 11043588, dated Feb. 16, 1999. |
Patent Abstracts of Japan, JP 11043589, dated Feb. 16, 1999. |
Patent Abstracts of Japan, JP 11043592, dated Feb. 16, 1999. |