Catalyst for polymerization of polyester, polyester and process for preparing polyester

Abstract

The invention provides a polyester, preparation method thereof and polyester polymeric catalyst, wherein the polyester is prepared by polymeric catalysts using metal components expert for antimony and germanium as main metal components of the catalysts, capable of improving the block of filters during the formation, and selected from the group consisting of at least one of alkaline metals and compounds thereof and alkaline-earth metals and compounds thereof and the group consisting of at least one of aluminium and compounds thereof with the amounts making them meet with the followings formulas (1) and (2) that M is less than 0.05, and (2) M / Al is less than 20, where M represents the mol% in total of the alkaline metal atoms and alkaline-earth metal atoms in the polyester corresponding to the acid components, and Al represents the mol% of the aluminium atom in the polyester corresponding to the acid components. The polyester can be used for fibres, films, hollow moulds and the like.

Description

[0001] This application is a divisional application of 02803810.X (International Application No.: PCT / JP02 / 00266). The filing date of the original application was January 17, 2002. The invention name of the original application is polyester polymerization catalyst, polyester and polyester Method for the preparation of esters. technical field [0002] The present invention relates to a polyester polymerization catalyst, a polyester, and a method for producing polyester, and more particularly, to a polyester polymerization catalyst, polyester, and a method for producing polyester that can improve filter clogging during molding, etc. . Background technique [0003] Polyester, especially polyethylene terephthalate (hereinafter referred to as PET), has excellent mechanical and chemical properties and is used in various applications, for example, it can be applied to clothing, fibers for industrial resources, and packaging Formed products of various films or sheets, bottles or en...

AI Technical Summary

Problems solved by technology

Antimony trioxide is an inexpensive catalyst with excellent catalytic activity, but there is a problem of black ink or impurities in PET due to the precipitation of antimony metal during polycondensation

In addition, when used as a raw material for hollow molded products, etc., it is difficult to obtain hollow molded products with good transparency.

[0007] (2) Impurities in the polyester used for fiber will reduce the strength in the fiber, causing cover contamination during silk making or increase in filter pressure of the filter

Among them, chelates of aluminum such as aluminum acetylacetate are generally expensive, and the aluminum content in the compound is low, so it will cause the problem of high cost or the problem of low solubility in solvents such as ethylene glycol, which limits the problem of adding methods.

Aluminum hydroxide or aluminum alkoxide, which has the problem of low solubility into the system and thus low catalytic activity or the problem of producing insoluble impurities in the polyester

Chlorine-containing inorganic acid salts such as aluminum chloride have relatively excellent catalytic activity, but they have a problem of high corrosion to equipment or a large coloring of the obtained polymer.

[0019] On the other hand, examples of aluminum salts of carboxylic acids include aluminum acetate, basic aluminum acetate, aluminum lactate, and aluminum benzoate. These are generally inexpensive and have low corrosion resistance to equipment. However, due to their solubility in polyester Low, so it has an impact on catalytic activity, and at the same time, there is a problem of turbidity in the obtained polyester, and there are problems in using it as a catalyst

For example, it is disclosed in JP-A-10-324741 that the polyester using aluminum acetate as a catalyst has the problem that insoluble impurities are easily formed and the spinning property is poor.

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