Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1998-11-06
2000-12-05
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528272, 528274, 528279, 528280, 528308, 5283086, 524714, 524724, 524767, 524777, 502102, 502111, 502117, 502132, 502164, 502170, 502172, C08G 6378, B01J 3100
Patent
active
061568678
DESCRIPTION:
BRIEF SUMMARY
A polyester polymerization catalyst, a production method thereof, and a polyester production method using said catalyst
TECHNICAL FIELD
The present invention relates to a polyester polymerization catalyst, a production method thereof, and a polyester production method using said catalyst. In more detail, the present invention relates to an polyester polymerization catalyst for producing a polyester excellent in pocesssability and color tone, a production method thereof, and a polyester production method using said catalyst.
BACKGROUND ART
Polyesters are used widely in various fields for fibers, films, resins and bottles because of their excellent properties. Among them, polyethylene terephthalate is favorably used since it is excellent in mechanical strength, chemical properties, dimensional stability, etc.
In general, polyethylene terephthalate is produced from terephthalic acid or any of its ester forming derivatives and ethylene glycol. In this case, in commercial processes for producing high molecular polymers, antimony compounds are widely used as polycondensation catalysts. However, polymers containing any antimony compound have the following several unpreferable properties.
For example, when a polyester obtained by using an antimony catalyst is melt-spun into fibers, it is known that the residue of the antimony catalyst is deposited around the holes of a spinneret. The reason why the residue of the antimony catalyst is deposited is considered to be that antimony exists as antimony glycolate in the polymer and that it is modified near the spinneret, and partially vaporized and dissipated, while a component mainly composed of antimony remains at the spinneret. If the deposit grows, it causes filament breaking, etc. and must be removed from time to time.
Furthermore, the antimony catalyst residue in the polymer is likely to be relatively large grains, and acts as a foreign matter, causing such unpreferable phenomena as filtration pressure rise at the time of processing, filament breaking at the time of spinning, and film breaking at the time of film formation.
Because of the above problems, a polyester having very small or zero in antimony content is being demanded.
To solve the problems, U.S. Pat. No. 5,512,340 and U.S. Pat. No. 5,596,069 propose to use an aluminum compound such as aluminum chloride or aluminum hydroxychloride and a cobalt compound together. However, in general, an aluminum compound has such problems that it is unlikely to be dissolved in a glycol such as ethylene glycol and the polyester reaction system, and if it is added to the polyester reaction system as a polycondensation catalyst, an insoluble foreign matter is formed to cause filament breaking at the time of spinning and film breaking. After all, the problems of antimony cannot be sufficiently avoided.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a polyester polymerization catalyst for producing a polyester, which overcomes the disadvantages of the polyester containing said antimony compound and the disadvantages caused when an aluminum compound is used as a polymerization catalyst, and also to provide a production method thereof and a polyester production method using said catalyst.
The present invention relates to a polyester polymerization catalyst, comprising a solution containing an aluminum compound and an alkali compound, with water or an organic solvent or a mixture consisting of water and an organic solvent as the medium, and also relates to a production method thereof and a polyester production method using said catalyst.
THE MOST PREFERRED EMBODIMENTS OF THE INVENTION
The polyester of the present invention is a polymer synthesized from a dicarboxylic acid or any of its ester forming derivatives and a diol, and is not especially limited as far as it can be used as such products as fibers, films and bottles.
The dicarboxylic acids which can be used here include, for example, dicarboxylic acids such as terephthalic acid, naphthalenedicarboxylic acid, adipic acid, isophthalic
REFERENCES:
patent: 3528945 (1970-09-01), Stewart et al.
patent: 3528946 (1970-09-01), Stewart et al.
patent: 3533973 (1970-10-01), Stewart et al.
patent: 4565845 (1986-01-01), Inoue et al.
patent: 5391700 (1995-02-01), Itoh et al.
patent: 5512340 (1996-04-01), Goodley
patent: 5596069 (1997-01-01), Goodley
patent: 5693786 (1997-12-01), Tanaka et al.
patent: 5719214 (1998-02-01), Tanaka et al.
Aoyama Masatoshi
Tsutsumi Kenichi
Uchida Minoru
Acquah Samuel A.
Miller Austin R.
Toray Industries Inc.
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