Polyethylene naphthalenedicarboxylate resin composition
AssigneeTeijin Limited
InventorsYoichi Yoshida, Minoru Suzuki, Hiroki Nagano
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Abstract
Provided is a polyethylene naphthalenedicarboxylate resin composition having excellent transparency and hue, and containing a cobalt compound as a color-controlling agent, wherein the polyethylene naphthalenedicarboxylate resin composition comprises a polyethylene naphthalenedicarboxylate, an antimony compound, a cobalt compound and a phosphorous compound which is expressed by a specific structural formula and has an acid dissociation constant pKa of 1.0 or more, and the polyethylene naphthalenedicarboxylate resin composition is produced by using an antimony compound as a polycondensation catalyst.
Claims10
A polyethylene naphthalenedicarboxylate resin composition comprising a polyethylene naphthalenedicarboxylate, an antimony compound, a cobalt compound and a phosphorus compound, wherein:
- the phosphorus compound has an acid dissociation constant pKa of not less than 1.0 and the phosphorus compound is either phosphorous acid or a compound represented by the following Formula 1:
- wherein n is 0, 1, or 2;
- the content of the antimony compound is from 5 to 40 mmol % in terms of antimony trioxide based on the total dicarboxylic acid components constituting the polyethylene naphthalenedicarboxylate;
- the content of the cobalt compound is from 3 to 35 mmol % based on the total dicarboxylic acid components constituting the polyethylene naphthalenedicarboxylate;
- the molar ratio of the contents of the antimony compound and the cobalt compound is in the range of cobalt element/antimony element=0.1 to 1.0;
- and
- the polyethylene naphthalenedicarboxylate is produced by either an ester exchange reaction or a direct esterification reaction;
- provided that when the polyethylene naphthalenedicarboxylate is produced by an ester exchange reaction, the content of the phosphorus compound is from 0.7 to 2.0 times by mol based on the content of the ester exchange reaction catalyst used for the production of the polyethylene naphthalene dicarboxylate,
- and when the polyethylene naphthalenedicarboxylate is produced by a direct esterification reaction, the content of the phosphorus compound is from 5 to 100 mmol % based on the total dicarboxylic acid components used for the production of the polyethylene naphthalenedicarboxylate.
A polyethylene naphthalenedicarboxylate resin composition comprising a polyethylene naphthalenedicarboxylate, an antimony compound, a cobalt compound and a phosphorus compound, wherein:
- the polyethylene naphthalenedicarboxylate simultaneously satisfies the following conditions (1) to (3):
- (1) the content of carboxyl terminal group is 32 eq/T (106 g) or less, (2) the content of acetaldehyde is 500 ppm or less, and (3) the content of diethylene glycol component is from 0.4 to 3.0% by weight;
- the phosphorus compound has an acid dissociation constant pKa of not less than 1.0 and the phosphorus compound is either phosphorous acid or a compound represented by the following Formula 1:
- wherein n is 0, 1, or 2;
- the content of the antimony compound is from 5 to 40 mmol % in terms of antimony trioxide based on the total dicarboxylic acid components constituting the polyethylene naphthalenedicarboxylate;
- the content of the cobalt compound is from 3 to 35 mmol % based on the total dicarboxylic acid components constituting the polyethylene naphthalenedicarboxylate;
- the molar ratio of the contents of the antimony compound and the cobalt compound is in the range of cobalt element/antimony element=0.1 to 1.0;
- and
- the polyethylene naphthalenedicarboxylate is produced by either an ester exchange reaction or a direct esterification reaction;
- provided that when the polyethylene naphthalenedicarboxylate is produced by an ester exchange reaction, the content of the phosphorus compound is from 0.7 to 2.0 times by mol based on the content of the ester exchange reaction catalyst used for the production of the polyethylene naphthalene dicarboxylate,
- and when the polyethylene naphthalenedicarboxylate is produced by a direct esterification reaction, the content of the phosphorus compound is from 5 to 100 mmol % based on the total dicarboxylic acid components used for the production of the polyethylene naphthalenedicarboxylate.
Dependencies are inferred from the claim text.